to climb a rock wall at the fair, you must have 5 tickets. if each ticket costs$1.50,how much does it cost to climb the rock wall

What is the standard deviation of the following data set rounded to the nearest tenth? 3, 17, 18, 15, 12, 21, 9

Write the fraction 9/50 as a decimal if needed round to the nearest hundredth

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.