Mario's sock drawer contains 12 black socks and 16 white socks. Without looking, Mario takes one sock out of the drawer and then takes out another. What is the probability that he will take out two
white socks?

A.4/7x1/2

B. 4/7 x 12/27

C. 12/28 x 16/28

D. 16/28 x 15/27

Which of the following is the correct ratio for converting kilograms to grams

Solve the following simultaneous equation by using an algebraic method (either substitution or elimination) 2x + 3y=-4 4x-y=11

Scores on a university exam are normally distributed with a mean of 78 and a standard deviation of 8. the professor teaching the class declares that a score of 70 or higher is required for a grade of at least “c.” using the 68-95-99.7 rule, what percentage of students failed to earn a grade of at least “c”?