Which of the following expressions is written in scientific notation?
A.)73.4 x 10^5
B.)0.09 × 10^7
C.)80 x 10^3
D.)4.22 x 10^–3
I think it is D.
Thank you.
I agree.
You are correct, the expression D.) 4.22 x 10^–3 is written in scientific notation.
To determine if an expression is in scientific notation, we look for two main components: a coefficient and a power of ten multiplied together. In this case, expression D has a coefficient of 4.22 and a power of ten of –3. The negative exponent indicates that the decimal point is shifted to the left three places.
Option A is not in scientific notation because the coefficient is not between 1 and 10. Option B is not in scientific notation because the coefficient is less than 1. Option C is not in scientific notation because the coefficient is greater than 10.
In scientific notation, the coefficient should always be between 1 and 10 (or -1 and -10 for negative exponents) to represent a value with one significant digit before the decimal point. Therefore, option D is the correct choice.