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via algebra.com's RSS system.Unanswered: 50 problems
Probability-and-statistics/751074 (2013-05-21 06:54:40): what are the advantages and disadvantages of using poisson distribution?
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Surface-area/751073 (2013-05-21 06:44:47): a lawn 10 m by 8 m is surrounded by a path 1 m wide find the area
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Equations/751072 (2013-05-21 06:28:44): If I place 1 cent on the first square of a chess board, 2 cents on the second, and then double it on each square, how much money will be placed on the 20th square
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Proofs/751071 (2013-05-21 06:18:37): i need to prove whether the following is valid or invalid:
(x)Ix&~Ox
~(Ex)Dx&OX
/Ox&~(Ex)(~x=x&Ox)
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�t�e�s�t/751070 (2013-05-21 06:02:40): The numbers a, b and c are in Arithmetic progression.
Show that (1/a - 1/2b), (1/2b), (1/c - 1/2b) are in geometric progression.
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�t�e�s�t/751069 (2013-05-21 06:00:51): Find the sum of the first 6 terms of the sequence (3/(-2)^1-n)
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�t�e�s�t/751068 (2013-05-21 05:58:48): Find the values of x for which 1, 2x-1, and 9x^3+13x^2-5x form geometrical progressions and hence find the fourth term.
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Polynomials-and-rational-expressions/751067 (2013-05-21 05:56:39): 3-x;16-5x;-10+7x
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�t�e�s�t/751066 (2013-05-21 05:55:40): find the sum of the square root of 7-2+1+1/2+1/4+...
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Proportions/751065 (2013-05-21 05:52:12): Answer the following. (1.5 pts ea)
1. The following box-whisker plot shows the distributions of total cholesterol levels in boys and girls 10-15 years of age.
Boys
Girls
120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270
A. What is the median total cholesterol level in boys? ________
B. What is Q1 for boys? ________
C. What is Q3 for boys? ________
D. Lower Limit for Outliers for boys: ________
E. Upper Limit for Outliers boys: ________
F. Are there any outliers in total cholesterol in boys? ________
G. What proportions of the boys have total cholesterol less than 205? _______ %
H. What proportions of the girls have total cholesterol less than 205? ___
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Age_Word_Problems/751064 (2013-05-21 05:35:45): The sum of Ramon's age and Manuel's age is 49. In 4 years, Ramon will be twice as old as Manuel then. Find their present ages.
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Circles/751063 (2013-05-21 05:08:08): The top of a dam has an angle of elevation of 1.3 radians from a point on a river. Measuring the angle of elevation to the top of the dam from a point 145 feet farther downriver is 0.8 radians; assume the two angle measurements are taken at the same elevation above sea level. How high is the dam? (Round your answer to the nearest whole number.)
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Linear-equations/751062 (2013-05-21 05:07:12): a) Find the equation of a line passing through the point
(-2, 4)
and making an angle of 17° with the x-axis. (Note: There are two answers; find them both. Round values to three decimal places as needed.)
b) Find the equation of a line making an angle of 8° with the y-axis and passing through the point
(1, 1).
(Note: There are two answers; find them both. Round values to three decimal places as needed.)
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Circles/751061 (2013-05-21 05:06:03): Shirley is on a Ferris wheel which spins at the rate of 3.6 revolutions per minute. The wheel has a radius of 35 feet, and the center of the wheel is 53 feet above the ground. After the wheel starts moving, Shirley takes 14 seconds to reach the top of the wheel.
How high above the ground is she when the wheel has been moving for 7 minutes? (Round your answer to two decimal places.)
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Circles/751060 (2013-05-21 05:04:53): George and Paula are running around a circular track. George starts at the westernmost point of the track, and Paula starts at the easternmost point. The illustration below shows their starting positions and running directions. They start running toward each other at constant speeds. George runs at 8 feet per second. Paula takes 50 seconds to run a lap of the track. George and Paula pass each other after 12 seconds.
After running for 3 minutes, how far east of his starting point is George? (Round your answer to three decimal places.)
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Equations/751057 (2013-05-21 04:21:51): The author of a certain book, in a global village of 300 people, 24 suffer from malnutrition. How many people of the world's 6.9 billion people (2010 population) suffer from malnutrition?
The number of the world's population that suffer from malnutrition is ___billion.
(Type an integer or decimal rounded to the nearest hundredth as needed)
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test/751056 (2013-05-21 04:17:00): x+(4x×72/380)=956
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Graphs/751055 (2013-05-21 04:00:24): Graph the given inequality y>5
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Inverses/751054 (2013-05-21 03:58:22): Sorry I do not know which category of algebra this question comes under.
8x - 6 = ?
if x = -1
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Matrices-and-determiminant/751053 (2013-05-21 02:53:54): -4x + 7y = 1
25 = 2x + 5
Evaluate Dx.
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Equations/751051 (2013-05-21 02:50:08): solve the equations
x+2y+3z=20
2x+3y+4z=32
find the value of x,y,z .
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Miscellaneous_Word_Problems/751048 (2013-05-21 02:40:26): given an economy based on two products, X and Y and the following data: It takes 2/3 of a unit of X to produce 1 unit of Y. It takes 1/2 unit of Y to make x.
a)write the input-output matrix
b) find the production required to satisfy a demand of 400 units of Y and 800 units of X
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Linear-equations/751047 (2013-05-21 02:26:50): A father opens a bank account when his daughter is born and deposits $5. Each year on her birthday he deposits twice the amount that he did in the previous year (i.e. on her first birthday he deposits $10). He continues this until she is 16 years old. Assuming that no interest is paid, how much is in the account after this time. This is a nonlinear equation but is also a nonlinear sequence can you help me find the Tn=?
