The percent decrease in screen time this week is 40%. Therefore, option C is the correct answer.
Given that, last week, Lora used 840 minutes. This week, Lora used 504 screen time minutes on the phone.
What is percentage?Percentage is defined as a given part or amount in every hundred. It is a fraction with 100 as the denominator and is represented by the symbol "%".
Now,
Difference=840-504
= 336
Percentage decrease = Difference in value/Original value ×100
= 336/840 ×100
= 0.4 ×100
= 40%
The percent decrease in screen time this week is 40%. Therefore, option C is the correct answer.
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Why is Mathematics called the queen of science (1 paragraph response please)
a store increased the original price of a shirt by a certain percent and then decreased the new price by the same amount. given that the resulting price was 84% of the original price, by what percent was the price increased and decreased?
A retailer raised a shirt's original price by a certain percentage before lowering it by the same percentage. The price was increased and decreased by 40% as the final cost was 84% of the initial cost.
What is percent?In essence, percentages are fractions with a 100 as the denominator. We place the percent symbol (%) next to the number to indicate that the number is a percentage. For instance, you would have received a 75% grade if you answered 75 out of 100 questions correctly on a test (75/100). A number or ratio that can be expressed as a fraction of 100 is referred to as a percentage in mathematics. If we need to calculate a percentage of a number, we should divide it by its entirety and then multiply it by 100. The percentage therefore refers to a part per hundred. Per 100 is what the word percent means. The letter "%" stands for it.
Here,
Let's say the shirt originally cost Rs 100, and we're adding t% to the price.
The new price of the shirt is therefore 100 + (t/100 * 100) = Rs. 100+t after the initial t% increase.
The price is then reduced by t%.
Cost of a new shirt: (100 + t) - (t/100)
[100+t] = (100+t)
[1-(t/100] = [(100+t)/100]
therefore, the final price is equal to 84% of Rs 100, or Rs 84.
10000 - t^2 = 84.
t^2 = 1600
t = 40
The price was thus raised and lowered by 40%.
The original price of a shirt was increased by a specific percentage before being decreased by the same percentage by the retailer. As the final price was 84% of the initial price, the price was both increased and decreased by 40%.
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y = -6x - 2
12x + 2y = −6
Tanisha and her children went into a restaurant that sells hamburgers for
$7.50 each and drinks for $1.75 each. Tanisha has $70 to spend and must buy
no less than 18 hamburgers and drinks altogether. If a represents the number
of hamburgers purchased and y represents the number of drinks purchased,
write and solve a system of inequalities graphically and determine one
possible solution.
Marcus and jeremy both evaluated the expression −52 3. marcus said the answer was −22. jeremy said the answer was 28. who is correct? explain the error in the other student’s work.
Marcus is accurate. Jeremy is wrong because he overlooked the negative sign in the equation's initial addend. Since -25 has a greater absolute value than 3, it is obvious that the sum should be negative.
Marcus is correct; the solution is -22.
The simplified expression is given as:
= -(5²)+ 3
= -(25) + 3
= - 22
The right response is this. Marcus saw the bracket or parentheses symbol when he condensed his sentence. This has major significance.
Jeremy scored 28. He squared -5 without noting that it was in a bracket or parenthesis, therefore his response is incorrect.
Consequently, Jeremy calculated this.
= -(5²) + 3
= 25 + 3
= 28
Jeremy gave a false response. He made a computation but failed to see the bracket.
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Complete Question
Marcus and Jeremy both evaluated the expression −(5²) + 3. Marcus said the answer was −22. Jeremy said the answer was 28. Who is correct? Explain the error in the other student’s work.
Eva says
3
4
is equivalent to
15
20
. Check her work by completing the table of equivalent ratios.
The equivalent ratio table is:
3 4
6 8
9 12
12 16
15 20
What is a Ratio?A ratio indicates the number of times one number contains another.
To find the equivalent ratio of 3/4 write the table of 3 in one column of the table and write the table of 4 in another column of the table.
The equivalent ratio table is:
3 4
6 8
9 12
12 16
15 20
The above table indicates that 3/4 = 6/8 = 9/12 = 12/16 = 15/20.
Therefore, from the table, 3/4 is equivalent to 15/20.
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which contours are usually drawn darker than the other contours? group of answer choices index contours largest (max) value contour contour interval smallest (min) value contour
Index contours are usually drawn darker than the other contours.
