Core mathematics

The 4th term of an A.P.is 37 and the 6th term is 12 more than the 4th term.find the 1st and the 7th term of the sequence.

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  1. 4th term is 37 ---> a + 3d = 37

    6th term is 12 more than 4th term ---> a+5d = a+3d + 12
    2d = 12
    d = 6
    then in a+3d = 37
    a + 18 = 37
    a = 19

    first term is 19
    7th term = a+6d = 127

    check:
    19 25 31 37 43 49
    is 4th term 37 ? yes
    is 6th term 12 more than 4th? yes

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  2. 1 = 6.16 and 7= 43.12

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  3. i think

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  4. Reiny can u answer my other question please it is the latest one about the charity swim

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  5. 55

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  6. a+6d=19+36=55

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  7. Arithmetic and geometric progression. the following expression respresents a general arithmetic progression (AP):
    A + (a + d ) + ( a + 2d) + :: + (1 - d) + 1

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  8. WRONG

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