Answer:
Step-by-step explanation:
x^2+8x+15
=x^2+(5+3)x+15
=x^2+5x+3x+15
=x(x+5)+3(x+5)
=(x+5)(x+3)
Answer:
7740 degrees.
Step-by-step explanation:
The sum of the exterior angles of all polygons add up to 360 degrees.
So the number of sides and the number of interior angles in this polygon = 360 / 8 = 45.
Each internal angle = 180 - 8 = 172 degrees, so the sum of all interior angles
= 172 * 45
= 7740 degrees,
A20-a18=a1+19d-a1-17d=2d =281-97
so
d=92
-8.70833333333 about but you can round to the nearest tenth (-8.7) or nearest whole number (-9)
