Reglas de la potenciacion

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.

There are 45 questions on your math exam. you answered 810 of them correctly. how many questions did you answer correctly?

In the equation sqrt(n+5)-sqrt(11-10)=1. what is the value of n