Because S and U are the opposite vertices of the <span>parallelogram RSTU,
so SU is a diagonal of this </span>parallelogram.
Answer:

Step-by-step explanation:
The answers are :
13) 9
14) 200
15) -10
16) -300
17) -276
18) -66
(A)
Choice (B) is not the right answer because I
it's only 3rd order. But because f(x) goes to negative infinity when x goes to positive infinity means that the right answer is (A).