Is 3x + 9 = 2x + 5 have one solution, no solution or infinite solutions

Is the number 128.439 a rational number

How can you check that you have correctly converted frequencies to relative frequencies?

Ahealth-food producer has 250 samples of a new snack to distribute in the mall. the producer has to keep at least 50 samples for display in the health food for the product launch. how long will the samples last if consumers are taking the samples at a rate of 25 every hour