Write a rule to describe the cost c(p) of an item on sale for 25% off as a function of its original price p.

C is the original cost of the item, D is the discounted price

D = .75c

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1. isolate the variable, in this case, d. subtract 35.5 on both sides of the equation.2. 52 subtracted by 35.5 is 16.53. therefore your answer would be d= 16.5this is the basics of pre algebra, isolating variable through adding, subtracting, multiplying, and dividing, if you have any other questions to ask just comment!