one side of a rectangle is 3 yards longer then twice the other side. if the perimiter is 27 yards, what is the lienghth of the other side

Name each raycalculation tip: in ray "ab", a is the endpoint of the ray.

How to do this , and can some one explain

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