Please someone help me with this question ASAP!

If f(x) = x+8 and g(x) = 4x- 3, find (f+g)(x)

Acoffee shop orders at most $3,500 worth of coffee and tea. the shop needs to make a profit of at least $1,900 on the order. the possible combinations of coffee and tea for this order are given by this system of inequalities, where c = pounds of coffee and t = pounds of tea: 6c + 13t ≤ 3,500 3.50c + 4t ≥ 1,900 which graph's shaded region represents the possible combinations of coffee and tea for this order?

How does reflecting or rotating a figure change the interior angles of the figure?