Please help I will mark you brainlest and give you 30 point!!

F(x)=x/2-2 and g(x)=2x^2+x-3 find (f+g)(x)

The length of a shadow of the building is 36m. the length of the pole, which is perpendicular to the ground, is 1.9m. the length of the pole's shadow is 1.52m. what is the height of the building?

What is the value of n in the equation -1/2(2n+4)+6=-9+4(2n+1)