9.2 less than 3 times a number is the same as 21 1/4. What is the number?

Enter your answer as a decimal or simplified mixed number in the box.

Which describes the difference between the graph of f(x)=x^2 and g(x)=-(x^2-2)

2x minus y equals 6, x plus y equals negative 3

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.