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09 Nov 2015, 23:16
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C
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Difficulty:
5%
(low)
Question Stats:
96% (00:28) correct
4%
(00:24)
wrong
based on 1354
sessions
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If x is an even integer, which of the following is an odd integer?
(A) 3x + 2
(B) 7x
(C) 8x +5
(D) x^2
(E) x^3
(A) 3x + 2
(B) 7x
(C) 8x +5
(D) x^2
(E) x^3
10 Nov 2015, 09:39
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Bunuel
With questions like this, we can apply RULES related to odds and evens (as skywalker18 did), or we can just PLUG IN an even value for x.
The easiest value to plug in is 0
(A) 3(0) + 2 = 2 EVEN - ELIMINATE A
(B) 7(0) = 0 EVEN - ELIMINATE B
(C) 8(0) +5 = 5 ODD. DONE!!!
Answer: C
For "kicks" let's keep going (although, on test day, we would select C and move onto the next question.
(D) 0^2 = 0 EVEN - ELIMINATE D
(E) 0^3 = 0 EVEN - ELIMINATE E
Cheers,
Brent
General Discussion
09 Nov 2015, 23:59
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(A) 3x + 2
3*Even +2
= Even +Even = Even
(B) 7x
7*Even= Even
(C) 8x +5
8*Even +5
= Even +5
= Odd
(D) x^2
= Even * Even = Even
(E) x^3
= Even *Even * Even
= Even
Answer C
3*Even +2
= Even +Even = Even
(B) 7x
7*Even= Even
(C) 8x +5
8*Even +5
= Even +5
= Odd
(D) x^2
= Even * Even = Even
(E) x^3
= Even *Even * Even
= Even
Answer C
