Joan paid $47.98 for a jacket. If the tax rate is 8.25%, what was the cost of the jacket before tax?

add all the numbers and check the ones place.

the answer is 486. as the ones place is more than 4, the estimation will be the next 10 ie, 490

7

step-by-step explanation:

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