exam Maths Puzzle Numerical Ability

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 (

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exam Other Question

Find two consecutive odd positive integers such that the twice the square of the larger minus the square of the smaller is 41. Set up an algebraic equation and solve for the two numbers. CONSIDER THE FOLLOWING GRAPH OF Y=F(X). THE GRAPH I HAVE HAS DOT FOR THE "P" ON -1 ON THE Y AXIS.
A. If h(x)=F(x)-3, what is the coordinates of P be after the shift? give answer