Use the gradient to find the directional derivative of the function at p in the direction of q. f(x, y) = 3x2 - y2 + 4, p(7, 1), q(8, 8)

Ineed with number 6 , explain how to get 1978

Solve for x and y a x= 13.3 y= 16.7 b x= 23.3 y= 12.5 c x= 7.5 y= 16.7 d x=7.5 y= 12.5

Find the magnitude, correct to two decimal places, made by each of the following with positive direction of the x axis a) y= x the answer is 45° but i don’t know how