7. Jose's mother is trying to decide whether or not she should buy a 12 ounce package of coffee on sale for $7.50 or the same coffee for $9.00 per pound. Which is the better buy?
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8. In question 7 what is the price per ounce for the $9.00 coffee?
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Pls help :/

7. She should choose the $9 coffe because its cheaper per ounce.

9. 57 cents

Step-by-step explanation:

$7.50/12 ounces = 63 cents

$9/16 ounces = 57 cents

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