What is the smallest value of y in the solution set to the system of equations below y=x^2+6x-9?

If a and b are the measures of two first quadrant angles and sin a = 4/9 and sin b = 2/5 find sin(a+b).

Find the solution set of this inequality. select the correct graph. |8x+16|> 16

When you are making a circle graph by hand, how do you convert a number for a part into its corresponding angle measure in the circle graph? when you are making a circle graph by hand, what should you do if one of your angle measures is greater than 180°?