Mount mckinley in alaska rises 20,320 feet in the air while mount kosciusko in australia rises 7,310 feet. what is the difference in the height of these mountains? express your answer in scientific notation.

Mary used 1/7 of a spool of ribbon to complete 4 projects. she used the same amount of ribbon on each project. how much ribbon did she use on each project?

Solve -2(4y + 6) = 52. 5 -5 8 -8 and !

Damon makes 20 cups of lemonade by mixing lemon juice and water. the ratio of lemon juice to water is shown in the tape diagram. lemon juice\text{lemon juice} lemon juice water\text{water} water how much lemon juice did damon use in the lemonade? cups