Identify the 7th term of the geometric sequence in which a2 = 324 and a4 = 36.
1 answer:
Answer:
a7=4/3 or a7=-4/3
Step-by-step explanation:
using the geometric sequences formula
an=ar^n-1
a2=ar
a4=ar³
when a2=324 and a4=36
324=ar...........(1)
36=ar³............(2)
from equation (1) a=324/r substitute in equation (2)
we have :
36=324/r *r³
36=324r²
r²=36/324
r²=1/9
r=±1/3
substitute when r=±1/3 in (1)
324=a(±1/3)
a=±972
so the 7th term is
when r=±1/3
we have
a7=ar^6
a7=±972(±1/3)^6
a7=972/729
a7=4/3 or a7=-4/3
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A is Correct
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Answer:
1400
Step-by-step explanation
First I made a list of all of the first 7 carriages, so that's 125, 150, 175, 200, 225, 250, and 275. After adding those you get 1400.
X/y?
So I’m assuming x divided by y will give you your slope
T= trumpets
S= saxophones
T= s-10
S= 3t
Solve for t first in first equation by substituting the second equation into the first equation like this .
T=3t-10
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Now substitute your t answer to second equation to find s .
S=3(5)
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So you have 5 trumpets and 15 saxophones .
I hope this helps
Answer:
I think A
Step-by-step explanation:
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