Step-by-step explanation:
1) -9 = 9 true/false
the answer is false because negative and positive quite unlike in terms.
2) -(-21) = -21
Using the symbols multiplication rule,
Where,
<h2>
+ × + = +</h2><h2>
- × - = +</h2><h2>
- × + = -</h2><h2>
+ × - = -</h2>
Therefore, -(-21) = +21 = 21
⟼ 21 = -21 
The polygon is reflected across the line y = 2 and rotate 360 clockwise about (2,4). Then the correct option is B.
<h3>What is a transformation of a point?</h3>
A spatial transformation is each mapping of feature space to itself, and it maintains some spatial correlation between figures.
The polygon is given below.
The polygon is reflected across the line y = 2 and rotate 360 clockwise about (2,4).
Then the correct option is B.
More about the transformation of a point link is given below.
brainly.com/question/27224339
#SPJ1
3x-21=57
3x=21+57
3x=78
Divide by 3
X=26
1 way is 1 and 1/3 per person for gummies worms
C because both equations make -8