What number is halfway between 70,000 and 80,000

Which of the following quartic functions has x = –1 and x = –2 as its only two real zeroes?

Someone answer asap for ! michele pushes a box d meters across a floor. she uses a force f, in newtons, to push the box. she pushes the box for t seconds. the formula p = fd/t calculates the power, p, in watts, that it takes for michele to complete the task. solve the formula for d.

Simplify the following expression 48^1/2