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Triangle RST has a perimeter of 21 feet. What is the value of x?
5 points

A.x = 2
B.x = 3
C.x = 4
D.x = 5

1 Answer

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Choice D is the correct answer.

Step-by-step explanation:

The perimeter of a shape is just the sum of all the sides. Therefore, if the perimeter is 21 ft, we can set up the following equation:

(x) + (x + 2) + (x + 4) = 21

Now solve out the equation!

3x + 6 = 21

3x = 15

x = 5

Therefore, the correct answer is choice D.

Hope this helps!
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