A friend asks you to think of a number, double it, and then add 4. Write an algebraic expression using the variable x to describe your friend’s directions. Then find the value of the expression if the number you think of is 3

Identify the number 127 as a rational or irrational. explain

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 geometric mean of 3 and 7? a) square root of 21 b) 2 square root of 6 c) 2 square root of 7 d) 21