Aball is launched upward at 20 meters per second (m/s) from a 60 meter tall platform. the equation for the object's height s at time t seconds after launch is s(t) = –4.9t2 + 20t + 60, where s is in meters. how long before the object hits the ground after launch?

6, 10

9, -13

12, -21

18, -23

step-by-step explanation:

you just add 6 to the x-coordinate and subtract 10 from the y-coordinate.

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a: 1/6, j: 1/4

step-by-step explanation: you are welcome