Are 1/2 and 12/24 and 13/26 equivalent?

How long must $542 be invested at a rate of 7% to earn $303.52 in interest? in a easier way

What is the value of the discriminant of the quadratic equation -2x = -8x + 8 and what does its value mean about thenumber of real number solutions the equation has?

The candy store is having a 30% off sale. emma is going to buy $7.50 worth of candy. how much will she pay after the discount