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?

If 90° < θ < 180° and cotθ = -1/3, then cscθ =

You eat 8 strawberries and your friend eats 12 strawberries from a bowl. there are 20 strawberries left. which equation and solution give the original number of strawberries?

One integer is 8 times another. if the product is 72, then find the integers