Help please I have A D- in Math and I need to get this done
2 answers:
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Answer:
The sum is
Step-by-step explanation:
we know that
The formula of the sum in a geometric sequence is equal to
where
a1 is the first term
r is the common ratio
n is the number of terms
we have
a1=-4, a2=24, a3=-144
Find the value of r (common ratio)
r=a2/a1
r=24/(-4)=-6
so
a1=-1
r=--6
n=6
substitute in the formula