Index Contours are darker and wider than the other regular contour lines for ease of identification. They are labeled with elevation and also have their altitude value mentioned on the dark lines and these values represent the altitudes of the particular contours. Index contours appears after every fifth contours. If the number with contours will increase then its elevation will also increase and similarly if the number associated with contours starts to decrease then its elevation also decreases.
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Which expression is equal to 6(r2 – 3) + 2(r2 + 1)?
8r squared - 20
6r squared -2
8r squared -16
6r squared +2r-16
pls, help 20 points!
Answer:8r squared -16
Step-by-step explanation:
what two numbers add to "-5" and multiply to "-4"
The numbers that add to -5 and multiply to -4 are -5.7015 and 0.7015.
There are two numbers. The addition of the two numbers is -5. The multiplication of the two numbers is -4. We need to find the two numbers. Let the first number and the second number be represented by the variables x and y, respectively. Then, we can write the two following equations.
x + y = -5
x*y = -4
We will substitute the value of y from the first equation into the second equation.
x*(-5 - x) = -4
x*(x + 5) = 4
x² + 5x - 4 = 0
Now, we will use the quadratic formula.
x = [-5 ± √(5² - 4(1)(-4))]/2(1)
x = [-5 ± √(25 + 16)]/2
x = [-5 ± √41]/2
x = [-5 ± 6.403]/2
The values of x are -5.7015 and 0.7015. The corresponding values of y are 0.7015 and -5.705.
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Six trigonometric functions of the angle (20,21)
The exact values of the six trigonometric functions for the point (x, y) = (20, 21) are listed below:
sin θ = 21 / 29, cos θ = 20 / 29, tan θ = 21 / 20, cot θ = 20 / 21, sec θ = 29 / 20, csc θ = 29 / 21
How to determine the exact six trigonometric functions related to a point in rectangular format
Points in rectangular format are points of the form (x, y), where x and y represent the position of the point respect to the origin and along the respective orthogonal axis.
The line segment between the origin and that point represents the hypotenuse of a right triangle. Then, we can determine the six trigonometric functions by using the following formulae:
sin θ = y / √(x² + y²)
cos θ = x / √(x² + y²)
tan θ = y / x
cot θ = x / y
sec θ = √(x² + y²) / x
csc θ = √(x² + y²) / y
If we know that x = 20 and y = 21, then the exact values of the trigonometric functions are:
sin θ = 21 / √(20² + 21²)
sin θ = 21 / 29
cos θ = 20 / √(20² + 21²)
cos θ = 20 / 29
tan θ = 21 / 20
cot θ = 20 / 21
sec θ = √(20² + 21²) / 20
sec θ = 29 / 20
csc θ = √(20² + 21²) / 21
csc θ = 29 / 21
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Jade's Gem Shop is having its annual spring sale, when every item in the store gets marked down. During the sale, charm bracelets sell for $4 less than full price. Kristen purchases 5 identical charm bracelets: one for each of her friends. She pays a total of $45. Which equation can Kristen use to find how much money, c, each charm bracelet costs at full price?
Answer:
5(c−4)=45
5c - 20 = 45
5c = 45+20
5c = 65
c = 13
The full price of the bracelets was $13.
Step-by-step explanation:
a marathon is a 26.2-mile race that commemorates the run made by a greek soldier, pheidippides, that took place in 490 bce. how many kilometers did he run? (note: 1 mi
He ran 42.1 kilometers.
Define conversion.A conversion factor is a number that is used to multiply or divide one set of units into another. If a conversion is required, it must be done using the correct conversion factor to get an identical value. For instance, 12 inches equals one foot when converting between inches and feet. The act or process of transforming something into a different condition or form is known as conversion. to convert a value or expression between two different forms. • Measurement: converting between different units, for as from inches to millimeters or liters to gallons. For instance, change 12 inches to millimeters. 304.8 millimeters are equal to 12 inches multiplied by the inch-to-millimeter ratio of 25.4.
Given,
A marathon is a 26.2-mile race that commemorates the run made by a greek soldier, pheidippides, that took place in 490 bce.
1 mile = 1.609
Converting miles into kilometer:
26.2 miles
= 26.2 × 1.609
= 42.1
He ran 42.1 kilometers.
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Indicate the distance of the segment using the given
information. Round to the nearest tenth.
5. Find AX. A(-4, 5), X (1, −2)
The distance of segment AX sis found to be 8.6 units using the distance formula.
