Loraine

Suppose that scores on the Math SAT exam follow a Normal distribution with mean 500 and standard deviation 100. Two students that have taken the exam are selected at random. What is the probability that the sum of their scores exceeds 1200?

The sum of two numbers is 43.the first number is more than the second number.what are the two numbers?

Change to standard form 2x^2+4y^2-12x-64y-16=0 i don't know how to solve it.

I have only been able to find the last one maybe someone else could help..... les étudier