If this is for E2020 the answer is
D)<span>No, his value of </span><span> should be positive because an even exponent indicates a positive value.
thats why it was wrong</span>
Combine like terms:
-12 + 5a - a - 6a + 8a + 8 + 3a

5a - a = 4a
4a - 6a = -2a
-2a + 8a = 6a
6a + 3a = 9a
-12 + 8 = -4
Answer

Step-by-step explanation:
the formula to calculate a circumference is

(consider x as the diameter)
so I'll be noting the circumference as C alongside the circle's ranking
a.

b.

c.

hope I helped
Answer:
D. 3y + 1
Step-by-step explanation:
Answer:
2278
Step-by-step explanation: