Which is describing the whole unit in this scenario?

"15 is what percent of 90"

The revenue each season from tickets at the theme park is represented by t(c)=5x. the cost to pay the employees each season is represented by r(x)=(1.5)^x. examine the graph of the combined function for total profit and estimate the profit after four seasons

For what values of the variable x is the expression square root of 7x+14+ square root of 7-x a real number?

For the inequality |c| < |d| to be true, which of the following must be true?