The radioactive substance uranium-240 has a half-life of 14 hours. The amount \( A(t) \) of a sample of uranium-240 remaining (in grams) after \( t \) hours is given by the following exponential function. \( A(t)=2400\left(\frac{1}{2}\right)^{\frac{1}{14}} \) Find the initial amount in the sample and the amount remaining after 30 hours. Round your answers to the nearest gram as necessary. Initial amount:

13. \( s-2<4 \) 15. \( 8+n \geq 2 \) 17. \( m-4 \geq-2 \)

3. A saltwater solution for an aquarium calls for 35 parts salt to 1000 parts water. Tareq used 7 tablespoons of salt and 200 tablespoons of water.

a) \( f(x)=\left\{\begin{array}{ll}\frac{|x-2|}{x-2} & \text { si } x \neq 2 \\ 0 & \text { si } x=2\end{array}\right\} \)

Suppose you found a CD that pays \( 3.7 \% \) interest compounded monthly for 3 years. If you deposit \( \$ 11,000 \) now, how much will you have in the account in 3 years? (Round to the nearest cent.) \( \$ 12336.34 \) What was the interest earned? (Round to the nearest cent.) EII Now suppose that you would like to have \( \$ 20,000 \) in the account in 3 years. How much would you need to deposit now? (Round to the nearest cent.) \( \$ \)

A monetary system in which paper money and coins are backed by gold. Fed Standard Gold Standard Bitcoin All of the Above