First term: a1 = 151
common difference: d = -14 (we decrease by 14 each time, eg, 151-14 = 137)
nth term of this arithmetic sequence is...
an = a1+d(n-1)
an = 151+(-14)(n-1)
an = 151-14n+14
an = -14n+165
This will be used in the formula below
Sn = n*(a1+an)/2
<span>Sn = n*(151+(-14n+165))/2
</span><span>S26 = 26*(151+(-14*26+165))/2 ... replace every n with 26
</span>S26 = -624
The final answer here is choice C) -624
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that's correct, what you've put in the boxes. :)
The correct answer is E because the first thing you need to do is distribute.
Answer:
14.7%
Step-by-step explanation:
GIVEN: Felicia bought a jackhammer priced at 
. The total price, including sales tax, was 
.
TO FIND: What was the sales tax percentage.
SOLUTION:
Price of jackhammer 
Total price including sales tax 
Total sales tax on jackhammer 
Total sales tax percentage 
Hence the total sales tax percentage on jackhammer is 14.7%
