How would i solve 7r=-7/2? i know the answer is -1/2 i just don't understand how to get -1/2 as my answer.

The volume of a cube-shaped shipping container is 13,824 cubic inches. find the edge length of the shipping container.

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.

Will give a: 122 b: 90 c: 48 d: 180