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Linsha

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Why we can hear sounds from a longer distance during monsoon
1. 0 answers
2. 410 views
The angles of a cyclic quadrilateral are the consecutive terms of arithmetic sequence and one of the angle is 45(degree)What are
1. 1 answer
2. 1,966 views
The common difference of an arithmetic sequence is d prove that the sum of first n terms and next n terms differ by n×n×d
1. 1 answer
2. 514 views
If the chairs in an auditorium are arranged in an arithmetic sequence 5 th row contains 31 chair and 16 th row contains 75
1. 5 answers
2. 725 views
If the chairs in an auditorium are arranged in an arithmetic sequence 5 th row contains 31 chair and 16 th row contains 75
1. 2 answers
2. 1,224 views

1.A 2.B
1x+3x+5x= 180 9x = 180 x =180÷9 = 20 5×20=100 100 is the measurement of largest angle
x+3x=180 4x =180 x =180÷4 x =45 First angle = 45 Third angle = 3×45 = 135
16-5=11, 75-31=44 d=4 First term = 4d-31 = 4×4-31 = -15 Number of chairs if there exists 20 rows =n÷2(2f+(n-1)d) =20÷2(2×(-15)+(20-1)4) =460

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