exam Maths Puzzle Numerical Ability

I need help to perform the indicated operation

f(x)=x+2 g(x)=x2 -1

I need to find (g of)(x)

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exam Other Question

if an object is thrown upward with an initial velocity of 64 feet per second from a height of 80 feet, then the height in feet t seconds after it is thrown is given by the function f(t)=-16t^2+64t+80
how long after it is thrown will it hit the ground? solve for t: 15t^2-11t=12

a. 4/5 and -3/5
b. 3/4 and -4/3
c. 4/3 and -3/5
d. -4/5 and -3/5