Can anyone with these 2 questions .. greatly appreciated

In 9, the differences between two consecutive terms are

6-3,12-6,24-12...

3,6,12...

Which is not same. So it is not is arithmetic progression .

In 10. the differences are

Which is not same, so it is not in arithmetic progression too .

the answer is:

the correct option:

b.

to solve the problem, we need to remember how to operate to simplify exponential expressions using the logarithms.

we are given the equation:

then, using placing logarith with base 7 on both sides of the equation, we have:

so, rounding the obtained result to two decimal places (nearest hundreth), we have:

hence, we have that the correct option:

b.

have a nice day!