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shepuryov [24]
3 years ago
9

Find the sum of the first 50 positive even integers.

Mathematics
1 answer:
adell [148]3 years ago
7 0
2250
50*(2+100)/2
50*102/2
50*51
2250
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The 4th term in a geometric sequence is -15, the 5th term is 45 and the 6th term is -135. Find the sum of the first 7 terms.
Andreas93 [3]

Answer:

d) 303 8/9

Step-by-step explanation:

4th term = ar^3  and 5th = ar^4   where a = first term and r = common ratio.

So ar^4 / ar^3

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Working back,:

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= 5/9

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soldi70 [24.7K]

Answer:

n = \frac{1}{3} , n = \frac{1}{2}

Step-by-step explanation:

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Consider the product of the factors of the coefficient of the n² term and the constant term which sum to give the coefficient of the n- term

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(2n - 1)(3n - 1) = 0 ← in factored form

Equate each factor to zero and solve for n

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2n - 1 = 0 ⇒ 2n = 1 ⇒ n = \frac{1}{2}

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2 years ago
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