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

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Joined: 02 Sep 2009
Posts: 52905
For all numbers, x, the function f is defined by f(x) = ax^3/3, where  [#permalink]

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21 Jan 2019, 02:35
00:00

Difficulty:

15% (low)

Question Stats:

92% (00:40) correct 8% (02:08) wrong based on 16 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, 08:50
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, 08:50
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# For all numbers, x, the function f is defined by f(x) = ax^3/3, where

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