Tolong bantu yah kak dengan rumus dan caranyya

In which form is the following function written? y = - 2(x – 3)(x + 5)

Abicycle training wheel has a radius of 3 inches. the bicycle wheel has a radius of 10 inches.approximately how much smaller, in square inches and rounded to the nearest hundredth, is the area of the training wheel than the area of the regular wheel? *

Aramp rises 4 feet over a distance of 10 feet. what is the length of the ramp?