Write 0.003921 in scientific notation

3.921 * 10^-3

Step-by-step explanation:

First, move the decimal place until you have a number between 1 and 10. If you keep moving the decimal point to the right in 0.003921 you will get 3.921 after moving it 3 times to the right.

since you moved it three times to the right three times, the exponent will be -3.

Therefore, the solution is 3.921*10^-3

because linear equations are a lot simpler than quadratics equations, and linear equations formula is a lot easier to memorize. that's why i think they're harder.