Iam stuck on how to simplify this expression 20(−1.5r+0.75)

What is the solution to the equation? k/6.4=8.7 2.3 5.568 15.1 55.68

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.

The height of a plant, in inches, p years after planting it is given by the polynomial function r(p) = -2p% + 270p. find the height of the plant when p = 90 years.