Which of the following ratios is not proportional to the others
18 to 21, 12 to 14, 6 to 7,42 to 49,2 to 3,60 to 70,30 to 35

3(10x-y)-5(x-y^2) need this solved asap

Agreeting card company can produce a box of cards for $7.50. if the initial investment by the company was $50,000, how many boxes of cards must be produced before the average cost per box falls to $10.50?

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