Who ever gets my questions right will get 50 points

Given f(x) = 2x^2- 5x+1, determine the function value f(2). do not f(x) = in your answer

If x = -2, then x 2-7x+10 equals a. 0 b.20 c.28

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