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

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Math Expert
Joined: 02 Sep 2009
Posts: 58434
For all numbers, x, the function f is defined by f(x) = ax^3/3, where  [#permalink]

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21 Jan 2019, 03:35
00:00

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

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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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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
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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