100 POINTS IF U GET THIS RIGHT!

The sum of the squares of two numbers is 8 . the product of the two numbers is 4. find the numbers.

Consider u = {x|x is a negative real number}which is an empty set? o {x|x eu and x has a negative cube root}o {x|x eu and x has a negative square root}{x|x eu and x is equal to the product of a positive number and -1}{x|x eu and x is equal to the sum of one negative and one positive number?

If the formula (formula in picture) were used to find the r-value of the following data, what would be the value of to three decimal places?