In a class of 28 students, 21 have a brother and 9 have a sister. There are 7 students who have a brother and a sister. What is the probability that a student chosen
randomly from the class has a brother and a sister?

What two consecutive odd integers have a sum of -28

Ricky takes out a $31,800 student loan to pay his expenses while he is in college. after graduation, he will begin making payments of $190.66 per month for the next 30 years to pay off the loan. how much more will ricky end up paying for the loan than the original value of $31,800? ricky will end up paying $ more than he borrowed to pay off the loan.

Moira has a canvas that is 8 inches by 10 inches. she wants to paint a line diagonally from the top left corner to the bottom right corner. approximately how long will the diagonal line be?