The circumference of a redwood tree trunk is 16π ft, and it is 100 ft tall. what is the approximate volume of the redwood tree trunk?
a.2,560π ft^3
b.640π ft^3
c. 25,600π ft^3
d.6,400π ft^3

Kathy spent 5/8 of her money on books and another 1/6 of her money on stationeries.what fraction of kathy’s money was left?

Prove that 16^4-2^13-4^5 is divisible by 11.

Suppose a laboratory has a 30 g sample of polonium-210. the half-life of polonium-210 is about 138 days how many half-lives of polonium-210 occur in 1104 days? how much polonium is in the sample 1104 days later? 9; 0.06 g 8; 0.12 g 8; 2,070 g