Answer:
-14
Step-by-step explanation:
12-26
10-20=10
2-6=4
-14
I may have done this wrong
She is saving $24!
explanation: multiply .2 (20%) by 120.
Answer:
a) 910
b) 828100
c) 144320
Step-by-step explanation:
a. ∑y
This is the sum of all values of y. So

b. (∑y)^2
This is the square of the sum, so the square of 910, that we found in the previous item.
910² = 828100
c. ∑y^2
This is the sum of the squares of each amount spent. So
