How do you solve for the unknown in the equivalent ratio using cross multiplication

Ben is three times as old as samantha, who is two years older than half of michel's age. if michel is 12. how old is ben?

The manufacturer of a new product developed the following expression to predict the monthly profit, in thousands of dollars, from sales of the productwhen it is sold at a unit price of x dollars.-0.5x^2 + 22x - 224what is represented by the zero(s) of the expression? a. the profit when the unit price is equal to 0b. the unit price(s) when the profit is equal to 0c. the profit when the unit price is greatestd. the unit price(s) when profit is greatest

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