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Sagot :
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Explicação passo a passo:
Mariana deve correr 12.800 metros no último dia de treinamento.
Progressão geométrica
Uma progressão geométrica é caracterizada por uma sequência de valores crescentes, decrescentes ou alternados, onde a razão entre um valor e seu antecessor é sempre constante. O termo geral da P.G. é dado por aₙ = a₁·qⁿ⁻¹, sendo q a razão calculada por q = aₙ₊₁/aₙ.
Para resolver a questão, precisamos calcular a distância percorrida no último dia de treinamento. Se a distância deve ser sempre o dobro do dia anterior, a razão da PG será igual a 2. Como o primeiro termo é 200, temos:
aₙ = 200·2ⁿ⁻¹
Para o sétimo dia, teremos n = 7:
a₇ = 200·2⁷⁻¹
a₇ = 200·64
a₇ = 12.800 metros
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