How many permutations of a 7-digit phone number exist, assuming that numbers may be repeated and any number 0-9 may be used for any digit? A10 to the 7th power
B10!/3\!
C10!
D70

Write the expression in simplified radical form. show all steps and work including any foil method work. (hint: use the conjugate. no decimal answers.) (9-2√3)/(12+√3)

If the scale factor between two circles is 2x/5y what is the ratio of their areas?

Tom is the deli manager at a grocery store. he needs to schedule employee to staff the deli department for no more that 260 person-hours per week. tom has one part-time employee who works 20 person-hours per week. each full-time employee works 40 person-hours per week. write and inequality to determine n, the number of full-time employees tom may schedule, so that his employees work on more than 260 person-hours per week. graph the solution set to this inequality.