Um i just started school about three weeks ago and im in advanced but i have not learned that
Answer:

Step-by-step explanation:
Move
to the denominator in 
using the negative exponent rule 
First you add up all the items and the coupon then you will get $24.51. then subtract $50.00 take away $24.51 then you will get $25.49. So when she left the store she had $25.49
Answer:
84 98
Step-by-step explanation: