PLS HELP FOR BRAINLIST! Look at picture below and please solve. If possible, it would be great if you could show your work! TYSM!

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

Evaluate the expression for the given value of the variable. ∣-4b-8∣+∣-1-b^2 ∣+2b^3 ; b=-2

Kendra had twice as much money as kareem. kendra later spent $8 and kareem earned $6. by then,the two had the same amount of money. how much money did each have originally?