Find the sum of the first 20 terms of an arithmetic sequence with a first term of -14 and a comman difference of 4

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

Afarmer has a large field that is x feet in length. he wants to fence in a rectangular section in the middle of the field , leaving a length of 100 feet of open field behind each end of the fenced rectangle. he also wants the width of the fenced-in space to be 100 feet less than its length. find the expressions to represent the length and width of the fenced section of the field

If a flying disk is 139 meters in the air and travels at an average of 13 m/s how long is it in the air