Substance A decomposes at a rate proportional to the amount of A present. a) Write an equation relating A to the amount left of an initial amount A0cafter time t.
b) It is found that 8g of A will reduce to 4g in 3hr. After howling will there be only 1g left?

Assume that the weights of quarters are normally distributed with a mean of 5.67 g and a standard deviation 0.070 g. a vending machine will only accept coins weighing between 5.48 g and 5.82 g. what percentage of legal quarters will be rejected? round your answer to two decimal places.

Manny bought 12 pounds of vegetables at the supermarket. 75% of the vegetables were on sale. how many pounds of vegetables were not on sale? 98 points : )

Explain how to graph a scatterplot and its regression line using a regression calculator.