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Work Shown:

r = 3 radius

pi = 3.14 approximately

C = 2*pi*r circumference

C = 2*3.14*3

C = 18.84

C = 19

After rounding to the nearest whole number, the circumference is approximately 19 cm.

Final answer is 5/6.

Step-by-step explanation:

Given that you roll a standard six sided number cube.

Now we need to find about what is the probability of rolling a prime number or a number greater than 3.

Total numbers in a six sided cube = 6 {1,2,3,4,5,6}

Total prime or numbers greater than 3 in a six sided cube = 5 {2,3,4,5,6}

Hence probability of rolling a prime number or a number greater than 3 = [favorable number of events] / [total possible events] = 5/6

Hence final answer is 5/6.