problems

[austorior]

Josh completes a job in 4hr, but jane can do it in 3.3 hr. What is the percent difference in the total time to complete the job if Josh does it alone, and if Jane joins josh after 2hr?
-27.4

AOL reported 24million US subscribers in 2001, a doubling over the previous 2.5 years. Based on this exponential growth rate, how many subscribers are there in 2008, 7years later?
1.67x10^8

Marie starts a project at a rate to finish in 5hr. After 2hr, her rate decelerates such that she finishes 6.3 hr after starting. What was the deceleration rate, a negative number?
-0.0281

at what value of x does the slope (dy/dx) equal -3 for xy^2-5=0?
0.518

[AuSmith]