To make lemonade, 2 cups of lemon juice are mixed with 7 cups of water. a) How many cups of lemon juice do you need if you have 28 cups of water?
b) What is the ratio or lemon juice to water if you have 56 cups of lemonade?

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?

Ascientist has discovered an organism that produces five offspring exactly one hour after its own birth, and then goes on to live for one week without producing any additional offspring. each replicated organism also replicates at the same rate. at hour one, there is one organism. at hour two, there are five more organisms. how many total organisms are there at hour seven? 2,801 19,531 19,607 97.655

If a is a nonzero real number then the reciprocal of a is