Cesium-137 has a half life of approximately 30 years. How much of a 40 g sample would be left after 90 years?

A. 14.33 g

B. 6.31 g

C. 32.49 g

D. 5 g

E. 26.67 g

Find the mass and center of mass of the S solid bounded by the paraboloid z = 6x2 + 6y2 and the plane z = a (a > 0) if S has constant density K. Use cylindrical coordinates.

What is the value of f if f + I-3 11/12 = 18

Last month, Maria purchased a new cell phone for $500. The store manager told her that her new cell phone would depreciate by 70% every 6 months. Maria thinks she will want to replace her phone after a while.

Solve this equation 2cos^2x-9cosx-5=0

T=4st/s-t what is the value of s when t = 5 and T = 40?

382.993 rounded to the nearest hundredth?

Their sum is 7, and their product is 15

Which expression has the same value as - 18: (-9) -18:2 -12: (-3) -10:5 -8: (-4)

Jim uses ribbon for bookmarks. Jim has 9 feet of ribbon. He uses 1/3 foot of ribbon to make each bookmark. What is the total number of ribbons Jim can make from 9 feet of ribbon?

At a car repair shop, the cost of a repair depends on the time the mechanic works. Which of the following shows this idea expressed in Function notation?