PX and QY are altitudes of the acute triangle PQR, and Z is the midpoint of PQ. How do you prove that triangle XYZ is isosceles?

In trapezoid efgh, m∠gfe=63∘. identify m∠ghe. !

Identify one charcteristic of exponential growth

Alistair has 5 half-pounds chocalate bars. it takes 1 1/2 pounds of chocalate,broken into chunks, to make a batch of cookies. how many batches can alistair mke with chocalate he has on his hand?