Question

The equation of the linear regression line represents the relationship between the number of cars washed for charity, x, and the amount earned for charity, y. yˆ=10x+20 How much money can the charity expect to earn if 50 cars come in for a wash?
a $3
b $20
c $720
d $520

Answer 1

$520.
y=10x+20 
Where x is the amount of cars.
y=10(50)+20
y=500+20
y=$520
Answer option D