The half-life of an isotope is 1000 years. A 50-gram sample of the isotope is sealed in a box. How long will it take until all of the original sample of the isotope is gone?

Fatima plans to spend at least $15 and at most $20 dollars on sketch pads and pencils. if she buys 2 sketchpads, how many pemcils can she buy while staying in her price range? fatima can buy between and pencils. ? (type whole numbers. use ascending? order.)