Tr(n)*2 I NEE HELP ASAP

What is the approximate circumference of the circle shown below?

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

Someone answer asap for ! michele pushes a box d meters across a floor. she uses a force f, in newtons, to push the box. she pushes the box for t seconds. the formula p = fd/t calculates the power, p, in watts, that it takes for michele to complete the task. solve the formula for d.