scores on the gre? (graduate record? examination) are normally distributed with a mean of 520 and a standard deviation of 144. use the 68-95 99.7 rule to find the percentage of people taking the test who score between232 and 808.
the percentage of people taking the test who score between 232 and 808 is %.

Achemist has 200 ml of a 10% sucrose solution. she adds x ml of a 40% sucrose solution. the percent concentration, y, of the final mixture is given by the rational function: the chemist needs the concentration of the final mixture to be 30%. how many milliliters of the 40% solution should she add to the 10% solution to get this concentration?

Divide. write in the simplest form. 4 1/6 divided by 10

At the county fair, the baxter family bought 6 hot dogs and 4 juice drinks for $12.90. the farley family bought 3 hot dogs and 4 juice drinks for $8.55. find the price of a hot dog and the price of a juice drink.