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PLEASE HELP URGENT ! what is the 7th of the geometric sequence where a1 = 3 and a5 = 768
 one year ago
 one year ago
PLEASE HELP URGENT ! what is the 7th of the geometric sequence where a1 = 3 and a5 = 768
 one year ago
 one year ago

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amistre64Best ResponseYou've already chosen the best response.1
nothings THAT urgent :/
 one year ago

amistre64Best ResponseYou've already chosen the best response.1
we should start by remembering the general formula for a geometric sequence
 one year ago

amistre64Best ResponseYou've already chosen the best response.1
we know a1, and we know the value when n=5; from this we can grab the r value
 one year ago

amistre64Best ResponseYou've already chosen the best response.1
can you fill those in for me?
 one year ago

amistre64Best ResponseYou've already chosen the best response.1
give it a try, ill know if its right or not :)
 one year ago

kiara23Best ResponseYou've already chosen the best response.0
the answer is going to be 3,072
 one year ago

amistre64Best ResponseYou've already chosen the best response.1
it might be, but lets see if we can build up to that
 one year ago

amistre64Best ResponseYou've already chosen the best response.1
lets fill in what we are given: a1 = 3 and a5 = 768 when n=5 an = a1 * r^(n1) a5 = 786 = 3 * r^(51) 786/3 = r^(4) 292 = r^(4) , 4rt the whole thing to find r 4rt(292) = r as is this is not a possible sequence to me. an even root can be negative across the reals
 one year ago

amistre64Best ResponseYou've already chosen the best response.1
an even root canNOT .... i passed typing class, honest :)
 one year ago

amistre64Best ResponseYou've already chosen the best response.1
check your problem and make sure you havent got an error in the post
 one year ago

amistre64Best ResponseYou've already chosen the best response.1
i got a feeling the a1 = 3 for this to work like you want it to
 one year ago

amistre64Best ResponseYou've already chosen the best response.1
4rt(292) = r then this is what we get for r take the general formula again, knowing this r and n=7 a7 = 3 * (4rt(292))^(6) and a calculator should popout your intended results
 one year ago

amistre64Best ResponseYou've already chosen the best response.1
a7 is going to be a negative value
 one year ago

amistre64Best ResponseYou've already chosen the best response.1
adjust for a mismath and i get: a7 = 3 * 256^(6/4) = 12288 , so yes
 one year ago

kiara23Best ResponseYou've already chosen the best response.0
can you help me with thi one ? What is the sum of the geometric sequence 4, 28, 196 ?
 one year ago

amistre64Best ResponseYou've already chosen the best response.1
why did you think that the answer "is going to be 3,072"?
 one year ago

amistre64Best ResponseYou've already chosen the best response.1
ah, itll prolly be best to post up a new question with that sum in it; i have to go for now
 one year ago
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