Pg. 18 for angles and triangles

Find the value of the cosine for angle a

The vertex of this parabola is at (-2,-3). when the x-value is -1, the y-value is -5. what is the coefficient of the squared expression in the parabola's equation?

Which value of m will create a system of parallel lines with no solution? y = mx - 6 8x - 4y = 12