16 - b = -3.5 b = what is b I really need help

Abacteria population is tripling every hour. by what factor does the population change in 1/2 hour? select all that apply

Asunflower was 20 1/2 inches tall. over the next 6 months, it grew to a height of 37 inches tall. what was the average yearly growth rate of the height of the sunflower? ? plz write a proportion to solve i will give you 100 points

Sawsan recorded the favorite sport of students at her school. she surveyed 200 students. how many students chose tennis?