Using separation of variables solve the following wave equation problem for where and Assume that the solution has the form Calculate , , and (BE CAREFUL: and are just the functions of and . They could be something like . Any coefficient in front of them goes into . So for an answer like the goes into while the goes into . Use pi to write . If your answer includes a write it as cos(n*pi), do NOT change it to . DO change to 1 and to 0. For you can use e^x or exp(x). Keep fractions as fractions)

Simplify (a/b - b/a) times (a - a^2/a+b) a - a^2/a=b is a mixed number

The average hourly earnings for a construction worker is projected to be $24.50 in 2012. jason wants to join the construction work force after he graduates in 2012. his friend tells him that average hourly earnings for construction workers will rise by 2% from 2009 to 2012. based on the data below, assuming that the projected hourly earnings are correct, is jason’s friend’s statement accurate? construction industry - average hourly earnings, 2000-2009 a. his friend’s statement is accurate. the average hourly earnings will increase by 2%. b. his friend’s statement is not accurate. the percent increase will be more than 2% c. his friend’s statement is not accurate. the percent increase will be less than 2% d. his friend’s statement is not accurate. the average hourly earnings will decrease

Select all the correct answers. what is 221,000,000,000,000,000,000 expressed in scientific notation?