The grand canyon is approximately 29 kilometers long. mariner valley is a canyon on mars that is approximately 212 kilometers long. about how many times longer is mariner valley than the grand canyon? a. 2 b. 23 c. 221 d. 2108

Jackie purchased 3 bottles of water and 2 cups of coffee for the family for $7.35. ryan bought 4 bottles of water and 1 cup of coffee for his family for 7.15. how much does each bottle of water cost? how much does each cup of coffee cost?

Molly shared a spool of ribbon with 12 people. each person received 3 feet of ribbon. which equation can she use to find r, the number of feet of ribbon that her spool originally had?

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.