Can someone help me with this? (20 points if answered) And I will mark the 1st one with brainliest because you have a fat and beautiful brain :)

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

Diane’s bank is offering 5% interest, compounded monthly. if diane invests $10,500 and wants $20,000 when she withdrawals, how long should she keep her money in for? round to the nearest tenth of a year.

Which has the greater energy, light of wavelength 519 nm or light with a frequency of 5.42 x 10^8 sec^-1?