Angle b = 90°, side bc = 20, angle y = 90°, side yz = 20. what additional information would you need to prove that triangle abc is congruent to triangle xyz by hl?

How many heads would you expect if you flipped a coin twice? first, fill in the table below with the correct probabilities. hint: the sample space for flipping a coin twice is {hh, ht, th, tt}. a = b = c = f