A sample of rock is found to contain 100 grams of a parent isotope. How many grams of the parent isotope will remain after two half-lives?

Answer

50

100

75

25

Janice's mother gave her a $10 bill to buy 5 pounds each of bananas and apples at the grocery store when she got there she find found that bananas for $.80 per pound and apples $1.40 per pound. Did Janice's mother give her enough money?

Each class at Briarwood collected 54 cans of food if there are 29 classes in the school what was the least number of cans collected

Nora has a piece of ribbon that is 3/4 yard long. she will use half of it to make a bow what length of the ribbon will she use for the BOw?

Shanna writes the formula f (x 1) = 2.5f (x) when f (1) = 2 to represent this sequence: 2, 5, 12.5, 31.25, ... which error did shanna make?

What is bigger 2/5 or 2/8

Aubrey's dinner cost / $85$85. She tips the waitstaff 30/%30% for excellent service.

Tony had a certain number of stamps that were each worth $0.15. He misplaced 7 stamps. He found that the total value of his stamp collection was now $5.55.

The figure below shows a rope that circles the Earth. The radius of the Earth is 6371 kilometers. Assuming the rope makes a perfect circle, what is the length of this rope? Give your answer in terms of pi.

Thomas ran a mile in 8 minutes at this rate how many minutes did it take them to run 3/4 of a mile

Which expression is equivalent to (6n - 5) - (2n - 3) ? (A) 8n - 8 (B) 8n - 2 (C) 4n - 8 (D) 4n - 2