2-10 = -8 I'm not sure what the 5,6,7,8,9,10 means if you tell me i might be able to help you
Answer:
7 + (B÷5) = 3
Step-by-step explanation:
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:
57 × 10 will give you 5700, as well as 285 × 20.
The answer should be:
20.875
Hope this helps.
