Why is it important to use significant digits to round the answer

Can 3 and 3/5 also be rewritten as 3 and 15/20?

What is the Pythagorean theorem of 9in and 12in triangle

Humma has 3 apples. she slices each apple into eights. how many 1/8 apple slices does she have?

Each side of a rectangle is increased in length by 20%. What is the percentage increase in the area?

Is 90 cm less than 9 mm

Ethan has $150. He wants to buy 4 identical bouquets of flowers but he needs to have at least $20 left after buying the flowers.

A librarian has weekend off and has 10 paid vacation days per year

A country's population in 1990 was 132 million. In 1998 it was 137 million. Estimate the population in 2003 using the exponential growth formula. Round your answer to the nearest million.

Simplify 7x + 2y - 3x - 5y

The staircase has treads that are 10 inches deep with 7 inch high risers. If the staircase needs to reach a total height of 8 feet, 2 inches. How much floor space needs to be allowed for the staircase?