Answers

2016-02-16T20:49:15+08:00
As far as I know, the length of the diagonals of a rectangle is congruent. Therefore, we'll have this equation: 5x - 11 = 2x + 25

5x-11=2x+25\\5x-2x=25+11\\  \frac{3x}{3} = \frac{36}{3} \\x=12

Then, substitute.
5(12)-11=2(12)+25\\60-11=24+25\\49=49

So, the answer is 49 (units).

Please, kindly correct me if I'm wrong. 
^-^
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How could someone correct something that is so right? :-)
Hehehe ^-^