Mario and his friends ordered 3 pizzas. each pizza was sliced into 8 pieces. they ate 21 slices. how much pizza did they eat? write your answer as a mixed number.

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The lines shown below are parallel. if the green line has a slope of -1, what is the slope of the red line?

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.