Aquantity a varies directly as a quantity b, if, when b changes, a changes in the same ratio. what happens to the quantity a if the quantity b doubles in value?

The weight v of an object on venus varies directly with its weight e on earth. a person weighing 120 lb on earth would weigh 106 lb on venus. how much would a person weighing 150 lb on earth weigh on venus?

What is the value of the discriminant, b2 ? 4ac, for the quadratic equation 0 = x2 ? 4x + 5, and what does it mean about the number of real solutions the equation has?

What is the solution set for z+10=z-2