Astudents cost for last semester was $2100. she spent $420 of that on books. what percent of last semesters college cost was spent on books?

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)

Three people are traveling and need to exchange the currency of their native country for the currency of the country they are visiting. drag each exchange to the category that shows the ratio of currencies in that exchange.

Aline passes through the point (–7, 5) and has a slope of 1/2 which is another point that the line passes through?