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?

Find all solutions of the equation 2 cosine squared theta plus 9 cosine theta minus 5 equals 0 , in the interval [0,2pi ).

a pizzaeria had 7 cans of tomato sauce. how many pizzas could they make if each pizza takes one ninth of a can?

What does X equal. If the area is 12 units.

Solve for 2. Write the smaller solution first, and the larger solution second. (x + 1) (3x + 4) = 0

Which is less 4 quarts or 1 gallon

How many grains of wheat should be placed on square 13?

Can you solve for x 6y=24-3x

A rectangular prism has a height of 12 cm and a square base with sides measuring 5 cm. A pyramid with the same base and the height of the prism is placed inside the prism. What is the volume of the space outside the pyramid but inside the prism?

Which unit of measure would be the most appropriate to measure the capacity of a bottle of nail polish?

A city of 100,000 people is growing at a rate of 5.2% per year. Assuming this growth rate remains constant, estimate the population of the city 5 years from now.