Is the first answer correct and what's the next answer? Thanks

In which form is the following function written? y = - 2(x – 3)(x + 5)

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 weight of a rock sample is measured to be 2.5 ponds. what is the percent of error in the measurement?