HELP ASAP PLEASE ILL MARK BRAINLIEST

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

Given that ot =5, xt=12, and ox= 13 is xy tangent to circle o at t? explain.

How do i start to solve? would appreciate a walk-thru! a bird sitting 16ft above the ground in an apple tree dislodges an apple. after how many seconds does the apple land on the ground? (assuming that no branches will interfere with it's fall)