(2x-7)² ?!? I really need some help

Plz hurry evaluate the expression a+b where a=8 and b=19

Enter the amplitude of the function. f(x)=3cosx

The daily production of a company is modeled by the function p = -w^2 + 75w - 1200. the daily production, p, is dependent on the number of workers (w) present. if the break-even point is when p=0, what are the least and greatest number of workers the company must have present each day in order to break even? 50 points! will give brainliest!