Answer and workings in the attachment below.
Answer:
Her weight before was 100kg.
Step-by-step explanation:
This question can be solved using a rule of three.
Amy finds that her weight has decreased by 25%
So her weight is 100-25 = 75% = 0.75 of the original amount(what it was before).
Her current weight is 75kg.
Her previous weight was x, which is 100% = 1.
So
75 - 0.75
x - 1



Her weight before was 100kg.
Answer: 1st, 3rd, and 4th functions
Step-by-step explanation:
Assuming k(x)=9x^2, all the other functions have inverses because they are linear, meaning they must be one-to-one.
She charges $15 extra for each hour increased.
15+15=30 ,30+15=45, 45+15=60.
$15 is the unit rate.
Answer:
2.24
4.56
6.-46
Step-by-step explanation:
24-0
45+11
-55+9