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gtnhenbr [62]
3 years ago
5

Solve for x: 2 over 5 (x - 4) = 2x

Mathematics
1 answer:
xeze [42]3 years ago
5 0
\frac{2}{5}(x-4)=2x^{(5} \\\\ 2(x-4)=10x \\\\ 2x-8=10x \\\\ 2x-10x=8 \\\\ -8x=8 \ |:8 \\\\ -x=1 \\\\ \boxed{x=-1}
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2
svet-max [94.6K]

Answer:

 B.  4200

Step-by-step explanation:

A suitable calculator can add the terms for you. (See attached)

__

The first term is 69, and the common difference is 75-69 = 6. The general term is ...

  an = a1 +d(n -1)

  an = 69 +6(n -1)

Then the 28th term is ...

  a28 = 69 +6(27) = 231

The average term is (a28 +a1)/2 = (231 +69)/2 = 150.

The sum is the number of terms multiplied by the average term:

  sum = 28×150= 4200

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