Which set of angle measures could be the interior angles of a triangle? *

90º, 90º, 90º
80º, 80º, 200º
40º, 50º, 60º
15º, 30º, 135º

While scuba diving, rajeev dove to a depth of 12.6 feet below the surface of the water and then descended another 8.7 feet. what expression can be used to find rajeev's new position? 12.6 – 8.7 –12.6 – 8.7 –12.6 – (–8.7) 12.6 – (–8.7)

The center of a circle represent by the equation (x+9)^2+(y-6)^2=10^2 (-9,6), (-6,9), (6,-9) ,(9,-6)

Write numerical coefficient of y² in the expression 2x² - 15xy – 7y²