Leanne earned $400 and $550 in interest the last 2 years. how much interest must she earn this year so that her average earnings over the three year period is more than $600

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).

Lizette is training for a marathon. at 7: 00 she left her house and ran until 8: 30, then she walked until 11: 30. she covered a total distance of 18 miles. her running speed was six miles per hour faster than her walking speed. find her running and walking speeds in miles per hour.

If my mom gets $13.05 an hour, and she works from 3: 30 to 10: 45 in the morning, how much money does my mom make?