The number 1953 R8T9 467 is a valid card number when verified by the Luhn Algorithm. R and T are each single digits of the number such that R is less than T. Determine all possible values of R and T.

Ya i could just need to know what type of math

Look, when you want to do something like put it like x^2. x2 could mean x² or x₂. so to clear confusion, know the notation. to find the product multiply the x's and you get -8x and the y's and you get 6y. since it's all being multiplied it is just -8x6y, or answer a. although the better answer is -48xy(combining -8 and 6) because you should multiply constants whenever you can.