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Helpful source:
https://percent-calc.com/what-is-9-of-15000
Answer:
he cut 5 strings to pull it out
-6*3 =-18
11*4=44
-18/44. Reduce. Divide top and bottom by 2
-9/22
Answer: Choice A
S9 = (9/2)*(2+26)
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The formula is
Sn = (n/2)*(a1+an)
where
Sn = sum of the first n terms (nth partial sum)
n = number of terms
a1 = first term
an = nth term
In this case,
n = 9
a1 = 2 (plug in n = 1 into the formula an = 3n-1 and simplify)
an = a9 = 26 (plug n = 9 into the formula an = 3n-1 and simplify)
So,
Sn = (n/2)*(a1+an)
S9 = (9/2)*(2+26)
will help us find the sum of the first 9 terms of this arithmetic sequence
Answer:
1)24
2)15
3)5
4)48
Step-by-step explanation:
