Ralph is 3 times as old as sara. in 4 years, ralph will be only twice as old as sara will be then. find ralph's age now. if x represents sarah's age now, which of the following expressions represents ralph's age in four years?

Which graph represents the solution set for the given system of inequalities? x+2y< 3 x+y> 4 3x-2y> 4

If y varies directly as x2 and y=6 when x=6, find the constant of variation.

I'm at a bookstore with $\$35$ in my pocket and a $20\%$-off coupon. what is the cost of the most expensive book i can buy with my money and the coupon? (assume that there are books of every possible price in the bookstore. it's a large bookstore! )