exam Maths Puzzle Numerical Ability

Factor.

12x^4y^3 + 16x^3y^3 - 20x^3y^4 i think i got this but want to make sure.

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exam Other Question

An astronaut standing on the surface of the moon throws a rock upward. The height of the rock is given by s=-2.7t^2+27t+6.3, where s is the height in metres and t is the time in seconds.What was the initial height of the rock? [88-(4 to the second power divided by 2)]-3]

1/2x28-4 to the second power