At a bake sale, leslie sold 2 1/2 dozen sweet rolls. christie sold sweet rooms but did not keep track of what she sold. she started with 5 dozens sweet rolls and had 1 2/3 dozen left at the end of the sale. who sold more sweet tools? how many more did she sell

In need of in the diagram, ∠abc is a right angle. ∠dbc = 30°27'40". find the measure of ∠abd.

The probability that a student graduating from suburban state university has student loans to pay off after graduation is .60. if two students are randomly selected from this university, what is the probability that neither of them has student loans to pay off after graduation?

Monitors manufactured by tsi electronics have life spans that have a normal distribution with a standard deviation of 1800 hours and a mean life span of 20,000 hours. if a monitor is selected at random, find the probability that the life span of the monitor will be more than 17,659 hours. round your answer to four decimal places.