Plz solve and explain clearly. Thank you

Multiple Choice: Choose the best answer. 1. In a test flight of the Mccord Terrier, Mccord Aviation's experimental VTOL (vertical takeoff and landing) aircraft, it was determined that t seconds after liftoff, when the craft was operated in the takeoff mode, its altitude (in feet) was 12 -Ly -1 +10r . Find an expression for the craft's acceleration at time t. a. a(t) =1 -6: +20 b. a(t ) =-12-31 +20 c. a(t) = =1'-312 +201 d. a(1 ) = -1p+, 360 16 3. Calculate the first derivative of y =6x3 + 3x4-6 a. y = 3x +x - 6x b. y' = 2x2 + 7 x C. y = 18x3 +12x3 d. y' = 18x + 12x -6 5. Given that x- and y-coordinates of a moving particle are given by the indicated parametric equations, find the magnitude and direction of the velocity for the specified value of t. x =217 +61 -7, y -912 +51-2,t =6. a. 116.91275.1' b. 104.56/255.1' c. 116.91/255.1' d. 104.56275.1 6. Evaluate the limit algebraically, if it exists: lim 6x -12 Max ' + 6 a. 0 b. -2 C . Co d 6 7. If y2-18x2 -2xy =-6, then dx a. 18x+y y- x b. 18x y- 1 y +x C. 18x+ y d. 18x + y y 10. Integrate: (x' -4x* +3) dx x 4x a. -+3x +C 8 5 x8 4x5 b. 8 5 +3x + C C. 7 --x +3x+C d. 7x -16x3 + C