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Trigonometry-basics/751046 (2013-05-21 02:01:27): cos theta (sin theta +cos second root theta over sin theta)=cot theta .....how can i solve this problem?
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test/751045 (2013-05-21 01:53:53):
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Bodies-in-space/751044 (2013-05-21 01:53:12): how to dot product two vectors with different planes?
i have vectors A,B and C. vectors A and B is on x-y plane while vector C is on x-y-z plane. i need to find the dot product of A and C (A.C) how should i do that? my book says that dot product of two vectors can be expressed in terms of their rectangular components. vector B lies in y-axis. vector A makes 60 degrees to B. vector C makes 37 degrees to x-axis. A=10.0 B=8.0 and C-5.0
please help me to solve this problem
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Exponents/751042 (2013-05-21 01:50:27): 3(x-3)+6=3x+3x- -12
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Permutations/751039 (2013-05-21 00:59:36): 6 cards- 1,2,3,4,5,6. Find the numbers of selection of 3 cards from 6 cards if the digit is less than 6 and of even number
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Age_Word_Problems/751037 (2013-05-21 00:34:43): There are some lotus flowers in a lake. If one butterfly sits on each flower, one butterfly is left behind. If two butterfly sit on each flower, one buterfly is left behind. If two butterflies sit on each flower, one flower is left behind. FInd the number of flowers and butterflies?
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Linear_Equations_And_Systems_Word_Problems/751032 (2013-05-21 00:20:10): Richard has four times as marbles as John, they would have the same number. How many marbles has each?
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Geometry_Word_Problems/751031 (2013-05-21 00:20:03): one side of a square flower bed is 20 feet long. how many plants are needed if they are to be spaced 20 inches apart around the outside of the bed
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Linear_Equations_And_Systems_Word_Problems/751030 (2013-05-21 00:16:30): The product of two consecutive even numbers is 12 more than the square of the smaller number. Find the numbers.
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Age_Word_Problems/751029 (2013-05-21 00:02:55): the product of the ages of a woman and her daughter is 490 years,if the woman is 10 times as old as the daughter what will be the sum of their ages in the next 7 years
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Linear-equations/751027 (2013-05-20 23:54:29): Solve:
(8+1) over 2 = w over 4
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Quadratic_Equations/751025 (2013-05-20 23:26:02): A store sells used video games for $10 each. At this price they sell 54 games a week. If a $1 decrease in the price results in 8 extra games being sold each week, what price should the store use to maximize their revenue?
what is the equation?
What is the vertex?
what is the answer to the question?
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Probability-and-statistics/751024 (2013-05-20 23:25:31): From a pack of 52 cards three are drawn at random, the probability that these drawn will include at
least one king is
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Permutations/751021 (2013-05-20 22:47:20): How many ways can you choose a dish of 3 on a menu of 8
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Average/751020 (2013-05-20 22:44:19): If I have a 60.1% in my class with only the final left, which is 25% of my grade, what do I need to get on the final to make a C in the class.
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Volume/751019 (2013-05-20 22:41:32): A cone has volume 320 pi and height 15. Find the total area.
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Trigonometry-basics/751014 (2013-05-20 22:25:11): Find the exact value of cot  .
Some quick help would be greatly appreciated. :)
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Trigonometry-basics/751013 (2013-05-20 22:24:00): Find the exact value of csc  .
Some quick help would be greatly appreciated. :)
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Miscellaneous_Word_Problems/751012 (2013-05-20 22:23:36): The problem reads:
Use a(t) =-32 ft/ s^2 as the acceleration due to gravity. An object is thrown vertically upward from the top of a 480 foot building with an initial velocity of 32 ft/s. With what velocity does the object hit the ground?
I don't know how to even approach this.
Thanks
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Geometry_Word_Problems/751011 (2013-05-20 22:21:06): a varies directly as b and inversely as c. One set of values is a = 14 b = 7 and c = 3 find a when b = 4 and c= 8
question 2: W varies jointly as x ad y and inversely as z. One set of values is W= 112, x = 4, y = 8, and z = 02 find W when x = 8 y= 10 and z = 4
question 3: a student made the following incorrect statement "if a pyramid has a square base and you double the length of the sides of the base and double the height the volume of the new pyramid will be four times the volumes of the original pyramid.
a. provide a counterexample to show that the statement is incorrect
b. rewrite the statement with a correct conclusion
ASAP!!!!!!!
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Geometry_Word_Problems/751008 (2013-05-20 22:13:25):
1. Suppose you have enough material for 60 feet of fencing. With this material you want to build the largest rectangular enclosure possible. What are the dimensions of the largest possible enclosure, and what is its area
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Money_Word_Problems/751001 (2013-05-20 21:54:48): A nice pen has a price tag $10.00 before tax. How much do you have to pay for it including 6.5% Montgomery County Tax?
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Quadratic_Equations/750999 (2013-05-20 21:51:09): Could you please help me with this math problem; x^2-x+4=0
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Quadratic_Equations/750998 (2013-05-20 21:50:24): Could you please help me find the solution of this problem; -y^2-6y+9=0
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Proportions/750997 (2013-05-20 21:48:15): M varies directly with the square root of D and inversely with the square root of x; M=24 when d=4 and 9=x
M=kd^2/sq.root of x
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Travel_Word_Problems/750996 (2013-05-20 21:44:42): The distance from Dayton to Indianapolis is 120 miles and it is 180 miles from Indianapolis to Chicago. If a car needs 4 gallons of gasoline to drive from Dayton to Indianapolis, how many gallons of gasoline will it need to drive to Chicago from Dayton?
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Vectors/750995 (2013-05-20 21:43:41): v=(-2,3) & u= (3,7) find the vector
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