Answer:
Step-by-step explanation:
Take the log of both sides:
log(2) = t*log 1.015, so that:
log(2)
t = --------------- = 46.6 compounding periods, which is 46.6/4, or 11.6 years
log 1.015
Can't write this exponential equation as a logarithm; instead, CAN write it in logarithmic form.
For this case we have the following expression:

We eliminate the parentheses taking into account that:

We add similar terms:

Different signs are subtracted and the sign of the major is placed:

Finally, the expression is reduced to:

Answer:

Option B
2a+7a+8b-12b-12-1 9a-4b-13