Sal recorded the cost of his monthly home heating bill and the corresponding average monthly temperature for the past 15 months. He displayed the information in a scatter plot and used a graphing calculator program to find the least squares regression line to fit the data. Sal wants to use the least squares regression line to predict the cost of his heating bill when the average monthly temperature is 40°F. Which statement is true?

c

step-by-step explanation:

d.) yes, because the volume of the cone is greater than the volume of the sphere

step-by-step explanation:

the revenue of the fitness center, y, is the product of two factors: the number of members and the fee paid by each member. there are 320 members now, but number of members goes down by 10 for each $5 increase in fees, so if x is the number of $5 price increases then members is equal to (320 - 10x). since the fee is currently $45, and the fee increases by $5 for every price bump x, the fee is given by (45 + 5x). so, revenue y is given by y = (320 - 10x)(45 + 5x).