Answer:
We can write the given numbers in regular notation as it follows:
4.20x10^-4: 0.000420
9.1x10^-2: 0.091
4.20x10^6: 4200000
6.21x10^3: 6210
Step-by-step explanation:
The question requires us to convert the numbers given in scientific notation to their correspondent regular notation.
When a value is written in scientific notation, it means we used a number from to 1 to 10 multiplied by a power of 10. To change from scientific notation to regular notation, we simply need to multiply the number given by the power of 10 given. A simple way to see it is that we need to "move" the decimal point: when it is multiplied by a power greater than 0, we "move the decimal point" to the right, when it is multiplied by a power smaller than 0, we move the decimal point to the left.
Also, it is important to keep the same amount of significant figures when changing from scientific to regular notation.
Considering the information above, we can write the given numbers in regular notation as it follows:
4.20x10^-4: 0.000420
9.1x10^-2: 0.091
4.20x10^6: 4200000
6.21x10^3: 6210