Question

Select all numbers that ARE in scientific notation.




Select all numbers that ARE in scientific notation.




0.3 x 10⁵


5 x 10⁻⁸


67.8 x 10⁻¹⁵


7.9 x 10¹⁰


16.2 x 10¹⁴

Answer 1

To identify which numbers are in scientific notation, we look for the form \( a \times 10^n \), where \( a \) is a number (the coefficient) that is typically between 1 and 10 (inclusive of 1 but exclusive of 10) and \( n \) is an integer (the exponent).

Let's examine each number:

1. **0.3 x 10⁵** - This is **not** in proper scientific notation, as the coefficient (0.3) is less than 1.
2. **5 x 10⁻⁸** - This is in proper scientific notation, as the coefficient (5) is between 1 and 10.
3. **67.8 x 10⁻¹⁵** - This is **not** in proper scientific notation, as the coefficient (67.8) is greater than 10.
4. **7.9 x 10¹⁰** - This is in proper scientific notation, as the coefficient (7.9) is between 1 and 10.
5. **16.2 x 10¹⁴** - This is **not** in proper scientific notation, as the coefficient (16.2) is greater than 10.

So, the numbers that ARE in scientific notation are:

- **5 x 10⁻⁸**
- **7.9 x 10¹⁰**