Write an expression to show how you could calculate the total amount David paid.

Total = $100

Step-by-step explanation:

y = total amount

x = amount per hour

b = initial amount cost

m = amount of hours

y=mx +b

y = (5)(15) + (25)

y = 100

1. 3. can also be expressed as (22/7)

2. -4.5

3. 3.6

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the answer is about 24 dollars