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20-07-2017
Mathematics

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What is the value of the fourth term in a geometric sequence for which a1 = 10 and r = 0.5 ?

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20-07-2017

[tex]\bf\\ a_1 = 10~\text{\bf and} ~r=0.5\\\\ a_2 = a_1 \times r = 10 \times 0,5 = 5\\\\ a_3 = a_2\times r = 5 \times 0,5 = 2.5\\\\ a_4 = a_3\times r = 2.5 \times 0,5 = \boxed{\bf 1.25} [/tex]

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