Which shows a correct order to solve this story problem?
each morning bree walks 1.2 miles. in the afternoon she walks 2.4 miles.
how many miles will bree have walked in 7 days?
a. step 1: multiply 1.2 by 7.
step 2: multiply 2.4 by 7.
step 3: add the two products.
b. step 1: multiply 1.2 by 2.4.
step 2: multiply the product by 7.
c. step 1: multiply 1.2 by 2.4.
step 2: divide the product by 7.
d. step 1: multiply 1.2 by 7.
step 2: multiply 2.4 by 7.
step 3: subtract the two products.

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