Please I need your help on this.

Determine whether the set of whole numbers is closed under addition. explain why the set is or is not closed. give an example.

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

Segment wx is shown explain how you would construct a perpendicular bisector of wx using a compass and a straightedge