Answer:
Toothbrushes: 100
Floss: 1050
Step-by-step explanation:
to find the number of toothbrushes, you multiply 50*20....to get the floss you multiply 15*70
9x-7x= 2x
because both are x's now u cant add nor subtract anything to Y so just leave it alone but u can add 6+14
2x+8y=20
Store one since the 15% is take off 90 dollars which makes it 510
Answer: Once
Step-by-step explanation: If you do 100 - 10 you get 90 as result, therefore you don't have 100 anymore making the only logical answer to this "ONCE".
