Which expression should you multiply the numerator and denominator of 3 sqrt 3 / 3 sqrt 2x by to rationalize the denominator

Pls , the question is in the picture!

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base

Answer asap ill give ! ’ a sample of radioactive material decays over time. the number of grams, y , of the material remaining x days after the sample is discovered is given by the equation y = 10(0.5)^x. what does the number 10 represents in the equation? a. the half-life of the radioactive material, in days b. the amount of the sample, in grams, that decays each day c. the time, in days, it will take for the samples to decay completely d. the size of the sample, in grams, at the time the material was discovered