the answer is d.
10100-1100 is 9,000.
12 months× 4 years= 48 months
9,000÷48= 187.5
15x+40=-47+27
15x+40=-20
15x=-60
X=-4
The change of base formula allows you to write a logarithm in terms of logarithms with another base. It follows this pattern,

where a≠1 and b≠1
Assigning the base to be 7,

I hope I was able to answer your question. Have a good day.
Answer:
x = 8/3
Step-by-step explanation:
6x + 4 = 3x + 12
3x + 4 = 12
3x = 8
x = 8/3