What exactly is the distance formula?[tex]\sqrt{[x_{2}-x_{1}]^{2} + [y_{2}-y_{1}]^{2} }[/tex] is the distance formula. This works for any two points in two-dimensional space with coordinates (x₁, y₁) for the first and (x₂, y₂) for the second. You may easily remember it if you remember that it is Pythagoras' theorem, that the distance is the hypothenuse, and that the coordinate lengths are the difference between the x and y components of the points.Why do we employ the distance formula?In complex numbers, the distance formula is used to express the plane and its magnitude. Furthermore, distance formulae can be used to calculate the distance between two planes in three-dimensional or n-dimensional planes. It is also used to calculate the magnitude formula.Given: A(-4, 5), X (1, −2)
We need to find the distance of the segment AX.
Distance of AX is given as :
[tex]\sqrt{[1-(-4)]^{2} + [-2-5]^{2} } \\= \sqrt{25 + 49}\\ = \sqrt{74}\\ =8.6[/tex]
Therefore, the distance of segment AX sis found to be 8.6 units using the distance formula.
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Me ayudan porfavor 2 trinomios cuya diferencia sea 4x²-7x+5
Answer:
Δ = b² - 4ac
Step-by-step explanation:
do math
I NEED HELP PLEASE DUE TODAY
Look at the picture for the problem
Please answer both parts
part a and b
a. The equation that represents the given data is y = 700x + 2,000.
b. The average daily attendance at Disneyland on its 80th anniversary is 58,000.
We are given the data about average daily attendance at Disneyland's anniversary celebrations. At Disneyland's 40th anniversary, the average daily attendance was 30,000 people. On the 60th anniversary, the average daily attendance was 44,000 people. We need to create an equation that would represent y, the average daily attendance, based on x, the number of years after Disneyland opened.
We can write the data in the form of points on the coordinate axes. The coordinates of the points are (40, 30,000) and (60, 44,000). We can use the two-point form to write an equation.
(y - y1) = [(y2 - y1)/(x2 - x1)]*(x - x1)
(y - 30,000) = [(44,000 - 30,000)/(60 - 40)]*(x - 40)
(y - 30,000) = [(14,000)/(20)]*(x - 40)
(y - 30,000) = (700)*(x - 40)
y = 700x - 28,000 + 30,000
y = 700x + 2,000
Now, we need to find out the average daily attendance at Disneyland on its 80th anniversary.
y = 700*80 + 2,000
y = 56,000 + 2,000
y = 58,000
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how many different 3-digit numbers can be formed using the digits 1, 2, 3, 4, 5, and 6? repeated digits are allowed.
There will be 216 different 3-digit numbers can be formed using the digits 1, 2, 3, 4, 5, and 6 when repeated digits are allowed by fundamental counting principle.
What is fundamental counting principle?A rule used to count the entire number of alternative outcomes in a circumstance is known as the fundamental counting principle. It asserts that if there are n ways to do something and then m ways to do something else, then there are nm methods to do both of these acts. The Fundamental Principle of Counting assists in determining how selection is made based on available options. The Fundamental Principle of Counting simplifies the approach to selection by taking into account all of the possible choices and their combinations in order to calculate the Probability.
Here,
Since there are 6 digit given,
In first place, there are 6 ways to arrange the digits. In second place, there are 6 ways to arrange the digits. In third place, there are 6 ways to arrange the digits.
This way,
6×6×6=216 ways
When repeated digits are allowed by the fundamental counting principle, 216 different 3-digit numbers can be formed using the digits 1, 2, 3, 4, 5, and 6.
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2. Communicate and Justify Why is the algebraic
expression x, equivalent to x ¹?
Expression x is equivalent to [tex]x^{1}[/tex] by using the exponent rule.
What do you mean by algebraic expression?
A mathematical expression that includes variables, constants, and algebraic operations is known as an algebraic expression (addition, subtraction, etc.). Terms comprise expressions.
There are three primary categories of algebraic expressions, including:
Monomial expression
Binomial expression
Polynomial expression
An algebraic expression can be divided into two additional types in addition to the monomial, binomial, and polynomial types. These are:
Numeric Expression
Variable Expression
Numeric expression - A numeric expression consists of numbers and operations, but never include any variable.
Variable expression - A variable expression is an expression that contains variables along with numbers and operation to define an expression.
As we know, exponent form [tex]x^{n}[/tex] can be simplified as [tex]x \times x\times x\times ........n~ times[/tex]
In this way , [tex]x^{1}[/tex]can be written as x multiplied by 1 time which is equal to x
Therefore, expression x is equivalent to [tex]x^{1}[/tex].
