Answer:
A
Step-by-step explanation:
A. Here is why:
In a function, each x maps to exactly one value of y.
In B and C, x = -3 maps to both -1 and 2, is they are not functions.
The answer is D. meter, second
You would want to measure the speed with distance/time, and D is the only answer with both a distance measurement and a time measurement
The answer is 2 and 8.5 over 10.