A reporter determines a baseball player betting average which is a ratio of numbers of hits to number of times at bar the result is shown on a calculator as 0.2121 write this repeating decimal as a fraction

the fraction is

In a probability experiment, karen flipped a coin 76 times. the coin landed on heads 32 times. what percentage of the coin flips resulted in tails? round to the nearest percent. a. 58% b. 65% c. 42% d. 60%

The number if marbles of different colors stored in a hat is listed below: 4 red marbles 10 green marbles 7 blue marbles. without looking in the hat, dan takes out a marble at random. he replaces the marble and then takes out another marble from the hat. what is the probability that dan takes out a blue marble in both draws?

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.