Beth sold Half of her comic books and then bought nine more. She now has 28. With how many did she begin with? ( I need the step by step of how to solve this)

"princess tower" in dubai is considered the world's tallest residential building, towering to 1 0 1 101 floors! t ( n ) t(n) models the number of tenants living on floor n n of the tower. what does the statement t ( 2 0 ) = t ( c ) t(20)=t(c) mean?

Write two subtraction equations that are equivalent to 5 + 12 = 17.

Find and simplify an expression for the area of five rows of x squares with side lengths of x centimeters.