If the circumference of the circle above is 37.68 units, what is the area? Use = 3.14. Circumference=2piR
Area=piRsqaured

A.
113.04 units2
B.
75.36 units2
C.
18.84 units2
D.
1,419.78 units2

If 20% of a number is 35, what is 50% of that number?

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 a. at what time does the particle reverse direction? b. when is the displacement positive? (round one decimal place and answer in interval notation) c. when is the displacement negative? (round one decimal place and answer in interval notation) d. when is the particle’s acceleration positive? (round one decimal place and answer in interval notation) e. when is the particle’s acceleration negative? (round one decimal place and answer in interval notation)

Aculture started with 4,000 bacteria. after 5 hours, it grew to 5,200 bacteria. predict how many bacteria will be present after 19 hours. round your answer to the nearest whole number.