The cost of a certain new truck is $21,000. The value of the truck depreciates at a rate of 9% per year. Write a function, f(x), that models
the value of the truck x years after its purchase.

The graph shows the distance y, in inches, a pendulum moves to the right (positive displacement) and to the left (negative displacement), for a given number of seconds x. how many seconds are required for the pendulum to move from its resting position and return? enter your answer in the box.

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

Can someone factor this fully? my friend and i have two different answers and i would like to know if either of them is right. you in advance. a^2 - b^2 + 25 + 10a