Question 1155163
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Hi  
18.       4.9t2 + 24.5t - 117.6 = 0
19.           t = (-24.5 +( 24.5^2 + 4x4.9x117.6)^0.5)/ 9.8
               t = 3 seconds.
20.          4.9t2 + 24.5t - 49 = 0
              t = (-24.5 +( 24.5^2 + 4x4.9x 49 )^0.5)/ 9.8
*[invoke quadratic "x", 4.9, 24.5, -49]