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Plssss helpppp
Graduation rate is one measure used to compare
colleges in national publications. One such publication
compared semester tuition against graduation rate,
defined as the percentage of students who graduate
within four years.
4-Year Graduation Rate (%)
100
80
60
40
College Comparisons
10 15 20 25 30 35
Semester Tuition (Thousands of Dollars)
Which statement best explains the relationship
between the variables?
O Higher tuition causes students to graduate at
higher rates.
O Tuition does not appear to have an association
with graduation rate.
O More selective colleges tend to have higher tuition
but lower graduation rates.
O More selective colleges tend to have higher tuition
and higher graduation rates,
The tuition does not appear to have an association with graduation rate.
A scatter plot is a particular kind of plot or mathematical diagram that displays values for generally two variables for a collection of data. It uses Cartesian coordinates. A dot is used to symbolize each point on the scatter plot. It is used to demonstrate the link between the dots by illustrating how many of them would fall within the path of a straight line.
It is clear that there is no relation between tuition and graduation rate. Some selective colleges may have higher tuition and higher graduation rates but there may be some selective colleges with higher tuition but lower graduation rates.
Hence, the tuition does not appear to have an association with graduation rate. Option 2 is correct.
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Answer:
I think it's A- Higher tuition causes students to graduate at higher rates.
Step-by-step explanation:
tell me if I'm wrong... forgive me if i am
"Solve the Equation."
if the equation only has one solution, enter "NS" (No Solution) .
if the equation has Infinite Many solutions, enter "IM"
1. 6(x+5)=6x+5
2. -4x=7x-33
The equation 6(x + 5) = 6x + 5 has NS (No Solution) and the equation -4x = 7x - 33 has IM (Infinite Many solutions).
Let us take the given equation
6(x + 5) = 6x + 5
⇒ 6x + 30 = 6x + 5
⇒ 6x - 6x = 5 - 30
⇒ 0 = -25
Hence, the given equation has No Solution (NS)
Let us take the given equation
-4x = 7x - 33
-4x - 7x = -33
-11x = -33
x = 3
Hence, the given equations has Infinite Many solutions (IM)
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Which criterion can be used to prove ABC and ADC are congruent? select the correct answer
ΔABC and ΔADC are congruent by angle-side-angle (ASA) postulate of triangle congruence.
In this question we have been given a quadrilateral ABCD and diagonal AC.
We need to prove triangle ABC and ADC are congruent.
In ΔABC and ΔADC,
∠BAC ≅ ∠ACD ...........(Given)
AC ≅ AC ...........(Common side)
∠ACB ≅ ∠DAC ..........(Given)
ΔABC ≅ ΔADC ..........(ASA postulate of triangle congruence)
Therefore, ΔABC and ΔADC are congruent by angle-side-angle (ASA) postulate of triangle congruence.
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The mean, median and mode of the numbers below are the same,
what is the value of a?
6, 2, a, 7, 4, 9,6
Answer:
8
Step-by-step explanation:
Put the numbers in order from lowest to highest. Add all the numbers together. We will ignore a for this step. You should get 34 when adding it all together. Then if you were to add 8 to that 34 you'd get 42. Divide 42 by the amount of numbers you have which is 7. Your answer is 6. Now to make sure 8 is our value. We want to make sure the median is also 6. to find the median you need to have the numbers in order for lowest to highest and find the number in the middle. Don't forget to add your new number 8 into that order. You should get 6 as the median. Therefore our answer is 8
Study the figure. What is the measure of the missing interior angle?
The value of the missing interior angle is 25°
What is a right-angled triangle?A right-angled triangle is a triangle, that has one of its interior angles equal to 90 degrees or any one angle is a right angle.
given angles of the triangle, 90° and 65°
Let, the unknown angle be x
so that,
x + 90 + 65 = 180 ( sum of angles in a triangle)
x + 155 = 180
x = 180 - 155
x = 25°
In conclusion, the unknown angle is 25°
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3x + 4y = 7
2x - y = 12
please help?
