Solve for x.

x-4 1/2 = 9 1/3
plz my sister is timed on a test

Ineed i been stuck on this question since yesterday

The power generated by an electrical circuit (in watts) as a function of its current c (in amperes) is modeled by p(c)= -15c(c-8) what current will produce the maximum power?

Mr. chen is parking in a lot downtown. the graph shows the relationship between the time and the total cost of parking. evaluate the function for and input of 10.