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#1 (permalink) |
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I JUST got here.
Join Date: Apr 2008
Posts: 5
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need help on these questions
1
In the xy-plane, line n passes through the origin and has slope 4. If points (1, c) and (d, 2) are on line n, what is the value of c/d ? A.0.25 B.0.5 C.2 D.4 E.8 2 The charge for a single room at Hotel P is 25 percent less than the charge for a single room at Hotel R and 10 percent less than the charge for a single room at Hotel G. The charge for a single room at Hotel R is what percent greater than the charge for a single room at Hotel G ? A. 15% B. 20% C. 40% D. 50% E.150% 3 If d = 1 / 2^3 * 5^7 is expressed as a terminating decimal, how many nonzero digits will d have? A.One B.Two C.Three D.Seven E.Ten 4 If M is the least common multiple of 90, 196, and 300, which of the following is NOT a factor of M ? A. 600 B. 700 C. 900 D.2,100 E.4,900 thanks a ton |
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#2 (permalink) |
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GiMme AThanor
Join Date: Jul 2008
Posts: 14
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1)
y = mx + s (where m is the slope and s is constant) y = 4x + s 0 = 4(0) + s (since this passes through origin) => s=0 y=4x is the equation substituting values of 2 coordinates in this eq. c=4(1) ----eq1 2=4(d) => d = 1/2 ----eq2 dividing eq1 and eq2 c/d=8 2) Let rate in R = x => rate in P = .75x ----1 Let rate in G = y => rate in P = .9y ------2 equating 1 n 2 .75x=.9y or x = 1.2 y so rate in Hotel R is 20% more than G |
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#3 (permalink) |
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GiMme AThanor
Join Date: Jul 2008
Posts: 14
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3)
I am not sure if this d = 1 / 2^3 * 5^7 means d = 1 /( 2^3 * 5^7) or this means d = 5^7/ 2^3? If its the first one. 1/(2^3 * 5^3 * 5^4) 1/(10^3*5^4) multiplying num and den by 10^4 10^4/(10^7*5^4) (10/5)^4/(10^7) or 2^4/10^7 so it has 7 decimal digits 4) Finding LCM of 90, 196 and 300 => 9 * 25 * 49 * 4 => 9 * 49 * 100 so 600 is not a factor |
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#4 (permalink) | |
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Within my grasp!
![]() ![]() Join Date: Jul 2008
Posts: 375
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Quote:
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#6 (permalink) | |
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Eager!
Join Date: Jun 2008
Posts: 68
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#10 (permalink) |
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I JUST got here.
Join Date: Aug 2008
Posts: 6
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LCM : 9 x 100 x 49
can be rephrased as 9 x 100 x 7 x 7 -> 700 is a valid factor can be rephrased as 9 x 100 x 49 -> 900 is a valid factor can be rephrased as 3 x 3 x 100 x 7 x 7 -> 2100 is a valid factor can be rephrased as 9 x 100 x 49 -> 4900 is a valid factor can't be rephrased similarly for 600 , hence 600 is the answer |
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