What 3 parts are needed to show a number in scientific notation?
1. A whole number and a decimal, a multiplication symbol, a power of 10
2. An exponent to the 2nd power, a multiplication symbol, a whole number from 1 to 10
3. A decimal or whole number, a multiplication symbol, a power of 10
4. A decimal between 1 and 10, a multiplication symbol, a power of 10