"5 times a sum of 12 and a number is 80" translates to the next equasion:
5 x (12+a) = 80
Now we just have to solve it to find the value of a.

The unknown number is 4.
D is the right answer.
are you sloving the x? or what are you sloving
I would say 4.875
Hope this helps
Answer: C
Step-by-step explanation:
The correct answer is C), find the reading at |-80| degrees below the 110 mark.
We start at the first number, 110. We go 80 degrees below it to find our answer, since we are adding a negative number.