Which expression is equivalent to 34 ⋅ 3−9?

Acomputer store bought a program at a cost of $10 and sold it for $13. find the percent markup

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.

The holiday party will cost $160 if 8 people attend.if there are 40 people who attend the party, how much will the holiday party cost