Suppose laboratory has a 26-gram sample of polonium-210.the half-life in polonium-210 is about 138 days.
a. How many half-lives of polonium-210 occur in 276 days?
b. How polonium is left in the sample after 276 days?

Adrawer contains 12 identical white socks, 18 identical black socks and 14 identical brown socks. what is the least number of socks you must choose, without looking, to be certain that you have chosen two socks of the same colour?

Ok a point t on a segment with endpoints d(1, 4) and f(7, 1) partitions the segment in a 2: 1 ratio. find t. you must show all work to receive credit.

What number is 7 units left of -15?