2x + 3x + 20 + 10x - 5 = 10x + 16 What does x equal?

Hel and a good explanation, not just the answer pls.

How long would it take for a ball dropped from the top of a 576-foot building to hit the ground? round your answer to two decimal places.

Volume of cylinder with a radius of 8cm and height of 25 cm

You are updating your garage and the only thing left to paint is your garage day. you're only going to paint the slide that faces the street. the garage door is 9 fert 8inches tall and 120 inches wide. you need to know the surface area of the side of the garage door to determine how much paint to buy. the hardware store sells paint by how much covers a square foot. what is the surface area you should report to the hardware store what is the answer