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arlik [135]
3 years ago
5

In an arithmetic series, the 6th term is 39 In the same arithmetic series, the 19th term is 7.8 Work out the sum of the first 25

terms of the arithmetic series.
Mathematics
1 answer:
Lisa [10]3 years ago
8 0

Answer:

1,500

Step-by-step explanation:

a + 5d = 39 (1)

a + 18d = 78 (2)

Subtract (1) from (2) to eliminate a

18d - 5d = 78 - 39

13d = 39

d = 39/13

d = 3

Substitute d = 3 into (1)

a + 5d = 39 (1)

a + 5(3) = 39

a + 15 = 39

a = 39 - 15

a = 24

Sum of the first 25 terms

Sn = n/2[2a + (n – 1)d]

S25 = 25/2{2*24 + (25-1)3}

= 12.5{48 + (24)3}

= 12.5{48 + 72)

= 600 + 900

= 1,500

S25 = 1,500

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The inequality simplifies to
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timama [110]

Answer:

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Step-by-step explanation:

given,

cost of saddle = $534.00

riding chaps cost  = $87.02

boots cost = $143.99

hat cost = $55.87

pairs of glove cost = $15.94

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Total purchase cost

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C because its a lot cheaper and it will e more beneficial
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Answer:

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