Whoever answers it's first gets the
rutherfordium- 265 is a radioactive substance that has a half-life of 13 hours. if there is a 149g sample of rutherfordium- 265 left at 12am on october 19th, approximately how much rutherfordium- 265 would remain on october 22nd at 12am?

a. 0.018 grams
b. 3.21 grams
c. 0.3 grams
d. 0.89 grams

Which number line correctly shows 0.8 + 0.3?

The height of a birch tree, f(x), in inches, after x months is shown in the graph below. how much does the birch tree grow per month, and what will be the height of the birch tree after 10 months? a. the birch tree grows 1 inch per month. the height of the birch tree will be 16 inches after 10 months. b. the birch tree grows 2 inches per month. the height of the birch tree will be 26 inches after 10 months. c. the birch tree grows 3 inches per month. the height of the birch tree will be 36 inches after 10 months. d. the birch tree grows 2 inches per month. the height of the birch tree will be 24 inches after 10 months.

Asmall book publisher knows that 26 books weigh 41 lbs. how much do 40 books weigh?