Question

The cost "c" (in dollars) of renting a paddle board for "h" hours is given by c=25+7h. After how many hours is the cost $81?

Answer 1

c = 25 + 7h...c = 81
81 = 25 + 7h
81 - 25 = 7h
56 = 7h
56/7 = h
8 = h......so at 8 hrs, it will cost $ 81

Answer 2

Answer: 8 hours

Explanation:

Given : The cost "c" (in dollars) of renting a paddle board for "h" hours is given by
`c=25+7h`

Now, put the value of c= 81 in the given equation, then we have

`81=25+7h`

Subtract 25 on both sides , we get

`7h=81-25\\\\\Rightarrow\ 7h=56`

Now, divide 7 on the both sides , we get

`h=8`

Hence, the number of hours for the cost of $81 = 8