Need help asap! Given the four rational numbers below, come up with the greatest sum, difference, product, and quotient, using two of the numbers for each operation. (Numbers can be used more than once) Show your work.
Numbers: 6.6 -4 3/5 18 1/2 -12.4
Word form since the numbers are messed up: six point six, negative four and three fifths, eighteen and one half, and negative twelve point four