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riadik2000 [5.3K]

3 years ago

15

A geometric sequence has a4 = 4 and a5 = 7. What is a1 ? Your answer

1 answer:

svetlana [45]3 years ago

5 0

Answer:

4⁴/7³ or 256/343

Step-by-step explanation:

<u>Given GP with </u>

a₄ = 4
a₅ = 7
a₁ = ?

<u>Let the common difference is r, then</u>

a₅ = a₄r
a₁r³ = 4
a₁r⁴ = 7

<u>Solve for r and then a₁:</u>

4r = 7 ⇒ r = 7/4
a₁(7/4)³ = 4
a₁ = 4*(4/7)³ = 4⁴/7³ = 256/343

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arsen [322]

Answer:

Solution given:

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and 250 m³.

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PolarNik [594]

Answer:

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Step-by-step explanation:

a+b=0

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a = - (± 6i)

so b = 6i then a = -6i

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Answer:

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