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A die is rolled, find the probability that an even number is obtained.

I have 18 ones, 15 hundred, 15 tens, and 8 thousand. What number am I?

3. During a recent 10 years, 808,715,710 fans attended major league basketball games. What digit is in the ten millions place in 808,715,710?

The fifth grade class surveyed 144 people. They found that 1/3 of the people have umbrellas. Of the people who have umbrellas, 1/2 have black umbrellas. How many people in the survey group have black umbrellas. 

The area of a square field is 617796cm^2. Find the length of its each side.

Plz Answer StepByStep and correct.