The temperature was -5oF and then fell 8oF.

The temperature increased by 13 degrees Farenheit.

Step-by-step explanation:

8 - (-5) = 13

Imagine we have a number line we start at -5 then add 5 to get to zero and then 8. We went up 13 spaces, since 5+8 equals 13.

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y=mx+b is the final answer!   : )

the answer is:

the correct option:

b.

to solve the problem, we need to remember how to operate to simplify exponential expressions using the logarithms.

we are given the equation:

then, using placing logarith with base 7 on both sides of the equation, we have:

so, rounding the obtained result to two decimal places (nearest hundreth), we have:

hence, we have that the correct option:

b.

have a nice day!