.HELP ME PLEASEE IM IN AN EXA Billy was asked to solve 3^5∙3^4. He got 9^20. What error did he make? *

a) When he multiplies exponents, he is supposed to add the base and the exponent
b) When he multiplies exponents, he is supposed to multiply the base and keep the exponents
c) When he multiplies exponents, he is supposed to keep the base and add the exponents if the base is the same
d) None of the above

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.