Is the significance level of a hypothesis test equivalent to the probability that the null hypothesis is true?

In the coordinate plan (-6,9) b (3,9) c (3,3) def is shown in the coordinate plan below

If on=8x-8,lm=7x+4,nm=x-5,and ol=3y-6

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?