Vector
use law of triangle in vector addiction

Antonia and carla have an equivalant percentage of green marbles in their bags of marbles. antonia has 4 green marbles and 16 total matbles. if carla has 10 green marbles , how many total marbles does carla have

For f(x)=2x+3 and g(x)=x^2- 8 find (f+g) (x)

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.