At the stop and save grocery store, an 18-ounce box of crunchy oats costs $4 59, and a 15-ounce box costs $3 99
a. which box is the better buy? explain

18 oz box

Step-by-step explanation:

4.59/18=$0.26 (rounded)

3.99/15=$0.27 (rounded)

So the 18 oz box is the better buy

The explanation is the drawings

relating to or denoting a system of numbers and arithmetic based on the number ten, tenth parts, and powers of ten.

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