I need help I don’t understand

Answer:

  a) y-intercept = 17; initial design strength percentage

  b) slope = 2.8; increase in that percentage each day

  c) 29.6 days to 100% design strength

Step-by-step explanation:

a, b) The equation is in the form called "slope-intercept form."

  y = mx + b

where the slope is m, and the y-intercept is b.

Your equation has a slope of 2.8 and a y-intercept of 17.

The y-intercept is the percentage of design strength reached 0 days after the concrete is poured. The strength of the concrete when poured is 17% of its design strength.

The slope is the percentage of design strength added each day after the concrete is poured. The concrete increases its strength by 2.8% of its design strength each day after it is poured.

__

c) To find when 100% of design strength is reached, we need to solve for x:

  100 = 2.8x +17

  83 = 2.8x

  83/2.8 = x ≈ 29.6

The concrete will reach 100 percent of its design strength in about 30 days.

Answer:

Distance= 6.6 miles

Bearing= N 62.854°W

Step-by-step explanation:

Let's determine angle b first

Angle b=20° (alternate angles)

Using cosine rule

Let the distance between the liner and the port be x

X² =8.8²+2.4²-2(8.8)(2.4)cos20

X²= 77.44 + 5.76-(39.69)

X²= 43.51

X= √43.51

X= 6.596

X= 6.6 miles

Let's determine the angles within the triangle using sine rule

2.4/sin b = 6.6/sin20

(2.4*sin20)/6.6= sin b

0.1244 = sin b

7.146= b°

Angle c= 180-20-7.146

Angle c= 152.854°

For the bearing

110+7.146= 117.146

180-117.146= 62.854°

Bearing= N 62.854°W

Answer:

the sign of the product of 15 negative numbers will be negative

Step-by-step explanation:

Heya mate!!

The product of odd numbers is odd and the product of even numbers is even.

so 15 is an odd number then the sign of product is odd

Hope this helps!!!

Answer:

10 cm

Step-by-step explanation:

2/10=x/50

cross multiply

2*50=x*10

100÷10=x

x=10

Answer:

37 7/33 or 37.212

Step-by-step explanation:

6j + 23 + k/l - 3

If j = 3, k = 7, and l = 33:

6 × 3 + 23 + 7/33 - 3

= 18 + 22 + 7/33 - 3

= 40 + 7/33 - 3

= 40 7/33 - 3

NOTE: Because 40 and 3 are whole numbers, 3 will be subtracted from 40.

= 37 7/33 or 37.212

Answer:

Step-by-step explanation:

-3 is the difference

Answer:

2 pages/min

Step-by-step explanation:

Unit rate is:

  1/5 page        1 * 10

------------------ = --------- page/min = 2 pages/min

 1/10 min           5 * 1

Answer:

30 seconds

Step-by-step explanation:

1/10 of a minute: 6 seconds

60/10 = 6

6x10 = 60

now, if 6 seconds is 1/5 of the page you need to multiply

6 x 5 = 30 seconds

it takes him 30 seconds to write a page

Answer:

a

Step-by-step explanation:

Answer: It's 176/25 or 7 remainder 1/25

Answer:

Mark’s method is correct, because even though it is impossible to deliver mail to 1.2 houses in a minute, 1.2 represents the unit rate of houses per minute.

Step-by-step explanation:

Just took the test.

Both the steps performed by Mark to determine ,the houses the carrier can deliver mail to in 7.5 minutes at this rate is correct .

The unitary method is a technique for solving a problem by first finding the value of a single unit, and then finding the necessary value by multiplying the single unit value.

According to the question

A mail carrier can deliver mail = 36 houses

Time taken to deliver mail in 36 houses = 30 minutes

Mark wants to determine , the houses the carrier can deliver mail to in 7.5 minutes at this rate.

By using unitary method :

Step1: First divide 36 houses by 30 minutes to find a unit rate  

[tex]rate = \frac{36}{30}[/tex]

rate = 1.2 houses in a minute  

Step2: Then multiply the rate to the required time

i.e  1.2 * 7.5  = 9 houses

Hence , Both the steps performed by Mark to determine ,the houses the carrier can deliver mail to in 7.5 minutes at this rate is correct .

