Do Not explain just give answer. Finish quick please.

7. Determine the value of d_y for y . 2,- x when x = 0. dx x + l a. 5 c. l b. 2 d. 2 8. Determine f'(2) for x) - x2 + 4x- 1. a. 7 c. 11 b. 8 d. 12 9. The position function of an object moving horizontally along a straight line as a function of time is 5(1) =3? - 4:2, in metres, at time, t, in seconds. Determine the acceleration of the object at t=4s a. 184 111/52 0. 56 m/s2 b. 248 m/s2 (1. 352 m/s2