Answer:
A. 21, 16, 28
Step-by-step explanation:
1st side = x
2nd side = x-5
3rd side = x+7
x+x-5+x+7 = 65
3x + 7 - 5 = 65
3x + 2 = 65
3x = 65-2
3x = 63
63/3 = 21
x = 21
therefore, the sides are 21, 16, and 28
The answer is A.
Basically as it says, the first length is 5 more than the second and the third is 7 more than the first.
Answers A and B describe number 2
5
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x≈231.123
1) Make a ratio 314/2512= x/1584
2) Use the concept of cross multiplication and get 314*1584=2512x
3) Use Algebra:
314*1584=497,376
497,376/2152=2512x/2152