Pls answer this with an explanation if you can pg3 Pt 10, 11 10 points you don't have to explain but it would help

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

Aiden buys two bags of chips at $1.09 each and a 20 ounce soda for $1.20 at the gas station.he knows that the state tax is 5.5. how much change will he receive from a $5 bill?

The number of fish in a lake can be modeled by the exponential regression equation y=14.08 x 2.08^x where x represents the year