angle a and b are supplementary angles. angle where a = 30+2x and b =x what is the measure of b degrees

This is what i found “an explicit formula designates the nth term of the sequence, as an expression of n (where n = the term's location). it defines the sequence as a formula in terms of n. this example is an arithmetic sequence(the same number, 5, is added to each term to get to the next term).” i hope this you for what your looking for. can you plz mark me brainliest?

Ithink it’s b because it say 3 plastic rings and all the balls

The answer would be -3.9> -4.5