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For all numbers, x, the function f is defined by f(x) = ax^3/3, where

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For all numbers, x, the function f is defined by f(x) = ax^3/3, where  [#permalink]

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New post 21 Jan 2019, 03:35
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A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

96% (00:43) correct 4% (02:08) wrong based on 27 sessions

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For all numbers, x, the function f is defined by \(f(x) = \frac{ax^3}{3}\), where a is a constant. If f(3) = 45, then a =

A 3
B 5
C 15
D 30
E 35
Spoiler: OA

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Re: For all numbers, x, the function f is defined by f(x) = ax^3/3, where  [#permalink]

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New post 21 Jan 2019, 09:50
Bunuel wrote:
For all numbers, x, the function f is defined by \(f(x) = \frac{ax^3}{3}\), where a is a constant. If f(3) = 45, then a =

A 3
B 5
C 15
D 30
E 35


given
\(f(x) = \frac{ax^3}{3}\)
f(3) = a * 3*3*3/ 3
45= a * 9
a = 5
IMO B
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Re: For all numbers, x, the function f is defined by f(x) = ax^3/3, where   [#permalink] 21 Jan 2019, 09:50
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