Que expresión representa el doble del producto de la diferencia entre dos variables distintas y una constante Me urge mucho

Solve each quadratic equation by factoring and using the zero product property. x^2 - 8x + 30 = 3x

The perimeter of a rectangle is 42 inches. if the width of the rectangle is 6 inches, what is the length

Julie goes to the sports store and spends $40.50 before tax. she buys a pair of shorts for $21.75 and 3 pairs of socks that each cost the same amount. how much does each pair of socks cost? $$