This is not a function. The input 7 in set A maps to outputs -1 and -3 at the same time in set B, which is why we don't have a function.
For a function to be possible, each input must map to exactly one output only.
Answer:
a) 
b) 
Step-by-step explanation:
a) The similarity ratio is given by;

This implies that:

This simplifies to:

Take positive square root:


Therefore the similarity ratio is:

b) This time the size are in volumes: We still use the same approach. But this time:


Take cube root:
![{k} = \sqrt[3]{\frac{2197}{729} }](https://tex.z-dn.net/?f=%7Bk%7D%20%20%3D%20%20%20%5Csqrt%5B3%5D%7B%5Cfrac%7B2197%7D%7B729%7D%20%7D%20)

The similarity ratio is

15% of 80 = 0.15 x 80 = 12
answer
12 is 15% of 80
Answer: 64/3
Step-by-step explanation: