Question
Asked Dec 21, 2019
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Find the sum. 8+7.2+6.4+5.6+.............+(-45.6)

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Expert Answer

Step 1

It is required to calculate the sum of:

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. +(-45.6) 8+ 7.2+ 6.4 +5.6+..

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Step 2

Since the above series is arithmetic and the common difference (d) is -0.8, the first term is 8 and the last term is -45.6.

Calculate the number of terms to find the sum.

The formula to calculate nth term is:

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a, = a+(n-1)d

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Step 3

Now, put the values to calcu...

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-45.6 = 8+(n-1)(-0.8) -45.6-8=(n-1)(-0.8) -53.6 = (n-1)(-0.8) 53.6 :=n-1 0.8 67+1=n n=68

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