Chapter 5.3, Problem 45E

Parameterize the following portions of curves: (a) e The straight line between (-5, 3) and (11, 11). (b) A portion of the function f(x) = r* + 1 from (1, 2) to (-2,-7) Three-quarters of the unit circle traversed counter-clockwise, starting at (1,0).

please help!

a projectile launched at t=0 (t is measured in seconds) follows a path given by x=30t, y=-5t^2+80t, where x is the horizontal direction and y is the upward direction. the projectile lands after  a. 16 seconds b. 8 seconds c. 4seconds