The solution is n = –2 verified as a solution to the equation 1.4n + 2 = 2n + 3.2.
what is the last line of the justification?
a. 0.8 = 0.8
b. –0.8 = –0.8
c. 3 = 3
d. –3 = –3

B. –0.8 = –0.8

Step-by-step explanation:

Let's first show that the solution is n = -2

Given 1.4n + 2 = 2n + 3.2.

Collecting like terms

1.4n - 2n = 3.2 - 2

-0.6n = 1.2

n = 1.2/-0.6

n = -2

To get the last line of justification, we will substitute n = -0.2 into the original equation

1.4n + 2 = 2n + 3.2.

1.4(-2) + 2 = 2(-2) + 3.2

-2.8 + 2 = -4 + 3.2

-0.8 = -0.8 (B)

you didn't post any answer choices, so its not 100% clear what your teacher is looking for

however, log(15/7) is equivalent to log(15) - log(7)

i'm using the rule log(x/y) = log(x) - log(y)

the answer is 13/48

step-by-step explanation: