What are the domain and range of the function f(x)=x^4-2x^2-4?

The perimeter of a movie screen is 54 meters. the screen is 18 meters wide. how tall is it?

Expresa commuter train leaves downtown sation and travels at a average speed of 55 miles per hour towards the north side sation, which is 50miles away. thirty minutes later, express commuter train #7 leaves north side and travels at a average speed of 35miles per hour towards downtown sation. at the moment the two trains pass each other, how far(in miles) is train #12 from the downtown sation and how long(in minutes) has the #12 train been traveling

You deposit $5000 each year into an account earning 3% interest compounded annually. how much will you have in the account in 30 years?