Nuclear decay occurs according to first-order kinetics. Cobalt-60 decays with a rate constant of 0. 131 years–1. After 5. 00 years, a sample has a mass of 0. 302 g. What was the original mass of the sample?.

Abag contains even and odd numbered balls in the ratio of 3: 7, respectively. for each of the following, what is the probability of drawing an even-numbered ball? the total number of balls is 240 and 30 of the odd-numbered balls are renumbered by multiplying the numbers by 4.

What are the two main purposes of edgar allen poe’s, “the masque of the red death? ”

Layer r contains a well-known index fossil that is 100 million years old. based on this information and the principle of superposition, a. layers t and m are older than 100 million years, and layers x and g are younger than 100 million years. b. layers t, m, x, and g are all older than 100 million years. c. layers t and m are younger than 100 million years, and layers x and g are older than 100 million years.