Evaluate the expression (ab)^2for a=2 and b=5

How much dextrose 70% must be mixed with dextrose 5% to prepare 1,000 ml of dextrose 20%?

Two cyclists 84 miles apart start riding toward each other at the samen time. one cycles 2 times as fast as the other. if they meet 4 hours later what is the speed (in miles) of the faster cyclists

Solve each quadratic equation by factoring and using the zero product property. 10x + 6 = -2x^2 -2