Which way is better?

the best way is to follow the law, sales tax is not subject to discount by the seller.

Step-by-step explanation:

both ways result in the same outcome:

improper way, discount after tax

$50+$5(tax)=$55, after discount $55-$11(20%)=$44

proper way, discount before tax

$50-$10(20%)=$40+$4(tax)=$44

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

he will have 300 because he is really broke and 300 is in his imangine

step-by-step explanation: he ehe heh step by the thy