Perform the indicated operation. 12 ÷ (-6)

6
-72
-18
-2

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.

What is the perimeter of an isosceles triangle with each leg measuring 2x+3 and the base measuring 6x-2?

Solve the system of equations. x=-2y+1 and x+2y=9. show work