What is the determinant of D=[-4 3 ][-7 6]? -24 -3 3 45

The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?

Find the zero function by factoring (try to show work) h(x)=-x^2-6x-9

5, 6, 10 question: a. determine whether the side lengths form a triangle. (explain your reasoning) b. if it is a triangle, determine whether it is a right, acute, or obtuse triangle. (show your work)