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Lilit [14]
3 years ago
9

An electrician charges $20 for a service call plus $40 per hour of service. Write an equation in slope-intercept form for the co

st, C, after h hours of service. What will be the total cost for 8 hours of work? 10 hours of work?
Mathematics
1 answer:
Zigmanuir [339]3 years ago
5 0

Answer:

Step-by-step explanation:

Regular charge- $20                                      

Every hour of service cost- $40

Equation or slope intercept form-

C= 40h+20

Part 1-  20+40(8)=

40 multiplied by 8                320+20         = $340

Part 2-  20+40(10)=

40 multiplied by 10             400+20           = $420

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A line passes through the point (4,8) and has a slope of -3/2<br><br>Write an equation in Ax+By=C
nydimaria [60]

Answer:

The answer is

<h2>3x + 2y = 28</h2>

Step-by-step explanation:

To find an equation of the line using a point and the slope we use the formula

y - y1 = m(x - x1)

where

m is the slope

(x1 , y1) is the point

From the question

slope = -3/2

Point = (4,8)

So the equation of the line is

y - 8  =  -  \frac{3}{2} (x - 4)

Multiply through by 2

2y - 16 = -3( x - 4)

2y - 16 = - 3x + 12

3x + 2y = 16 + 12

We have the final answer as

<h3>3x + 2y = 28</h3>

Hope this helps you

6 0
4 years ago
An art teacher needs to buy at least 60 brushes for her class. The brushes are sold in packs of 8.
kari74 [83]

Answer:

The art teacher needs to buy at least 8 packs of 8 brushes.

Step-by-step explanation:

Every pack has 8 brushes. She needs AT LEAST 60 so she cannot have less than 60 brushes but can have more than 60. 8 x 8 =64 so she would have 4 bushes left over. She needed to buy 8 packs so she can have at least 60.

4 0
4 years ago
10. Mary is feeding the dog that comes every night.
Tanzania [10]

The passive voice of the sentences will be:

  • The dog that comes every night is fed by Mary.
  • Iceland's waterfalls are said to be wonderful by people.
  • The latest trends in technology are being followed young people.

<h3>What is a passive voice?</h3>

It should be noted that a passive voice simply means a form of verb where the subject undergoes the action of the verb.

In this case, the passive voice is used to emphasize the action. In order to identify the passive voice, one should look at what happened and who was responsible.

Learn more about passive voice on:

brainly.com/question/25897080

6 0
2 years ago
How many times is 77 grader than 34
Agata [3.3K]

Answer:

77- 43=34

It needs to be added by 43 to get 77.

So, 43 is the answer.

8 0
4 years ago
The circumference of a circle is 157 centimeters. What is the area of the circle in terms
DENIUS [597]

Answer:

The area of the circle is 56.25π cm²

Step-by-step explanation:

  • The formula of the circumference of a circle is C = 2πr, where r is the radius of the circle
  • The formula of the area of a circle with radius r is A = πr²

<em>To find the area of the circle use the formula of the circumference to find its radius and then use the formula of the area to find its area</em>

∵ The circumference of a circle is 15π centimeters

∵ C = 2πr

- Equate 2πr by 15π

∴ 2πr = 15π

- Divide both sides by π

∴ 2 r = 15

- Divide both sides by 2

∴ r = 7.5 centimeters

Now let us use the rule of the area to find it

∵ A = πr²

∴ A = π(7.5)²

∴ A = 56.25π centimeters²

The area of the circle is 56.25π cm²

7 0
3 years ago
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