Look up the law of sines, I suggest Khan Academy. It is better if you know how to do it, it is very useful.
I think the answer would be 1.8
(2x² + 7x + 10) - (x² + 2x - 9) =
2x² + 7x + 10 - x² - 2x + 9 =
x² + 5x + 19
Answer:
A. 
Step-by-step explanation:
To find f(-2) in f(x)=5*3^x, plug in -2 into all the x values.
f(-2)=5*3^-2, you can use calculator to calculate 3^-2 which equals 0.1, forever 1's.
f(-2)=5*0.1=0.5 Forever 5's.
f(-2)=0.5 or 
Hope this helps!
If not, I am sorry.
Answer:
(-4,3) it is x axis -4 and y axis 3