Leo deposited $7,770.11 in an account that earned 2.5% interest compounded weekly for 13
years. after 13 years, how much had leo earned in interest?

The amount which Leo earned weekly is $10747.616

Step-by-step explanation:

Given as :

Principal deposited in account = $7,770.11

The compounded weekly rate of interest = 2.5%  

The time period of loan = 13 years

Let the amount Leo earned = A

From compounded method

Amount = Principal ×

Or, Amount = $7,770.11 ×

Or, Amount = $7,770.11 ×

Or, Amount = $7,770.11 × 1.3832

∴    Amount = $10747.616

Hence The amount which Leo earned weekly is $10747.616  Answer

the correct is answer is a 9-sided polygon!

the solution of the equation is 2.23 ⇒ answer b

step-by-step explanation:

* lets revise the meaning of exponential function

- the form of the exponential function is y = ab^x, where a ≠ 0, b > 0 ,  

  b ≠ 1, and x is any real number

- it has a constant base b

- it has a variable exponent x

- to solve an exponential equation, take the log or ln of both sides,  

  and solve for the variable

* lets solve the problem

∵

- the base is 7 and the exponent is x

- insert ㏑ in both sides

∴

- use the rule

∴ x ㏑(7) = ㏑(77)

- to find x divide both sides by ㏑(7)

∴

* the solution of the equation is 2.23 to the nearest 2 decimal places