A chemist mixed 5 mL of Solution A with every 3 mL of Solution B to make a new solution with a new concentration. Which ratio of mL of Solution A to ml of Solution B will make
new solution with the same concentration? 6.4C
O A 13:20
OB 6:4
C 40:26
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Determine whether the set of whole numbers is closed under addition. explain why the set is or is not closed. give an example.

Determine the mean and variance of the random variable with the following probability mass function. f(x)=( 729divided by 91) (1 divided by 9) superscript x baseline comma x equals 1,2,3 round your answers to three decimal places (e.g. 98.765).

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.