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Answer: A) Whole number

Explanation:

The set of whole numbers is {0,1,2,3,...} showing that negative values are not in this set. A distance below sea level is written as a negative (where positive values are above sea level). So you won't use the set of whole numbers for this type of problem.

In contrast, something like the set of integers is {..., -3, -2, -1, 0, 1, 2, 3, ... } including negatives this time. For example, we can write -10 to indicate we're 10 feet below sea level. Rational numbers and real numbers can also be negative.

9+5=14 bx8=8b  Hope this helps sir or miss!

====================================================

Explanation:

The three angles add to 180, so x+y+z = 180

The second and third angles add to 3 times the measure of the first, so y+z = 3x

The third angle is 29 more than the second, so z = y+29

----------------------------

The system of equations is

[tex]\begin{cases}x+y+z = 180\\\\y+z = 3x\\\\z = y+29\end{cases}[/tex]

For now, let's focus on the second and third equations only.

Start with y+z = 3x. Replace z with y+29 which is valid because of the third equation.

So we'll have

y+z = 3x

y+y+29 = 3x

2y+29 = 3x

Let's isolate y

2y+29 = 3x

2y = 3x-29

y = (3x-29)/2

y = 3x/2 - 29/2

y = 1.5x - 14.5

We'll use this later.

--------------------------

Go back first equation of the system. Plug in z = y+29

x+y+z = 180

x+y+y+29 = 180

x+2y+29 = 180

Then plug in y = 1.5x - 14.5 we found earlier

x+2y+29 = 180

x+2(1.5x-14.5)+29 = 180

x+3x-29+29 = 180

4x = 180

x = 180/4

x = 45

---------------------------

We can use this x value to find y

y = 1.5x - 14.5

y = 1.5*45 - 14.5

y = 53

and use this to find z

z = y+29

z = 53+29

z = 82

As a check, x+y+z = 45+53+82 = 180 to help confirm the answer. I'll let you check the other equations.

Answer:

A. y = 0.8x + 4

Step-by-step explanation:

i just took the test

The equation of the linear model shown is A. y = 0.8x + 4

A linear model refers to a model where a response variable is being described. It should be noted that the response should be a continuous variable

The linear model is the framework for the set of models that predict a quantitative dependent variable through the independent variables given.

Based on the diagram, the equation of the linear model shown is y = 0.8x + 4

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We can solve this problem in two ways.

1. From the description we conclude that the described sequence is a geometric sequence where the first term a₁ = 2 and common ratio r = 3, so:

[tex]\boxed{a_n=2\cdot3^{n-1}}[/tex]

Answer D.

2. The easiest way. We know that a₁ = 2, so let's substitute n = 1 for each of the possible answers:

A. 3·2ⁿ = 3·2¹ = 3·2 = 6 - Wrong

B. 2·3ⁿ = 2·3¹ = 2·3 = 6 - Wrong

C. 3·2ⁿ⁻¹ = 3·2¹⁻¹ = 3·2⁰ = 3·1 = 3 - Wrong

D. 2·3ⁿ⁻¹ = 2·3¹⁻¹ = 2·3⁰ = 2·1 = 2 - Correct.

Answer:

the answers are

a) Area of triangle is 15 square inches

Perimeter of triangle is 18.5 inches.

b) Area of trapezium is 210 square cm.

Perimeter of trapezium is 61.5 cm.

c) Area of parallelogram is 21 square yards

perimeter of parallelogram is 22 yards

Step-by-step explanation:

Area of triangle is 1/2( base × height)

Area of trapezium is 1/2(p1 + p2)×height

Area of parallelogram is base × height

It is 25 C

76 - 51 = 25

Answer:

157

Step-by-step explanation:

First, let's subsitute a and f.

6(2)^2 + 4(4) - 3

Remeber the order of operations. Paranthesis, exponents, multiply, divide, add, subtract.

12^2 + 16 - 3

144 + 16 - 3

157 is the answer. Hope this helps!!!!!!

