Surface area and volume of a castle secondary math shop 2016

Abag contains 3 red marbles 4 white marbles and 5 blue marbles if one marble is drawn from the bag what is the probability that the marble will be blue

He that is measured at 220° is a reflex angle. the opposite angle is obtuse. find the measure of obtuse .

He mass of a single atom of carbon can be found by dividing the atomic mass (12.01 g) by 6.022 x 10^23. which is the mass of a single carbon atom, correctly written in scientific notation with the correct number of significant figures?