Help me plz pizzazz take all my points

What is the value of x? enter your answer in the box. photo attached.

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

Which term best describes the association between variables a and b? no association a negative linear association a positive linear association a nonlinear association a scatterplot with an x axis labeled, variable a from zero to ten in increments of two and the y axis labeled, variable b from zero to one hundred forty in increments of twenty with fifteen points in a positive trend.