The sum of the real numbers x and y is 11. their difference is 5. what is the value of xy? explain how you got your answer.

(1)x+y=11        given
(2)x-y=5           given
x=5+y              equality property of addition (add y to both sides of (2)
5+y+y=11         sub previous result in to (1)
2y=6                algebra and simplificatiuon
y=3                   division property of equality (divide both sides by 2)
x=8                    again sub previous into (1)

20000 as first it increases by 2500 then by 5000 so next it will increase by 10000

The answer would be b ! explanation: the formula for sa *surface area * is 2×l×w+2×l×h+2×w×h so in this case l=4w=12h=8so you use the formula to solve it and it give you the answer of 352^cm^2