Dose c+2 increase or decrease or stay the same

Any is very appreciated! (picture is provided below)not sure how to do this at all won't lie

Find the area of a parallelogram with base 15 yards and height 21 2/3

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