Question

Mr. Duncan mixed 0.00055 pounds of sulfur and 0.00104 pounds of iron powder in a test tube before heating it. What is the total weight of the mixture in the test tube?

Answer 1

1.59 × 10-3 pounds

Explanation:

Add the weights of the sulfur and iron powder to find the total weight of the mixture.

First, write both numbers in scientific notation.

Now that both numbers are written in scientific notation, compare the exponents. Since both exponents are not the same, rewrite 5.5 × 10-4 as 0.55 × 10-3. Now the numbers multiplied by the powers of 10 can be added while keeping the power of 10 the same.

So, the total weight of the mixture in the test tube is 1.59 × 10-3 pounds.

Answer 2

We add 0.00055+0.00104 together.

0.00104+0.00055= 0.00159

I hope this helps!