Valerie used the time-to-pay-off formula to calculate how many payments it
will take to pay off a loan, and she got n = 39.34. how many payments will it
take to pay off the loan?
o
a. it will take 39 payments, because valerie should round up.
o
b. it will take 40 payments, because valerie should round up.
o
c. it will take 40 payments, because valerie should round down.
o
d. it will take 39 payments, because valerie should round down.

It will take 40 payments to pay off the loan because Valerie should round up.

Step-by-step explanation:

Valerie used the time-to-pay-off formula to calculate how many payments it would take to pay off a loan and she got, n = 39.34.

So, it will take 40 payments to pay off the loan because Valerie should round up.

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

ljn

step-by-step explanation: