What would be the standard notation of 6.3x10^-3

On average, how many more hits will he get when he bats 100 times at home during the day as opposed to 100 times away at night?

The magnitude, m, of an earthquake is defined to be m=log l/s, where i is the intensity of the earthquake (measured by the amplitude of the seismograph wave) and s is the intensity of a “standard” earthquake, which is barely detectable. what is the magnitude of an earthquake that is 1,000 times more intense than a standard earthquake? use a calculator. round your answer to the nearest tenth.

What is the sum of these mixed numbers 4 2/3+ 3 1/9