David Herbert earns $2,475 a month as a security guard for Baldwin Enterprises. His group medical insurance costs $3,300 a year. The company pays 80 percent
of the cost of group insurance. How much does david pay?

I dont think so my brain left the game

Step-by-step explanation:

80/100 x 3300 = 2640 <= company's part

3300- 2640 = 660

David pays $660

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