Examine the following equation. x2+8x−9=0
Using the quadratic formula, which options are solutions to the equation?

Select all that apply.

−4+7–√
−1
9
−9
−4−7–√
1

The students at jefferson middle school are raising money for a charity by selling t-shirts and hats. the number of t-shirts sold was 3 times the number of hats. the profit was $5 for each t-shirt sold and $2.50 for each hat sold. the students raised $840 for the charity. they used the system below to analyze their success and found the solution to be (144, 48). 5x+2.50y=840 x=3y how much did they earn from t-shirt sales?