need help ive always had trouble with writing functions.

Candy is on sale for $0.75 each. you have a coupon for $0.25 off your total purchase. write a function rule for the cost of n pieces of candy.

A. C(n)0.25n-0.75
B. C(n)=0.75n-0.25
C. C(n)=1.0n
D. C(n)=0.75n

Question

need help ive always had trouble with writing functions. 

Candy is on sale for $0.75 each. you have a coupon for $0.25 off your total purchase. write a function rule for the cost of n pieces of candy. 

A. C(n)0.25n-0.75
B. C(n)=0.75n-0.25
C. C(n)=1.0n 
D. C(n)=0.75n

anonymous · Answer

can you help @Marie_Loves_You ??

sammixboo · Answer

n = candy if you buy candy or .75 each, you buy 0.75n candy. If you have 0.25 off on your candy, then you subtract 0.25 from 0.75, so you will have what?

anonymous · Answer

i think the answer is b

anonymous · Answer

you will have 0.50 right? @sammixboo

rhystic · Answer

if you have 1 peice of candy then you will have .50 cents yes but because you don't know the amount of candy being bought you have to make the equation which is : .75n - 25 = C(n)

anonymous · Answer

oooooooooohhhhhhhhhhhhhh ok thanks ! @Rhystic