Strawberries are on sale for $0.75 a pound, and you have a coupon for $0.40 off your total purchase. Write a function rule for the cost of n pounds. How much would 20 pounds of strawberries cost?
A. y=0.75x ; $15
B. y=0.75x-0.40 ; $14.60
C. y=(0.75-0.40)x ; $7
D. y=0.4x - 0.75 ; $7.25
The correct answer is D. y=0.4x - 0.75 ; $7.25.
To find the cost of n pounds of strawberries, the function rule is given by y = 0.75n - 0.40.
Substituting n = 20 into the equation, we get y = 0.75(20) - 0.40 = $15 - $0.40 = $14.60.
Therefore, 20 pounds of strawberries would cost $14.60.