BRAIN TEST! MATH problems!!?

Alrighty lets test out your brain!





1. If n and k are postive integers and 8^n=2^k, what is the value of n/k?


A. 1/4


B. 1/3


C. 1/2


D. 3


E. 4


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2. In a certain store, the regular price of a refrigerator is $600. How much money is saved by buying this refrigerator at 20 percent off the regular price rather than buying it on sale at 10 percent off the sale price?


A $6


B $12


C $24


D $54


E $60


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3. If the function f is defined by f(x)=3x=4, then 2f(x)+4=


A 5x+4


B 5x+8


C 6x+4


D 6x+8


E 6x+12


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4 A total of 120,000 votes were cast for 2 opposing candidateeeeee, Garcia and Perez. If Garcia won by a ratio of 5 to 3, what was the number of votes cast for Perez?


A 15,000


B 30,000


C 45,000


D 75,000


E 80,000


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5 If a postive integer n is piced at random from the postive integers less than or equal to 10, what is the probability that 5n+3 %26lt;(or equal to) 14


A 0


B 1/10


C 1/5


D 3/10


E 2/5


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GO! :-)

BRAIN TEST! MATH problems!!?
1. B.


2. E.


3. E.


4. C.


5. D.
Reply:Thanks. It was my pleasure! Report It

Reply:1-b


2-e


3-e


4-c


5-c
Reply:1. ln(8^n) = ln(2^k)


n ln(8) = k ln(2)


n/k = ln2/ln8 = ln2/ln(2^3) = ln2/[3ln2] = 1/3





2. not sure what the question is





3. f(x)=3x=4


2f(x)+4 = 2(3x)+4 = 2(4)+4 = 12





4. Let x = number of votes for Garcia


then 120000-x = number votes for Perez


So that x/(120000-x) = 5/3


3x = 600000-5x


8x = 600000


x = 600000/8 = 75000 votes for Garcia


120000-x = 120000-75000 = 45000 votes for Perez





5. If n = 1, then 5n+3 = 8


If n=2, then 5n+3 = 13


If n=3, then 5n+3 = 18


so n can only be 1 or 2; but if you include 0 as a positive integer, then the probability is 1+1+1/10 = 3/10
Reply:1 is B because 8^1=8 and 2^3=8 8=8





2 is E because 20% of 600 is 120 and 10% of 600 is 60. 120-60=60





f(x)=3x=4 2f(x)+4=?


this would mean f(x)=4 so 4=3x and x=4/3 now when f(x) is plugged in it is 12=?


3 is C because 6(4/3)+4=12 and 12=12





5x+3x=120000


8x=120000


x=15000


4 is C because 3*15000=45000





5 is D because only 0, 1, and 2 work in this instance
Reply:b


e


e


c


d
Reply:If n and k are postive integers and 8^n=2^k, what is the value of n/k? 8^n = 2^3n =2^k so 3n =k so n/k = 1/3





You have not indicated what the sale price is, so problem cannot be answered.





If you mean f(x)= 3x+4, then 2f(x) = 6x+8





G/P = 5/3 ---%26gt; G = 5P/3


P + G = 120,000


P +5P/3 =120,000


8P/3 =120,000


P = 3*120,000/8 = 45,000





Only 1 or 2 satisfies the inequality.


Thus the odds are 2/10 or 1/5
Reply:b


e


e


c


c





smoochez
Reply:1. B


2. E


3. E


4. C


5. D