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Soloha48 [4]
3 years ago
6

Find the sum of the sequence. 39 +40 +41 +42 + ... + 138

Mathematics
1 answer:
Elis [28]3 years ago
6 0

Answer:

Sol1 you can use "first(first+last)/2" is 138(138+1)/2 - 38(38+1)/2 = 8850

Sol2 or you can look this 39+40+41+....+100+(100+1)+(100+2)+....+(100+38) = 1+2+3+.....+99+100+100(38) = 5050+3800 =8850

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Answer:

other parallel side is 23m

Step-by-step explanation:

Let's assume other parallel sides as 'x'

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now, we can use area of trapezium formula

A=\frac{1}{2}\times h \times (x+y)

now, we can plug values

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we can set A=410

and then we can solve for x

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Answer:

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Step-by-step explanation:

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