A. Vertical angles.
Complementary angles are adjacent angles that add to equal 90 degrees.
Adjacent angles are angles that share a side (they are right next to each other).
Supplementary angles are adjacent angles that add to equal 180 degrees.
Thus the answer is A.
Hope this helps.
This is a geometric sequence because each term is a constant multiple, called the common ratio, of the previous term. In this case the common ratio, noted as "r", is:
8/-2=-32/8=128/-32=r=-4
The first term is -2
Any geometric sequence can be expressed as:
a(n)=ar^(n-1), a=initial term, r=common ratio, n=term number.
Since we know r and a for this problem already we can say:
a(n)=-2(-4)^(n-1)
Given:
The numbers are written in scientific notation.
To find:
The standard form of given numbers.
Solution:
Formula used:

(a)



(b)



(c)



(d)



Therefore, 
.
L=W+7
W=1/3L
we can substitute the width in the first relation with 1/3L
L=1/3L+7
we move1/3L to the left
L-1/3L=7
we multiply by 3 to remove the denominator
3L-L-21
2L=21
L=21/2=10.5cm