If a • b > 0 and a < 0, what must be true about b?

12. the amount of money in a bank account decreased by 21.5% over the last year. if the amount of money at the beginning of the year is represented by ‘n', write 3 equivalent expressions to represent the amount of money in the bank account after the decrease?

Asap! i'm not good math and i'm lost.

Look at triangle wxy what is the length (in centimeters) of the side wy of the triangle?