Ashirt cost $20 .the sale tax is 5%.how much is the sales tax what is her total cost for the shirt

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

5x + 5

step-by-step explanation:

you should always add the diagrams and graphs we cannot see. this particular question is kind of borderline because we can make a graph for you.

(f + g)x = -x^2 +3x + 5 + x^2 + 2x

(f + g)x = 5x + 5

the graph of z = 5x + 5 is shown below. always use desmos when in doubt.