Is 1500 the same as15 hundreds? i know 15 hundred is, but they say 15 hundreds. i didn't know if there was a difference? ?

Which describes the difference between the graph of f(x)=x^2 and g(x)=-(x^2-2)

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.

Table which ratio is equivalent to 3: 7? 6: 7 3: 21 24: 56 15: 30