Answer:
15.7 cm
Step-by-step explanation:
Circle x's circumference is 15 * pi = 47.1 cm
Circle y's is 20 * pi = 62.8
The difference is 62.8 - 47.1 = 15.7
Answer:
-8a^2 + 9a
or
9a - 8a^2
the answer is c
Step-by-step explanation:
I'm not sure how you obtained -5 as your answer but this is the mathematical explanation. hope this helps!