Lance wrote the number 4,953. then he wrote a number with a 9 digit that is 100 times the value of the 9 in 4,953.

the answer is 4953 * 100 which is equal to 495300

The Number written by lance = 4,953

Face value of ,9 in 4953 = 9

Place value of , 9 in 4953 = 9 × 100=900

So, the number could be

1. 100 × Face value of , 9 in 4,953 = 100 × 9=900

2. 100  × Place value of , 9 in 4,953 =100 × 900=90,000

10.8109 amu

Step-by-step explanation:

The average atomic mass of boron is determined as the average of the atomic masses of both isotopes weighed by their respective abundances.

Therefore, the average atomic mass is given by:

The average atomic mass of boron isotopes is 10.8109 amu.