If f(x) = 1/3x − 2 and g(x) = −2x − 1, find (f • g) (9) . A) 19. B) −18. C) 0. D) −19

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02-09-2016
Mathematics

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If f(x) = 1/3x − 2 and g(x) = −2x − 1, find (f • g) (9) . A) 19. B) −18. C) 0. D) −19

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HomertheGenius HomertheGenius · Answer 1 · 2016-09-11T15:46:00+02:00

HomertheGenius HomertheGenius

11-09-2016

f · g = ( 1/3 x - 2 ) · ( - 2 x - 1 )
( f · g )( 9 ) = ( 1/3 · 9 - 2 ) · ( - 2 · 9 - 1 )=
= ( 3 - 2 ) · ( -19 ) = 1 · ( - 19 ) = - 19
Answer: D ) - 19

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