The product of 15 and x is 15x. If you then want to substitute a numerical value for x to evaluate the expression of 15x when x equals that number then just multiply. For example,
if x = 3, then 15x = 15(3) = 45
if x = 10, then 15x = 15(10) = 150
Good luck! :-)
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3(x)=15 __ five is the anwser