q4. write 0.00000215 in scientific notation.

Explanation:

Step1: Move decimal point

Move the decimal point to the right until we have a number between 1 and 10. For 0.00000215, we move it 6 places to the right to get 2.15.

Step2: Determine exponent

Since we moved the decimal point 6 places to the right, the exponent of 10 is - 6.

Step3: Write in scientific - notation

The scientific notation is (a\times10^{n}), where (a = 2.15) and (n=-6). So the number in scientific notation is (2.15\times10^{-6}).

Answer:

(2.15\times10^{-6})