The triangles are similar. what is the value of x?

X=16 because 12 divided by 3 equals 4 meaning to get x you must multiply the smaller numbers by 4. Meaning 4 times 4 equals 16.

First step is to get rid of the square root. remember that a square root is the same as raising to the (1/2) power. see below: multiply exponents per exponent rules to get: remember you subtract exponents from the denominator and add exponents in the numerator so: simplify further: so a is the correct choice. if you don't understand this google exponent rules and it will you understand. look at the image results.