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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U would multiply 5/8 and -120/1 and you should get -600/8 but u have to make it into a mixed number which would be 75.
You could do x=81 with the little line on the top (represents the number going on forever, and example is 0.818181818181818181818181818818181818 etc.)
The expression which is:
3.28 + 3.28 + 3.28 = 9.84
Is simply equivalent to the expression of thrice the value
of 3.28 is equal to 9.84 or:
3 x 3.28 = 9.84
<span>The two are simply equal since in the 1st
expression there are three 3.28 and in the 2nd expression there are
also three 3.28.</span>
Absolute value can never be negative!
|-30| = 30
|-4 | = 4
| 5 | = 5
30 - 4 + 5 =
26 + 5 = 31
Hope this helped!
