The first one, I'm not sure how to prove that, but for the other three the graphs clearly coincide if you draw them.
VictorHesling, your teacher is obviously messing with you. The best thing to do in a situation like this, is give her a messing with you answer. Some suggestions are
1. 13.20x37y.>23 (So some random numbers)
2. He won't get to the top if he wears red underwear. Never run with red underwear.
Answer:
$421.10
Step-by-step explanation:
If the discount is 10%, that means the sale price is 90% of the original price.
Write the equation that represents that:
378.99 = 0.9x. Solve for x. Divide both sides by 0.9
378.99/0.9 = 421.10
That is the price before the discount and tax.
Question A is b and question B is d