Find the coefficient of x^4 in the expansion of (x−9)^8
Please I need help!!

Asquare and an equilateral triangle have the same perimeter. each side the triangle is 4 inches longer than each side of the square. what is the perimeter of the square

Awoman has 14 different shirts: 10 white shirts and 4 red shirts. if she randomly chooses 2 shirts to take with her on vacation, then what is the probability that she will choose two white shirts? show your answer in fraction and percent, round to the nearest whole percent.

If a suspect is in possession of 20 grams of cocaine how many ounces does he possess what will the charge be