Answer:
Step-by-step explanation:
5p + 9c = p
9c = p - 5p
9c = -4p
c = -4p/9
c= 
Your answer would be 12/25 tons. If you set up a proportion 2/5 X
-------- = -------
5/6 1
Solve your proportion.
Number 4 would be: C
And number 5 would be: C
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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