Book Maths Puzzle Profit and Loss

what is the total cost for a family to stay one night at a campground if the charge is $18 for the parents plus $3 for each of the children?

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Book Other Question

How do i simplify the expression by combining like terms?
uv to the 2nd + 10-2uv to the 2nd +2
how do i translate the phrase into an algebraic expression. Let x represent the real number. ten decreased by the quotient of a number and 2?
the absolute value of the sum of a