Commission Rate 4%
5%
6%
Level of Sales
First $10,000
Next $20,000
Over $30,000
I
1. Judy Wilson had sales of $32,400.

2. Marco Vega had sales of $28,000.

3. Ella Foster had sales of $45,500.

AN

5/12, or 5: 12

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

thus, the first answer choice, y = sec x, is the correct one