PLZ

What is the number of possible outcomes if two marbles are picked out of a bag that contains three red marbles and three blue marbles? [Note: Order does not matter.]
A) 2
B) 3
C) 4
D) 6

When turned about its axis of rotation, which shape could have created this three-dimensional object?

Find the domain and range of the following function f(x) = 51x - 21+ 4

How many liters of peroxide should be added to 12 liters of an 8% peroxide solution so that the resulting solution contains 16% peroxide?   original added new amount of peroxide 0.96 liters x 0.96 + x amount of solution 12 liters x 12 + x 0.18 liter 1.14 liters 1.92 liters 2.10 liters