9 x 9 = 81
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A number written in standard form as 9 is simply the digit 9 on its own, without any additional decimal places or exponents. In standard form, numbers are typically expressed as a single digit followed by any necessary decimal places or exponents. Therefore, the number 9 in standard form is just 9.
It is: 7.21*10^9
9 + 0.3 + 0.05
3y = 4x + 9 -4x + 3y = 9 is the standard form
The standard form of 9 and fifteen hundredths (9.15) is 9.15 × 100