Ignoring air resistance, how long would it take a
dropped penny to fall 100 ft on earth?

I’m on question 7 it says a covered water tank is in the shape of a cylinder the tank has a 28 inch diameter and a height of 66 inches to the nearest square inch what is the surface area of the water tank

Prove that 16^4-2^13-4^5 is divisible by 11.

Lana's family entered a 5-kilometer race lana's average step length is about 0.5 meter how many steps will she need to take the finish