Hey can anyone help me with problem

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

How do you create a data set with 8 points in it that has a mean of approximately 10 and a standard deviation of approximately 1?

1. evaluate 8x(2)y9(-2) for x=-1 and y=2 2. simplify the equation. -() 3. simplify the expression. [tex]\frac{5}{x(-2) y9(5)}[/tex]