You dont have to show work just write the answers plz help

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

Complete the solution of the equation. find the value of y when x equals to 1 9x-5y=29

The ivring berlin learning center would like a possible net profit of $650,000 on its new resource manual it sells to schools. the fixed costs for producing the manual are $780,000 and the variable cost per package is $19.85. if the estimated unit sales are 1,250,000 units, what selling price unit should the ivring berlin learning center try?