Prove the schwarz inequality (for any pair of functions):
|(f, g)|≤||f||⋅||g||.
(hint: consider the expression ||f+tg||2, where t is a scalar. this expression is a quadratic polynomial of t. find the value of t where it is a minimum. play around and the schwarz inequality will pop out.)

Before simplifying, how many terms are there in the expression 2x - 5y + 3 + x?

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?

Robert plans to make a box-and-whisker plot of the following set of data. 27, 14, 46, 38, 32, 18, 21 which of the following should robert's box-and-whisker plot look like?