On the basis of past experience a company has determined that its monthly sales revenue (in dollars) is related to its advertising according to the formula s = 20x + y2 + 4xy, where x is the amount spent on print advertising and y is the amount spent on cable advertising. If the company plans to spend $34,000 on these two means of advertising, how much should it spend on each method to maximize its monthly sales revenue?

A blood bank needs 9 people to help with a blood drive. 12 people have volunteered. Find how many different groups of 9 can be formed from the 12 volunteers.

Step-by-step explanation:

A blood bank needs 9 people to help with a blood drive. 12 people have volunteered. Find how many different groups of 9 can be formed from the 12 volunteers.

the answer is (4,3)

since the rule for r0, 90º is (-y,x) and it was already applied to form the image, all you have to do is reverse the answer using this formula.