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OpenStudy (condor34):
Find the sum of a 10-term geometric sequence when the first term is 3 and the last term is 59,049 and select the correct answer below. answer choices: 177,147 88,572 88,575 177,144
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OpenStudy (anonymous):
an=a1⋅rn−1
OpenStudy (anonymous):
an=3⋅rn−1
OpenStudy (anonymous):
a10=3⋅r9
OpenStudy (anonymous):
59049=3⋅r9
OpenStudy (anonymous):
59049/3=r9
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OpenStudy (anonymous):
19683=r9
OpenStudy (anonymous):
r=3
OpenStudy (anonymous):
S10=3(1−310)1−3=88572
OpenStudy (condor34):
can you help me with another?
OpenStudy (anonymous):
sure
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OpenStudy (condor34):
Evaluate S5 for 400 + 200 + 100 + … and select the correct answer below. answer choices: 25 775 1,125 500
OpenStudy (anonymous):
so the rate is 1/2 every time
OpenStudy (condor34):
and that is s sub 5 or 2_5
OpenStudy (anonymous):
so the last two numbers are 50 and 25
OpenStudy (anonymous):
so 400 + 200 + 100 + 50+25
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OpenStudy (anonymous):
775
OpenStudy (condor34):
thanks
OpenStudy (anonymous):
yea np
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