Answer:
x=5
y=-2
Step-by-step explanation:
even though this looks like they want you to do it elimination ima do substation cause I like that better
2x-y=12
+y. +y
2x=12+y
-12 -12
2x-12=y
Now we can fill in y
3x+4(2x-12)=7
3x+8x-48=7
11x-48=7
+48. +48
11x=55
/11. /11
x=5
fill in X to find y
2(5)-y=12
10-y=12
-10. -10
-y=2
y=-2
hopes this helps please mark brainliest
(14x - 2) - (11x-21)
Answer:
3x+19
Step-by-step explanation:
Distribute:
14 x − 2 − ( 11 x − 21 ) 1 4 − 2 − ( 1 1 − 2 1 )
14 x − 2 − 11 x + 21 1 4 − 2 − 1 1 + 2 1
Add the numbers:
14x−2−11x+21
14−2−11+2
Combine like terms:
14x+19−11x
14 +19−113x+193+19
Solution: 3x+19
Answer:
3x + 19
Example:
None.
5 The table shows the weights of different packages.
What is the approximate total mass of packages A, B,
and D? (Hint: 1 lb ≈ 0.45 kg)
Package | Weight (lb)
A | 0.25
B | 0.8
C | 1
D | 1.75
answers:
F 1.26 g
G 2.8 g
H 280 g
J 1260 g
Answer:
1710 grams (not on the answer list)
Step-by-step explanation:
The total weight of the 4 packages is 3.8 pounds (lbs). The conversion factor is (0.45 kg/lb).
(3.8 lbs)*((0.45 kg/lb) = 1.71 kg or 1710 grams. Pease check the numbers provided.
Are the ratios 3:12 and 1:4 proportional? Show your work.
Explain:
Answer:
Yes
Step-by-step explanation:
3:12 both have a common factor of 3 you divide both sides by 3 to get 1:4
how many 44-digit positive integers (that is, integers between 10001000 and 99999999, inclusive) having only even digits are divisible by 55?how many 44-digit positive integers (that is, integers between 10001000 and 99999999, inclusive) having only even digits are divisible by 55?
There are 100 4-digit positive integers are possible between 1000 and 9999.
Our first step is to divide the four digit number into four places: tens, hundreds, and thousands.
To solve this problem, we must start from the right-hand side and find how many even numbers should be placed where the desired answer can be obtained.
There are a total of [0, 2, 4, 6, and 8] objects
There should only be one digit on one place, since it is the only digit that makes the number divisible by five
There are 1 ways to fill the one's place, so the total number is 1.
It is possible to take any number from the given sets of even numbers in the tens place,
There are five ways to fill one place, so there are five ways to fill it.
Taking a look at the hundreds place,
All numbers can be placed in the hundreds place from the given sets, so all numbers can be taken from the hundreds place.
Therefore, there are five ways to fill the hundreds place.
Taking a look at the thousands,
It is possible to fill thousands of places with 4 numbers from a given set of even numbers.
Therefore, there are four ways to fill the thousands place
The next step is to use the concept of factorial to find the number of ways to make a 4-digit number from even numbers that are divisible by 5.
To fill the respective places, we will multiply all the ways we calculated
= 4 × 5 × 5 × 1
= 100
Hence, there 100 4-digit positive integers possible.
Question
how many 4-digit positive integers (that is, integers between 1000 and 9999, inclusive) having only even digits are divisible by 5?
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How many solutions does the
equation have?
3(d + 11) = 6(d + 33)
a. 0
b. 1
c. infinitely many
Answer: 1 solution
Step-by-step explanation:
3(d+11)=6(d+33)
simplifing the above equation
3d+33=6d+198
3d-6d=198-33
-3d=165
d= -165/3
d=-55
Answer:
b. 1
Step-by-step explanation:
3d + 33 = 6d + 198
3d - 6d = 198-33
-3d = 165
thus, d = -165/3
= -55
Which monomial function has a minimum value?
Oy = 5x¹0
Oy=-4x¹1
Oy=-x¹2
y=6x7
A monomial function that has a minimum value is y = 5x^10
In this question, we have been given four monomial functions.
y = 5x^10
y = -4x^11
y = -x^12
y = 6x
we need to find a monomial function that has a minimum value.
For function y = 5x^10, as x > 0 increases, f(x) increases. And as x < 0 decreases, f(x) increases.
We know that for even, positive monomial function if coefficient > 0 and exponent is even then a monomial has a minimum value.
Therefore, a monomial function that has a minimum value is y = 5x^10
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Graph proportional relationships, interpreting the unit rate as the slope of the graph. Compare two
different proportional relationships represented in different ways.
Will give points to first correct answer that follows all the steps right.
Answer:
I Need Help On That Too
Step-by-step explanation: