Suppose a laboratory has a 61 g sample of polonium-210. the half-life of polonium-210 is about 138 days. a. how many half-lives of polonium-210 occur in 828 days? b. how much polonium is in the sample 828 days later? a. 6; 10.17 g b. 6; 0.95 g c. 6; 4,209 g d. 6; 0.48 g

You will get 25 points an image of a rectangular prism is shown below: part a: a cross section of the prism is cut with a plane parallel to the base. what is the name of the shape created by the cross section? explain your answer. (5 points) part b: if a cross section of the prism is cut perpendicular to the base, what would be the shape of the resulting cross section? explain your answer. (5 points)

The function v(r)=4/3pir^3 can be used to find the volume of air inside a basketball given its radius. what does v(r) represent

Need showing work for this problem 56.25 ×25.80