Answer:
X=8
Step-by-step explanation:
So since an equation with unknown variable divide 7 on both sides
56/7=8
x=8
The Solution.
The given points are

The formula is

In this case,

Therefore,



Hence, the correct answer is (-1, 4) (option 3)
To solve this problem you must apply the proccedure shown below:
1. You must apply the following formula:

Where
is the future value,
is the present value,
is the interest rate and
is the time in years.
2. You have that the bank will double your money in
years. Therefore:

3. Substitute values into the formula and solve for
, as following:

4. By applying natural logarithm, you have:

%
The answer is:
%