How do I do math? My math teacher is teaching my algebra class to fast, he goes over the problems to fast.

Lorenzo ate 2/5 of his bag of almonds. his 4 friends ate equal shares of the remaining bag of almonds?

Leo has b boxes of pencils. each box contains 6 pencils. he has a total of 42 pencils. the equation that represents this situation the value of b that makes the equation true the first one is b+6=42,6b=42,b=42+6,or 42b=6 the second one are 7,836 48

Sam claims that cos x =sin y if x and y are congruent angels. is sam correct ?