7100 dollars is placed in an account with an annual interest rate of 5%. To the nearest tenth of a year, how long will it take for the account value to reach 26400 dollars ?

After the principle amount value will reach to .

Step-by-step explanation:

Given that,

                 Principle Amount

                 Rate of Interest %

                 Total Amount

If Principle Amount , Time , Rate of Interest %

when interest is compounded annually:

Total Amount after

Now,

     ⇒

     ⇒

     ⇒

taking log both sides, we get

     ⇒

     ⇒

    ⇒

Therefore,

After the principle amount value will reach to .

u = -(6/7)w

step-by-step explanation:

place all values with 'u' on one side of the equation.

4u + 8w = - 3u + 2w

4u + 3u = 2w - 8w

further simplify the equation by solving the addition and subtraction.

7u = - 6w

make 'u' the independent variable by placing its co-efficient on the right-hand side.

u = - (6/7)w

step-by-step explanation:

the answer is 128