What are the solution(s) to the quadratic equation 40 - x2 = 0?
Ox= +2/10
0 x = +4/10
O x = +255
O x = +455

Aparticle moves on a line away from its initial position so that after t hours it is s = 2t^2 +3t miles from its initial position. find the average velocity of the particle over the interval [1, 4]. include units in your answer.