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

@imqwerty

phi · Answer

ignore the coupon for the moment.
ignore "n pieces of candy"

just look at 
costs $0.75 each

Now think (ask the question to yourself):  how much does one piece of candy cost?