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fgiga [73]
2 years ago
6

Using the quadratic formula to solve x2 + 20 = 2x, what are the values of x?

Mathematics
1 answer:
never [62]2 years ago
7 0

Answer:

 the answer is D 1+ /19;

Step-by-step explanation:

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S_5= 42.5

EXPLANATION

The general term of the arithmetic sequence is

a_n=1+\frac{5}{2}n

For the first term,we substitute n=1 to get,

a_1=1+\frac{5}{2}\times 1

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a_5=1+\frac{5}{2}\times 5

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The sum of the first n-terms is given by the formula,

S_n=\frac{n}{2}(a_1+l)

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S_5= \frac{5}{2} (3.5 + 13.5)

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S_5=42.5



We could have also used the formula,

S_n=\frac{n}{2}(2a_1+(n-1)d)

S_5=\frac{5}{2}(2(3.5)+(5-1)2.5)

S_5=42.5
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