Mike deposited 6000 in the bank and earned 4% interest. How much interest did he earn if it was left for 18 months

1. what is the measure of ∠abc? what is the measure of ∠abd?

Aretha wanted to gather data about the cost of local bowling leagues in her area. she plotted the data and determined that the average bowling league costs consist of a one-time registration fee and a monthly fee modeled by the equation y = 15x + 20. identify and interpret the y-intercept in this model. the y-intercept is 20. this is the cost per month. the y-intercept is 20. this is the cost of registration. the y-intercept is 15. this is the cost of registration. the y-intercept is 15. this is the cost per month.

Ithink i know it but i want to be sure so can you me out ?