X=11, set 10x+5x+15=180
15x+15=180, subtract 15 from 180= 165, then divide 165 by 15
Answer: option d.
Step-by-step explanation:
To solve this problem you must keep on mind the properties of logarithms:

Therefore, knowing the properties, you can write the expression gven in the problem as shown below:

Then, the answer is the option d.
Mode means the popular number.The mode is 13.Answer is choice number three .
The other person is wrong on the bottom.
When adding the numbers and dividing how many numbers there are is called Mean.
I already learned this in school.
Answer:
Step-by-step explanation: