That is the system we usually use to write number, in which each place-value is worth ten times more than the place-value to its right.
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The denary, or base 10, equivalent of 22 expressed as a number is 4.
A decimal is a way of representing a number in base 10. 5280 is already expressed in base 10 and so the answer is 5280 feet!
It is a number expressed in "standard form".
Numbers expressed using exponents are called powers. When writing a number expressed as an exponent, the number is called the base.
It is: 7.0*10-9 when in scientific notation