If f(x) = x/2 + 8, what is f(x) when x = 10?

What could explain what happened when the time was equal to 120 minutes

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.

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.