Combine like terms in the given polynomial. Then, evaluate for x = - 2, y = - 3. 2xy + 3x – 4y² + 2xy? – 3xy? – x​

Arace is 10 kilometers long.markers will be placed at the beginning and end of the race course and at each 500 meter mark.how many markers are needed to mark the course for the race?

Check image and write the letter of the answer

How to square the standard deviation? how do you get the bottom number so you can actually square it? for instance, 22/6 squared is 1.91, where did they get the 6 from?