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13 March, 14:05

Use the information given to identify the a_9 term of the geometric sequence: a_4=1/2, r=1/2

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  1. 13 March, 16:57
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    A given term in a PG = a₁rⁿ⁻¹

    Let' calculate the 1st term a₁, knowing a term & the common factor/ratio

    a₄ = 1/2 so 1/2 = a₁ (1/2) ³

    1/2 = a₁/8 and a₁ = 4

    Now calculate a₉ = a₁. r⁸

    a₉ = 4. (1/2) ⁸ and a₉ = 1/64
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