Are 8x2y and-5yx2 like terms?

How to do this , and can some one explain

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 =

Ineed to know how to write question one in mathematical terms