What is the meaning of pemdas dont search up

I've never been good at math he told he loves but he keeps cheating on me, so it ain't adding up sis

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

Aword processing program requires a 7- digit registration code made up of the digits 1,2,4,5,6,7 and 9 each number has to be used and no number can be used mor than once how many codes are possible