What is the simplified form of the expression 16/81^2?

How long will it take for carbon 14 to decay to 10 % of it's original amount

The mass of a an atom of helium is 6.65 x 10^-24. Use scientific notation to express the mass of 250 helium atoms. A) 1.6625 x 10-21 B) 1.6625 x 10-22 C) 1.6625 x 10-24 D) 1.6625 x 10-26

There are 57 people and i want everyone to have a slice of cake and i want to pay as little as possible and I want them to be the same size so I have 20cm of cake that can serve12 people costs 13.

Jackson pays $18 per month for his phone service, plus $0.07 for each long distance minute used. Which of the following correctly describes the y-intercept?

Which of the following polynomials is prime and cannot be factored? A x (2) + 9x B x (2) + 9 C x (2) - 9 D 2x (2) + 7x-9

Isabel drove 603 miles in 9 hours. At the same rate, how many miles would she drive in 7 hours?

Liam is setting up folding chairs for a meeting. If he arranges the chairs in 8 rows of the same length, he has 9 chairs left over. If he arranges the chairs in 6 rows of that same length, he has 21 left over. How many chairs does Liam have?

10 A person is selected randomly. What is the probability that the person was born on a Sunday? * 14.3% 20% 80% 85.7%

according to a recent study 8 out of every 500 americans are vegetarions in a group of 350npeople about how many would be vegetarion

Jack works in a supermarket. He earns $186 a week. How much does he earn in a 52 week year?