Angle \alpha lies in quadrant II, and tan\alpha =-(12)/(5). Angle \beta lies in quadrant IV, and cos\beta =(3)/(5). What is the exact value of sin(\alpha +\beta )?

The area of a rectangle is 15+5y square feet. which of the following expressions could be the length of the sides of the rectangle, in feet a. 5 and 3y b. 5 and 3+y c. 5 and 5+y d. 3 and 5+3y

Find the multiplicative inverse of 8-12i

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)