On saturday the librarian noted that a total of $85.00 was collected in library fines. Three times as much money was collected in the moring as in the afternoon. How much money was collected in the afternoon. How much money was collected during each part of the day?

m∠vru = 80°

m∠urw = 15°

step-by-step explanation:

c

step-by-step explanation:

16 is the absolute value

step-by-step explanation:

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