log10(10) + log10(100) + log10(1000) + log10(10000) + log10(100000) is equal to ?
A. 15
B. log 11111
C. log10 (1111)
D. 14 log10 (100)
Answer : A. 15
Explanation :
Here are some values to base ten represented as logarithms :
| Value | As 10 raised to a power | Log to base 10 |
|---|---|---|
| 1 | 10 0 | 0 |
| 10 | 10 1 | 1 |
| 100 | 10 2 | 2 |
| 1000 | 10 3 | 3 |
| 10000 | 10 4 | 4 |
| 100000 | 10 5 | 5 |
1 + 2 + 3 + 4 + 5 = 15
