Alberto is making a budget. he owes a cell phone bill of $60 per month for 23 more months, plus the fees for any extra usage such as text messaging or extra minutes. which of the following is the correct category for this expense? a. essential (flexible) expenseb. emergency fundc. essential (fixed) expensed. non-essential expense

Answer A on Edge/E2020

i definitely got this question right on the test.

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

they would have to work 32 hours.