None of them are correct.
You have to isolate the variable by dividing each side by factors that don't contain the variable.
And when you do so you get a closed point starting at positive 8 and an extending ray to positive infinity and a closed point at -15 with a ray extending to negative infinity on the number line so none of them are correct.
Answer:
Factors of 42: 1, 2, 3, 6, 7, 14, 21, 42.
hope this helps good luck
N /(n*10^n)
So 3 would be
3/(3×1000)=1/1000=.001
