1) you take a test, and 60% pass the first time and 40% fail.. the second time around, 80% pass the test and 20% fail.. the third time, 90% pass and 10% fail.. a. what is the probability that you fail the 1st or the 2nd time? . b. what is the probability that you fail on the 3rd time? . c. what is the probability you fail? .

Liz is shipping a package to her friend. the maximum weight of a medium flat-rate box is 20 pounds, including the box which weighs 6 ounces. write and solve an inequality to describe the possible weight in pounds, w, of the contents that liz will ship to her friend if she must use a medium flat-rate box. use the drop-down menus to explain your answer.

How many quarts of a 50% solution of acid must be added to 20 quarts of a 20% solution of acid in order to get a 40% solution of acid?

(30 points). the population of a city is 45,000 and decreases 2% each year. if the trend continues, what will the population be aer 15 yrs