Answer: Option A: 14t + 4s
Explanation:
To find the perimeter of a shape, add up all of its side lengths. We know that the length of the rectangle is (s + 2t), and its width measures (s + 5t).
To find the perimeter, multiply the width by 2 and the length by 2 and add those expressions:
P (perimeter) = 2(s + 2t) + 2(s+5t)
P = 2s + 4t + 2s + 10t
P = 4s + 14t or 14t + 4s
Hope this helps.