Answer:
The monthly cost = $9 + $0.39x
Step-by-step explanation:
Answer:
Graph C shows the line of best fit for the data.
Step-by-step explanation:
The line of Graph C is more centered and even than the other ones
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