Which congruence theorem can be used to prove △abr ≅ △rca?

What is the probability of rolling a single die greater than 4

The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $20. according to the standard deviation rule, how much did almost all (99.7%) of the students spend on textbooks in a semester?

Last one and the bottom answer choice is y=(x-4)^2+1 you guys!