Use the quadratic formula to solve the quadratic equation.
x2 + x = 12

What basic trigonometric identity would you use to verify that sin x cos x tan x =1-cos^(2)x?

Which one is the correct answer, and why?

40 points. given: two congruent angles ∠c and ∠r are supplementary. prove: ∠r and ∠c are both right angles. it doesn't have to be exactly 10 rows.statements reasons1. 1. 2. 2. 3. 3. 4. 4. 5. 5. 6. 6. 7. 7. 8. 8. 9. 9. 10. 10.