So, let’s represent the number as n:
n+7=2n+3
Subtract both sides by 3:
n+4=2n
Now by n:
2n=4
Divide:
n=2
The number is 2
You already know that y equals -4. It says that x equals 3, so multiply the -4 by 3 and because it has a negative number and a positive number it will equal -12. Remember anytime you see a letter after a number it means multiply. The complete problem should be -10 because 2 is a whole number you subtract it from -12. Hope that helped you out some.
Y=200x. it will take joan 8 hours to hike 1600 ft.
A priori means as things were in the beginning or at the start.
a posteriori means as things are after any event.
still follows the property of 
for any non-zero x.
Therefore, the answer is 1.
