If 40% of a radioactive substance remains after 20 years, what is the half-life of the substance?

The public library has fewer than 4,000 books. Let b represent the number of books in the library. Which inequality describes the number of books? b < 4,000 b > 4,000 b ≤ 4,000 b ≥ 4,000

Find the domain of f (x) = x-9/x squared-81

Use the Distributive Property and simplify the expression. 9 + 4 (2x - 1) + 8 a. 2x + 20 b. 6x + 20 c. 8x + 16 d. 8x + 13

The sum of a number times 3 and 4 equals 6

Round 46 7/16" to the nearest 16th inch

14. a. Find the prime factorization of 180. b. Explain why every natural number with a zero in the ones place is a composite number.

What is the amount of carpet needed in square yards if the room is 12 feet x 15 feet?

Jessie wants to save the same amount of money each week for a trip. He needs 3,060. if the trip is 36 weeks away, how muchmoney should Jessie save each week?

I'm gonna buy a shirt on sale that was 20% less than it's original price. The original price was five dollars more than the sale price what was the original price?

Use the distributive property to simplify 2 - (-3a+4)