Jane's cell phone plan is $40 per month plus $0.15 per minute for each minute over 200 minutes of call time. if jane's cell phone bill is $58.00, for how many extra calling minutes was she billed?

she was billed for 120 extra calling minutes.

Step-by-step explanation:

$58.00 - $40.00 = $18.00

$18.00 ÷ $0.15 = 120

answer: (1,3) and (-2,0) i think.

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