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What is the value of the 19th term in the sequence -1, -5, -9, ...? A)-77 B)-73 C)-71 D)-22
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Sep 10, 2018
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What is the value of the 19th term in the sequence -1, -5, -9, ...?
A)-77
B)-73
C)-71
D)-22
Mathematics
middle-school
Joost Diepenmaat
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Joost Diepenmaat
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The Arithmetic Sequence formula is:
an = a1 + (n-1)(d) where d is the common difference and a1 is the first term in the sequence.
a19 = -1 + (19 - 1)( -4)
a19 = -1 + (18 * -4)
a19 = -1 + (-72)
a19 = -73
LETTER B
Michael J
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Sep 11, 2018
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Michael J
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-5 -(-1) = -5+1= -4
and
-9 -(-5) = -9+5 = -4
we observe that the number are in AP
of the AP -
ist term = -1
common difference = -4
19th term = -1 + (19-1)(-4)= -1 -72 = -73
_________________________
the correct answer = B
Ferrybig
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Sep 16, 2018
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Ferrybig
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