Answer:
147°
Step-by-step explanation:
106°+139°+126°+141°+112°+129°+x =900°
753°+x = 900°
x = 900°-753°
x= 147° (sum of the interior angles of a heptagon=900°)
Answer:
there arent
Step-by-step explanation:
Δ is negative
Answer:
the answer is D becuase it is the only one with a range of -18