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If 7^9 + 7 9 + 7^9
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18 Jul 2018, 16:51
18 Jul 2018, 16:51
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Question Stats:
80% (00:28) correct
19% (00:50) wrong based on 106 sessions
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If \(7^9 + 7^9 + 7^9 + 7^9 + 7^9 + 7^9 + 7^9 = 7^x\) , what is the value of x?
(A) 9
(B) 10
(C) 12
(D) 63
(E) \(9^7\)
Kudos for R.A.E.
(A) 9
(B) 10
(C) 12
(D) 63
(E) \(9^7\)
Kudos for R.A.E.
Re: If 7^9 + 7 9 + 7^9
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18 Jul 2018, 19:57
18 Jul 2018, 19:57
1
Carcass wrote:
If \(7^9 + 7^9 + 7^9 + 7^9 + 7^9 + 7^9 + 7^9 = 7^x\) , what is the value of x?
(A) 9
(B) 10
(C) 12
(D) 63
(E) \(9^7\)
Kudos for R.A.E.
(A) 9
(B) 10
(C) 12
(D) 63
(E) \(9^7\)
Kudos for R.A.E.
Given,
\(7^9 + 7^9 + 7^9 + 7^9 + 7^9 + 7^9 + 7^9 = 7^x\)
or \(7^9 ( 1 + 1 + 1 + 1 + 1 + 1 + 1 ) = 7^x\)
or \(7^9 (7^1) = 7^x\)
or \(7^{10} = 7^x\)
or \(x = 10\)
Re: If 7^9 + 7 9 + 7^9
[#permalink]
19 Jul 2018, 12:07
19 Jul 2018, 12:07
1
Carcass wrote:
If \(7^9 + 7^9 + 7^9 + 7^9 + 7^9 + 7^9 + 7^9 = 7^x\) , what is the value of x?
(A) 9
(B) 10
(C) 12
(D) 63
(E) \(9^7\)
Kudos for R.A.E.
(A) 9
(B) 10
(C) 12
(D) 63
(E) \(9^7\)
Kudos for R.A.E.
Given
\(7^9 + 7^9 + 7^9 + 7^9 + 7^9 + 7^9 + 7^9 = 7^x\)
= \(7^9\) ( 1 + 1 + 1 + 1 + 1 + 1 + 1 )
= \(7^9\) * \(7^1\)
= \(7^{10}\)
So x must be 10.
The best answer is B.
