Mira bought 4 shirts for s dollars each but had a $5 coupon. write an expression to represent the amount of money mira will pay at the caah register

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 !

yes because there is exactly one y value for every x value

for function there can't be more than one value for every x value