Answer:
Step-by-step explanation:
Answer:

Step-by-step explanation:
If you expand an equation you get its equivalent expression
Shifting a graph up by c units involves adding c to the whole function
therefor
y=ax^2+c is c units higher than y=ax^2 (aka, it is shifted c units up)
30$ originally - 21$ paid = 9$ discount
> divide the discount by the original price, multiply by 100 to get the percent decrease.
100 x (9$ / 30$) = 30% discount
> So the shoes where on sale for 30% off the original price.
for the equation:
100 x (30-21)/30 = % decrease
Answer:
60 & 42
Step-by-step explanation:
Just know it.
Good Luck!!