Use signed numbers to solve. a helicopter descended 1200 feet, rose 800 feet, and then descended 450 feet. what was the net gain or loss in altitude? a. lost 2450 ft b. lost 850 ft c. gained 850 ft d. gained 2450 ft

2y= 3 2 x−2 y = − 1 3 x + 1 y=− 3 1 x+1

Asquare has a side that measures 11 units. what is the area of a circle with a circumference that equals the perimeter of the square? use 3.14 for π, and round your answer to the nearest hundredth. 1519.76 units2 379.94 units2 616.56 units2 154.14 units2

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.