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marissa [1.9K]
3 years ago
12

The cost of a plumbing repair is given by the equation y=45x+30, where x is the number of hours the repair takes and y is the to

tal cost in dollars.if a repair costs a total of $300 how manny hours did it take?
Select the correct answer below.

A.6
B.7
C. 7 1/3
D.10
Mathematics
1 answer:
arlik [135]3 years ago
6 0
First you subtract the 30 from 300 and than 270/45 and your answer will be A. 6
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What is the completely factored form of this polynomial? 25x^2y^2-100
Law Incorporation [45]

Answer:

25x²y² - 100

= 25(x²y² - 4)

= 25(xy + 2)(xy - 2)

3 0
2 years ago
Select a solution for:<br> x^2=81/144
Brilliant_brown [7]

Answer:

x=3/4, -3/4

Step-by-step explanation:

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3 years ago
A sequence is defined by f(0) = -20, f(n) = f(n-1) - 5 forn &gt; 1.
bulgar [2K]

Answer:

1. Proved down

2. proved down

3. f(10) = -20 - 5 - 5 - 5 - 5 - 5 - 5 - 5 - 5 - 5 - 5

Step-by-step explanation:

Let us explain how to solve the question

∵ f(0) = -20, f(n) = f(n - 1) - 5 for n > 1

→ That means we have an arithmetic sequence with constant

   difference -5 and first term -20

1. → f(1) means we need to find the second term, which equal the

      term - 5

∵ f(1) means n = 1

∴ f(1) = f(1 - 1) - 5

∴ f(1) = f(0) - 5

∵ f(0) = -20

∴ f(1) = -20 - 5 → Proved

2. → f(3) means we need to find the third term, which equal the

   second term - 5

∵ f(3) means n = 3

∴ f(3) = f(3 - 1) - 5

∴ f(3) = f(2) - 5

→ f(2) = f(1) - 5

∵ f(1) = -20 - 5

∴ f(2) = [-20 - 5] - 5 = -20 - 5 - 5

∴ f(3) = [-20 - 5 - 5] - 5

∴ f(3) = -20 - 5 - 5 - 5 → Proved

3. → From 1 and 2 we notice that the number of -5 is equal to n,

      at n = 1 there is one (-5), when n= 3 there are three (-5)

∵ n = 10

∴ There are ten (-5)

∴ f(10) = -20 - 5(10)

∴ f(10) = -20 - 5 - 5 - 5 - 5 - 5 - 5 - 5 - 5 - 5 - 5 → Proved

6 0
3 years ago
What is the description of angle 4 as it relates to the situation below?
Murljashka [212]

Answer:

The correct option is 1.

Step-by-step explanation:

The angle of elevation is the angle formed by the line of sight and the horizontal plane for an object above the horizontal.

The angle of depression is the angle formed by the line of sight and the horizontal plane for an object below the horizontal.

Since the angle 4 is the angle between the line of sight and the ground for an object above the horizontal, therefore angle 4 is the angle of elevation from the person to the radar tower.

1. "Angle 4 is the angle of elevation from the person to the radar tower."

This statement is true.

2. "Angle 4 is the angle of depression from the radar tower to the person".  

This statement is is false.

3. "Angle 4 is the angle of depression from the person to the radar tower".

This statement is false.

4. "Angle 4 is the angle of elevation from the radar tower to the person".

This statement is false.

5 0
3 years ago
Read 2 more answers
Find The Quotient of 5/6÷ (-13/7)<br> 5/6÷(-13/7)=5/6. ​
Neko [114]

Answer:

  • - 35/78

Step-by-step explanation:

<u>The quotient of </u>

  • 5/6÷ (-13/7) =
  • 5/6×(-7/13) =
  • - 35/78
8 0
3 years ago
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