Radium-226 is a metal with a half-life of 1600 years. If you start with 1 kilogram of radium-226, how much will remain after 20,000 years?

Which of the following situations involves testing a claim about a single population proportion? Group of answer choices A certain prescription allergy medicine is supposed to contain an average of 245 parts per million (ppm) of a certain chemical.

In (triangle) ABC, the measure of angle A is 30 degrees and the measure of angle B is 64 degrees. In (triangle) DEF, the measure of angle D is 30 degrees and the measure of angle F is 86 degrees. Which statement about the triangles is true? 1.

2x+y=8 and y=x-7 solving systems by substitution

Write 6 with denominator 3

If a train takes 40 minutes to travel from town a to town b what is its speed in kilometers per minute

5 (a + 6) = 1. 5a - 30 2. 5a+6 3. 5a+30 4. a+30

Complete the solution of the equation. find the value of y when x equals 9 3x 4y=43

Corresponding sides of similar triangles are A opposite B proportional C equals

Find the inverse of A (r) = 15+3r

What is the 7 described as in 2 x 5 + 7 (3 + 13) ?