Arectangular plot of land is to be fenced in using two kinds of fencing. two opposite will use heaven duty fencing selling for $3 a foot and the remaining two sides use standard fencing selling for $2 a foot. what are the dimensions of the rectangular plot of greatest area that can be fenced in at a cost of $6000?

Four airplanes carrying a total of 400 passengersarrive at the detroit airport. the airplanes carry, respectively,50, 80, 110, and 160 passengers.a) one of the 400 passengers is selected uniformly at random.let x denote the number of passengers that were on theairplane carrying the randomly selected passenger. find var(x)for x as given in the problemb) one of the 4 airplane drivers is also selected uniformly atrandom. let y denote the number of passengers on the chosen driver’s airplane. find var(y) for y as given in the problem

Can someone factor this fully? my friend and i have two different answers and i would like to know if either of them is right. you in advance. a^2 - b^2 + 25 + 10a

What is the missing reason in the proof? segment addition congruent segments theorem transitive property of equality subtraction property of equality?