1.D 2. A 3.C 4.D
1 Is the monomial as it only contains one expression.
2. Is the difference of squares because something squared minus something squared.
3. Is standard because it is of the form

4. We know D is the not the monomial simply because its power is negative which means it does not fit the definition of a polynomial.
C) 18 because you could get 6 numbers with red, 6 numbers with brown and 6 numbers with yellow.
Answer:
-10 3
-9 4
-8 5
-3 10
Step-by-step explanation:
.........
The answer is 4.5, since 1 & 8 are in the middle you add those two numbers and divide by two so 1+8=9 and 9/2=4.5