Cho z=ln(xy+x^2)
chứng minh rằng : z''y^2-z"x^2=1/x^2

Which statements regarding the diagram are true? check all that apply.

Drag the tiles to the correct boxes to complete the pairs. match the cart-coordinates with their corresponding pairs of y-coordinates of the unit circle

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)