Question

How we write this number scientific notation 4.2x10^-5

Answer 1

Answer: 0.0042

Step-by-step explanation: The number shown here, $4.2$ $x$ $10^{-5}$, is written in scientific notation since it's compose of a decimal between 1 and 10, in this case 4.2, and a power of ten, in this case $10^{-5}$.

To write $4.2$ $x$ $10^{-5}$ in standard notation, we first begin with 4.2.

Next, we look at the exponent, which in this case is -5.

A negative exponent means that we move the decimal point to the left.

This gives us .000042 or 0.000042.