What is the center of the circle given by the equation x2 + y2 + 18x – 32y +4= 0?

(98 points) i need with 5 questions. answer definitions are welcomed, but not necessary.

Factor completely. 4p^2 + 36p + 81 express the answer in the form (ap + b)^2

You are on a cycling trip around europe with friends. you check the weather forecast for the first week. these are the temperatures for the week. sun mon tues wed thurs fri sat 16°c 20°c 24°c 28°c 28°c 23°c 15°c what is the mean temperature forecast for the week?