What is the solution for x in the equation?

Astuntman jumping off a 20-m-high building is modeled by the equation h=20-5t^2, where t is the same in seconds. a high-speed camera is ready to film him between 15m and 10m above the ground. for which interval of time should the camera film him?

What is 100,000 times 1/100,000, using the standard method of multiplication? write the answer as 10 to a power.

Using only odd number for numerators write two different subtraction problems that have a difference of 3/4