Substance A decomposes at a rate proportional to the amount of A present. It is found that 10 lb of A will reduce to 5 lb in 4.1 hr. After how long will there be only 1 lb left? There will be 1 lb left after hr. (Do not round until the final answer. Then round to the nearest whole number as needed.)

Can balloons hold more air or more water before bursting? A student purchased a large bag of 12-inch balloons. He randomly selected 10 balloons from the bag and then randomly assigned half of them to be filled with air until bursting and the other half to be filled with water until bursting. He used devices to measure the amount of air and water was dispensed until the balloons burst. Here are the data

Suppose the total income in dollars from a machine is given by the following. I= 10e0.5t, 0sts 6, tin hours Find the average income (in dollars) over this 6-hour period. (Round your answer to the nearest cent.) $