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sesenic [268]
2 years ago
12

-6 3/5 - (-7 4/15) + 2 1/5

Mathematics
1 answer:
Ilya [14]2 years ago
3 0

Answer:2.87

Step-by-step explanation:

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One example is the equation:

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Find Sn for the arithmetic series 5+7+9 + … and determine the value of n for which the series has sum 165.
SVETLANKA909090 [29]

Answer:

see explanation

Step-by-step explanation:

the sum to n terms of an arithmetic sequence is

S_{n} = \frac{n}{2}[2a + (n - 1)d ]

where d is the common difference and a is the first term

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S_{n} = \frac{n}{2}[(2 × 5) + 2(n - 1) ]

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n² + 4n - 165 = 0 ← in standard form

(n + 15)(n - 11) = 0 ← in factored form

equate each factor to zero and solve for n

n + 15 = 0 ⇒ n = - 15

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CAN YOU HELP ME WITH THIS PROBLEM??
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She will need 8 tables. Happy Thanksgiving! :D
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3 years ago
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