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Sara Dixon
Mathematics
23 March, 02:03
What is the 5th term of this sequence?
a1 = - 3, an = - 2a n-1
+4
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Abigayle
23 March, 02:13
0
32
Step-by-step explanation:
an = a1 + (n - 1) d
a5 = 32=a1 + 4d
a10=57 = a1 + 9d
57=a + 9d
32=a + 4d
25=5d
A) d=5
32=a1 + 4*5
B) a1=12
57=a1 + 9*5
57=a1+45
B) 12=a1
an = a1 + (n - 1) d
an = 12 + 5 (n - 1)
an = 12 + 5n - 5
C) an = 5n + 7
D) a22 = 5*22 + 7=117
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Chessie
23 March, 02:30
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Answer:start with an=a1 + (n-1) d
a5=a1+4d=22
a15=a1+14d=62
Therefore, subtracting
-10d=-40
d=4
a5=22=a1+16
a1=6
6,10,14,18,22, a10 is 42, a15 is 62.
an=6 + (n-1) * 4
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