How many 1-foot-square border tiles do you need to surround a pool that is 10 feet long and 5 feet wide

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?

The mean of 10 values is 19. if further 5 values areincluded the mean becomes 20. what is the meanthese five additional values? a) 10b) 15c) 11d) 22

A+b= 17, ab=70, find the value of |a-b|