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

Answer:
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!