Answer:
D. 
Step-by-step explanation:
The expression is:
* 
For the first term: When a term with an exponent is inside parentheses with another exponent on the outside, the two exponents are multiplied by each other:
6 * 3 = 18
Now the expression looks like this:
* 
Any number to the power of zero is 1.
So the equation now looks like this:
* 1
After you multiply the two terms, you end up with
.
Answer:
The opposite of -78 is (78).
Step-by-step explanation:
If positive is the opposite of negative then -78 is +78.
Answer:
85%
Step-by-step explanation:

Answer:
A , B, D
Step-by-step explanation:
YX is the segment joining points Y and X and is defined (A)
∠ XYZ is the angle between XY and YZ and is defined (B)
∠ YXZ is the angle between YX and XZ
However there is no segment joining XZ ← not defined
YW is the segment joining points Y and W and is defined (D)