I need help with these questions I failed in class yesterday I need to see what I did wrong

2. Determine whether or not each relation is a function. Answer YES or NO. a. b. G. V= d. { (2, 5), (3, 6), (2, 7), (3,8)}3. Show that the difference quotient, f(xth)-f(x) h , for the function f (x) = x2 + 3 is 2x + h by calculating the following: a. f ( x + h) = b. f ( x + h) - f (x) = c. I(xth)-f(x) = h3 ifx 3 a. f(-2) = b. f(-1) = c. f(0) = d. f(5) = 6. Caroline makes a base pay of $145 a week plus a commission of $6 for every item that she sells. Write her salary S as a function of the number of items sold x. 7. Determine the slope-intercept form of the equation of the line that passes through the points (5, -2) and (3, -3)