Final answer:
The tens digit of an integer n between 100 and 900 is the second digit from the right. Understanding the place value of digits in integer numbers helps determine the tens digit, similar to shifting decimal points in scientific notation.
Step-by-step explanation:
When considering an integer n between 100 and 900, we aim to identify its tens digit. To do that, we must understand how integer numbers are structured. An integer such as 123 is composed of digits placed in specific places: the '1' is in the hundreds place, '2' is in the tens place, and '3' is in the ones place. Therefore, for any integer between 100 and 900, the tens digit is the second digit from the right.
To relate it to converting numbers to scientific notation, we shift the decimal point in a decimal number to end up with a value between 1 and 10 (N), and based on how many places the decimal point has moved, we determine the exponent n, which might be positive or negative (10^n). This is similar to isolating the tens digit by focusing on the position of the number within the larger integer.
Numbers are made up of a combination of digits, 0 through 9. When they are presented without a visible decimal point (such as 123), the decimal point is understood to be at the far right of the number (123.). To relate this to scientific notation, if we express 123 in scientific notation, it becomes 1.23 x 102.