exam Maths Puzzle Numerical Ability

I'm lost on this one.
A data set of size 19 has a correlation coefficient of r= -0.432. Test the significance of r at the 5% level, and at the 1% level.
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exam Other Question

A projectile's height (h), in feet, as a function of time (t), in seconds after launch, is h(t)=_16t^2+80t

a. At what times will the projectile bo on the ground?
I have ( solve by completing the square. 4x�+2x-3=0