Simplify the following expression:
-13^2=?

The volume of a sphere is increased by 6%. calculate the corresponding percentage increased in it area.

Ab based on the given diagram, if m_1 = 60° then m 2 = 30 60 90 180

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.