Answer:

22.5 cm3

Step-by-step explanation: i took thy test

The volume of the rectangular prism is 22.5 cm³

A rectangular prism is a three-dimensional shape, that has six faces (two at the top and bottom and four are lateral faces). All the faces of the prism are rectangular in shape. Hence, there are three pairs of identical faces here. Due to its shape, a rectangular prism is also called a cuboid.

Given here A right rectangular prism has a length of 10 centimeters, a width of 2.5 centimeters and a height of 0.9 centimeters.

Now we know the volume of the rectangular prism is given by

The volume of a rectangular prism = Length x Width x Height cubic units.

∴ V= 10×2.5×0.9

     = 22.5 cm³

Hence, the volume of the rectangular prism is 22.5 cm³

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Full question attached

Answer:

UCL for x bar chart=7.145

LCL for x bar chart=4.874

Explanation:

Please find answer attached

Step-by-step explanation:

2,300×3÷7=985.71 The amount of money saved

2300×1÷10=230the amount of entertainment

985.71+230=1215.71 total

1215.71÷2300=0.5285 Entertainment money + reserve money ÷ total money

The income that he plan to spend each month on these two items together is 0.5285.

A fraction represents a part of a number or any number of equal parts.

Given; Travis's income is $2300 a month, and he plans to budget 3/7 of his income for savings and 1/10 of his income for entertainment.

We need to find the income that he plan to spend each month on these two items together.

The amount of money saved;

2,300×3÷7 = 985.71

The amount of entertainment;

2300×1÷10=230

The total 985.71 + 230 = 1215.71

Now, Entertainment money + reserve money ÷ total money

1215.71÷2300 = 0.5285

The income that he plan to spend each month on these two items together is 0.5285.

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Answer:

(6, -7)

Step-by-step explanation:

(x, y)=(4, -1)

(x1+x2)/2=4

(y1+y2)/2=-1

-----------------

x1+x2=8

2+x2=8

x2=8-2=6

---------------

y1+y2=-2

5+y2=-2

y2=-7

---------------

(6, -7)

Answer: 110

Step-by-step explanation:

Answer:

Step-by-step explanation:

Answer:

angle 1 and 3 are equal by vertically opp. angle

3x-1 = 2x +9

3x-2x = 9+1

x = 10

put the value of x in any equation

3(10)-1 = 29

angle 1 = angle 3 = 29

angle 2 + angle 3 = 180 ° (linear pair)

angle 2 = 180 -29

angle 2 = 149

angle = angle 3 = 149.

Hope it helps

Answer:

y = 5

Step-by-step explanation:

We khow that x and y are consecutive integers and that x^2 is greater than y^2 since x^2-y^2=11

● so x is greater than y

● wich means that x = y+1

● x^2-y^2=11

● (y+1)^2-y^2 = 11

● y^2+2y+1-y^2=11

● 2y + 1 = 11

● 2y +1-1 = 11-1

● 2y = 10

●2y/2 = 10/2

● y = 5

Answer:yes

Answer: [-5,∞)

Step-by-step explanation:

z-18 ≥ -23     Add 18  to both sides

 +18   +18

z ≥ -5    

Which means x has to be greater than negative 5.

In interval notation it will be [-5,∞)

Answer:

z ∈ [-5; +∞)

Step-by-step explanation:

z - 18 ≥ - 23

<=> z ≥ 18 - 23

<=> z ≥ -5

----> z ∈ [-5; +∞)

Answer:

Step-by-step explanation:

15 + 10 = 25

HI = 25

Answer: 5

Step-by-step explanation:

Answer:

Step-by-step explanation:

The quotient of Y and 6 is 29" translates to Y/6 = 29. Solve this for Y

Y/6 = 29

Y = 29*6

Y = 174

So the second option is good

Number 15 is most likely  the last option

Answer:

[tex] \boxed{ \bold{ \boxed{ \sf{1. \: \: \: \: \frac{y}{6} }}}}[/tex]

[tex] \boxed{ \bold{ \boxed{ \sf{ 2. \: \: \: - 8}}}}[/tex]

Step-by-step explanation:

1. Quotient is a term for a division.

Quotient of y and 6 is written as y / 6

2. - 2 - 6

Calculate it :

= -8

hope I helped!

Best regards! :D