Answer:
all real numbers
Step-by-step explanation:
the domain will always be all real numbers
Answer:
1) x = 15
Step-by-step explanation:
We use the Pythagorean thm for these questions. Where a and b are the legs (So order doesn't matter), and where c is the hypotenuse
1)
a² + b² = c²
9² + 12² = x²
81 + 144 = x²
x² = 225
You square root each side so you can get rid of the exponent on x.

x = 15
Answer:
52
Step-by-step explanation:
Paying off a debt over time with planned payments, so kind of like mortgage on a house.