## anonymous one year ago what is the perimiter if w= square root of 13 and L= 7 square root of 13 a)91 b)8 square root 13 c) 14 square root 13 d) 16 square root 13

Okay, so first you need to know the rules of multiplying square roots. They basically go as follows: $2\sqrt{7}*\sqrt{7}=2\sqrt{7*7}=2\sqrt{49}$ --> Basically you just multiply the radicand (number inside the square root) with the other one. So in your problem, the equation would look like this: $\sqrt{13}*7\sqrt{13}=7\sqrt{13*13}=7\sqrt{169}$ so the final answer is sqrt{169}