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:
5.01 is your answer.
Step-by-step explanation:
What you do is you have to get a by itself.
<em>15 (25 - 5a) = 4 - a</em>
<em>375 - 75a = 4 -a</em>
<em>-74a + 375 = 4</em>
<em>-74a = -371</em>
<em>a = 5.01 rounded to the nearest hundreth</em>
5.01 is your answer.
I
because 89 is an odd number
and since i is root of -1
if the exponent is odd,
the result will always be i, the base.
On the other hand, if it is even,
the result will always be -1.
