Ask question

Ask question

All categories

2 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

1 answer:

arlik [135]2 years ago

6 0

First you subtract the 30 from 300 and than 270/45 and your answer will be A. 6

You might be interested in

Question #2 <img src="https://tex.z-dn.net/?f=5x%2B9%5Cleq%204" id="TexFormula1" title="5x+9\leq 4" alt="5x+9\leq 4" align="absm

shutvik [7]

X is less than or equal to -1

6 0

2 years ago

A disease has a constant force of mortality, µ. Historically 10% of all people with the disease die within 20 years. A more viru

kolbaska11 [484]

Answer:

Step-by-step explanation:

For the disease having force of mortality µ.

we apply exponential distribution law

probability of dying within 20 years

p( x <20) = $1-e^{-\mu}$ = .1

$e^{-\mu}$ = .9

For the disease having force of mortality 2µ.

we apply exponential distribution law

probability of dying within 20 years

p( x <20) = 1 - $e^{-2\mu}$

= 1 - ( .9)²

= 1 - .81

= .19

or 19%

5 0

2 years ago

"A solar hot-water heating system consists of a hot-water tank and a solar panel. The tank is well insulated and has a time cons

puteri [66]

T(t)=e−kt(∫ekt[KM(t)+H(t)+U(t)]dt+C) M is the outside temperature, H is other things that affect temperature in the tank(0 in this case), and U is the solar panel. K comes from the time constant, and should be the inverse of the time constant I believe. T is temperature, t is time.

T(t)=e−164t(∫e164t[164(80)+4t]dt After integrating I keep getting −16304+256t+Ce−164t I calculate C to be 16414 setting t equal to 0 and using the initial conditions

6 0

2 years ago

The rational number -13/-5 lies to the right of zero on the number true or false.

Lemur [1.5K]

Answer:

true

hope it helps

PLEASE MARK BRAINLIEST

4 0

2 years ago

Read 2 more answers

Observe the table. How many times greater must the acceleration of Object B be than the acceleration of

gulaghasi [49]

Answer:

5

Step-by-step explanation:

You first start by finding the acceleration of the problem.

a=f/m

Which this case is 45.

The question is asking " How many times greater must it be than A?"

You then divide

45/9

Your final answer is 5.

3 0

2 years ago