What LCM of 9 and 21

Carbon-14 is an element which loses exactly half of its mass every 5730 years. The mass of a sample of carbon- 14 can be modeled by a function, M, which depends on its age, t (in years).

Sally was able to drive an average of 21 miles per hour faster in her car after the traffic cleared. She drove 45 miles in traffic before it cleared and then drove another 36 miles.

If an atom had a nucleus one foot in diameter, what would be the diameter of the atom in miles?

Write a double fact you can use to find the sum 2+3

No more than 40 pounds of fertilizer is needed to adequately cover your backyard. Let f = the amount of fertilizer needed.

Brianna's teacher asked her which of these three expressions are equivalent to each other 9x - 3 x - 4, 12x - 4, 5x + x - 4

I am the only number between 41 and 49 that has 5 as a factor. what number am i?

Solve the proportion: A printer can print 11 color pages in 2 minutes. How many color pages can the printer print in 7 minutes?

Four is three less than

What is equal to 8/20