You and your friend are selling magazine subscriptions for a fundraiser. After tu weeks, you have sold (2w +9) subscriptions and your friend has sold (6w+ 3) subscriptions
a. Write an expression in simplest form that represents the difference between the number of subscriptions your friend has sold and the number you
have sold
An expression is
b. After 9 weeks, your friend has sold more subscriptions than you

Your friend has sold 4w more coupons .

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