The phone company A Fee and Fee has a monthly cellular plan where a customer pays a flat monthly fee and then a certain amount of money per minute used on the phone. If a customer uses
110 minutes, the monthly cost will be $50.5. If the customer uses 1000 minutes, the monthly cost
will be $273.
A) Find an equation in the form y = mx + b, where x is the number of monthly minutes used and
y is the total monthly of the A Fee and Fee plan.
y =
Do not use any commas in your answer.
B) Use your equation to find the total monthly cost if 649 minutes are used.
If 649 minutes are used, the total cost will be
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dollars.

47 - 90 = 43

43 - 180 = x

x = 137

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

0.50 , 0.75

step-by-step explanation: