If a, b, c is an arithmetic sequence then a + c = 2b
a = 5, b = 9, c = 15
subtitute
a + c = 5 + 15 = 20
2b = 2 · 9 = 18
20 ≠ 18
Answer: The sequence 5, 9, 15 is not an arithmetic sequence.
Answer:
44
Step-by-step explanation:
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After 6 days equation would be and answer

to represent before 6 days just put 4^5=1024
Making some calculation the change si 25.57%
MCE = 360 - (150 + 70 + 50)
mCE = 360 - 270
mCE = 90
<CDE = 1/2(mBE + mCE)
<CDE = 1/2(150 + 90)
<CDE = 1/2(240)
<CDE = 120
answer
<CDE = 120°