What are the numbers less than -7 and greater than -15?

Identify the initial amount a and the growth factor b in the exponential function. a(x)=680*4.3^x

What is the sum of 25x + 15y and (-18x - 6y)

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