Help please, i have to get these delta maths right.

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

Find an bif a = {3, 6, 9, 12) and b = {2, 4, 6, 8, 10).

Acaterer charges $500 plus $30 per guest to cater a wedding. walt and traci don't want to spend more than $8000 on catering. write and solve an inequality in terms of the number of guests, g, that can be invited. a) 30g ? 8000; g ? 267 b) 500g < 8000; g < 16 c) 500 + 30g < 8000; g < 250 d) 500 + 30g ? 8000; g ? 250