Two lines of regression are 8x-10y_66=0,40x-18y-214 =0 find mean value of x and y

The human resources manager at a company records the length, in hours, of one shift at work, x. he creates the probability distribution below. what is the probability that a worker chosen at random works at least 8 hours? 0.62 0.78 0.84 0.96

Solve the system of equations. y=3x-1 and y=-2x+9. show work

What is the output, or dependent variable of quantity? 1: x 2: f(x) 3: y