Yes it is because the each element in the domain corresponds to exactly one element in the range.
14➗ 420. 14 goes into 42 , 3 times subtract bring down the zero and your answer is 30
Answer: C— 9 m
Steps:
a^2 + b^2 = c^2
12^2 + b^2 = 15^2
144 + b^2 = 225
b^2 = 81
b = 9