I believe that the answer is 10x + 5.
Coefficents are also know as "multipliers". They pair with variables (in this case, that is x). Constants are simply numbers on their own.
Hope that makes sense.
Answer:
the 3rd choice, 10x + 5, looks good
Explanation:
a coefficient is the number in front of a variable , so that's 10
a constant is a number w/o a variable ... so that's 5
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