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Natali
1 day ago
9

Identify the 19th term of a geometric sequence where a1 = 14 and a9 = 358.80. Round the common ratio and 19th term to the neares

t hundredth.
Mathematics
2 answers:
tester [8.8K]1 day ago
3 0
This is a geometric sequence
a_{n}= a_{1}r^{n-1}

r signifies the ratio between any two successive terms

We are provided
a_{1}=14 and
a_{9}=358.8
substitute and solve for r, since we know a_{1}=14
358.8=a_{9}= 14*r^{9-1}
358.8= 14*r^{8}
Divide both sides by 14
358.8/14= r^{8}
Take the eighth root of both sides (raising (358.8/14) to the (1/8) power)
1.5=r

sub
a_{19}= 14*(1.5^{19-1})
a_{19}= 14*(1.5^{18})
a_{19}= 20690.486320497
hudnretht
a_{19}= 20690.49

Zina [9.1K]1 day ago
3 0
An = ar^(n-1) 

<span>where, an refers to the nth term, n signifies the number of terms, r denotes the common ratio </span>
<span>a represents the first term </span>

<span>given: a = 14, a9 = 358.80, n = 9, r=? </span>

<span>an = ar^(n-1) </span>
<span>358.80 = (14)*(r)^(9-1) </span>
<span>358.80 = 14*(r^8) </span>
<span>r^8 = 358.80/14 </span>
<span>r^8 = 25.63 </span>
<span>r = 1.5....common ratio </span>

<span>to find the 19th term... </span>
<span>a19=?, n = 19, r = 1.5, a=14 </span>
<span>an = ar^(n-1) </span>
<span>a19 = (14)*(1.5)^(18) </span>
<span>a19=14*(1477.89) </span>
<span>a19 = 20 690.49...result. </span>

<span>therefore, the 19th term is 20 690.49
</span>
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