Step-by-step explanation:
step 1. a polynomial must have whole non negative exponents
step 2. A, B, D have negative exponents
step 3. C is a polynomial.
Answer:
The speed of the wind is 
Step-by-step explanation:
Let
x-----> the speed of the wind in mph
we know that
Downwind

-----> equation A
Upwind

----> equation B
equate the equation A and the equation B

Answer:
0 is the answer
Step-by-step explanation:
4-4=0
7-7=0
Answer:
3 gray cats
Step-by-step explanation:
Write and solve an equation of ratios:
3 calico 1 gray
------------ = ------------
9 calico g
Cross multiplying, we get
3g = 9, or g = 3
They have 3 gray cats.