How many minutes per lap does it take a runner who after 45 minutes
has run 9 laps?

5 minutes per lap.

Step-by-step explanation:

45÷9=5

you never say the total so we cant find the percentage used for petrol

step-by-step explanation:

problem:

f(x) = - 2/3x + 5; f(5/2)

substitute 5/2 in for x:

f(5/2) = -2/3(5/2) + 5

simplify the right side:

f(5/2) = -5/3 + 5

f(5/2) = 10/3

f(5/2) = 10/3

i hope this !