Consider the following two expressions, the only difference being the presence or absence of parentheses. expression 1: expression 2: 3x2(3x)2 calculate the difference between the two expressions when x = 3; that is, evaluate both expressions then subtract one value from the other.

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.