19. x^2+16x+64
=(x+8)^2
21. x^2-10x+25
=(x-5)^2
8x+20=3x+45
5x+20=45
5x=25
x=5
Answer:
14.2 in
Step-by-step explanation:
If two tangent segments to a circle share a common endpoint outside the circle, then the two segments are congruent.
Each vertex is a common endpoint outside the circle so we can relabel the figure as shown below...
so ..the perimeter of the polygon is:-
hope it helps...
have a great day!!
The sequence is the following. 23+12=35, 35-18=29, and 29+12=41