Answer:
Step-by-step explanation:
I'm sorry forgot how to exactly solve it
The answer is 12.
Steps
If that number is x
(3+x)/(8+x)=3/4
"Cross multply"
4(3+x)=3(8+x)
12+4x=24+3x
x=12
To check: add 12 to 3 and 8. 3+12=15 and 8+12=20. 15/20=3/4
D
This is because the expression can be simplified to get the same result. -1+2log_4((1/4)x)
