Which statement proves that △xyz is an isosceles right triangle?

xz ⊥ xy
xz = xy = 5
the slope of xz is , the slope of xy is , and xz = xy = 5.
the slope of xz is , the slope of xy is , and the slope of zy = 7.

In triangle △abc, ∠abc=90°, bh is an altitude. find the missing lengths. ah=4 and hc=1, find bh.

Over the course of the school year, you keep track of how much snow falls on a given day and whether it was a snow day. your data indicates that of twenty-one days with less than three inches of snow, five were snow days, while of the eight days with more than three inches of snow, six were snow days. if all you know about a day is that it is snowing, what is the probability that it will be a snow day?

Which expression and diagram represent “renee biked four times as far this month as last month”?