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via algebra.com's RSS system.Unanswered: 50 problems
Graphs/571181 (2012-02-11 06:48:39): How would the following equation be represented graphically:
-3x+y=4
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Quadratic-relations-and-conic-sections/571180 (2012-02-11 06:32:10): Find the equation of the parabola, given the condition: Axis horizontal, vertex on y-axis, and passing through (2,4) and (8,-2).
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Trigonometry-basics/571179 (2012-02-11 06:29:54): what is the exact numerical value of csc (20 degrees) - cot (40 degrees.
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Percentage-and-ratio-word-problems/571178 (2012-02-11 06:22:07): After finding the average of 35 scores, a student carelessly included the average with the 35 scores and found the average of these 36 numbers. The ratio of the second average to the true average was
(A) 1 : 1 (B) 35 : 36 (C) 36 : 35 (D) 2 : 1 (E) None of these
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Unit_Conversion_Word_Problems/571177 (2012-02-11 06:10:55): convert 2 and 3/5 g/cm to kg/m
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Polynomials-and-rational-expressions/571176 (2012-02-11 05:58:05): One printing machine works twice as fast as the other. When both machines are used , they can print a newspaper in 3 hrs. How long would the cash machine requires to print alone?
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Probability-and-statistics/571175 (2012-02-11 05:54:54): 1.find the probability that a student chosen at random is {a}14,{b}14 or less.
2.A card is picked at random from a pack of playing cards.find the probability of picking{a}the 5 of hearts
{b}the king of spades
{c}a 9
{d}a black Queen
{e}a diamond
{f}either a jack,a 2 orAce
{g}a red card
{h}a red club
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absolute-value/571174 (2012-02-11 05:40:43): [6 3/7 minus 3x/4 -2 over 0,35 multiply 2,8 minus 1 3/4]:1/20=35
(good day. I'm not sure if I typed it in correctly but I have an image of the problem I can send. Thank you for the time.)
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Length-and-distance/571173 (2012-02-11 05:04:48): The vertices of a triangle are P(-4,-3) Q(4,-1) and R(-2,3) What are the lengths of its median
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Permutations/571172 (2012-02-11 05:01:40): six books are to be selected from 9 diffrent books such that,
(1) one specified book is always selcted
(2) the spcified book is not selected
in how many ways nine books can be selected in each case?
thanks :)
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Age_Word_Problems/571171 (2012-02-11 04:25:13): susan is six years older than ana. she is twice as old as ana. how old is she now?
mike is 40 years. his son is 10 years he will be twice as old as his son what is the present age of each?
find the three consecutive integers whose sum is seventy-five.
the sum of 4 consecutive given in each is negative one hundred forty-eiht find the integer.
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Mixture_Word_Problems/571170 (2012-02-11 03:58:11): A chemist needs
500 milliliters of a 20% acid and 80% water
mix for a chemistry experiment. The chemist
combines x milliliters of a 10% acid and
90% water mix and y milliliters of a 30% acid
and 70% water mix to make the 20% acid and
80% water mix.
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Percentage-and-ratio-word-problems/571169 (2012-02-11 03:45:39): A man sells 10 eggs for Rs.5 and gains 20%. How many eggs did he buy for Rs.5 ???
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Rectangles/571168 (2012-02-11 02:54:50): The length of a rectangle is 5 meter more than twice the width. If the perimeter is 88 meter. What are the dimensions of the rectangle?
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Linear_Equations_And_Systems_Word_Problems/571167 (2012-02-11 02:42:11): The perimeter of a triangle garden is 60 feet. Find the length of the 3 sides if 1 side is 4 feet greater than twice the length of the smallest side, and the 3rd side is 4 feet less than 3 times the length of the smallest side.
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Parallelograms/571166 (2012-02-11 02:40:04): In a parallelogram ACTV the bisectors of Angle A and Angle C meet at O. find Angle AOC?
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Linear_Equations_And_Systems_Word_Problems/571165 (2012-02-11 02:32:57): 1,500,000 plants, animals, insects. Insects are subdivided into beetles and insects are not beetles. There are about 100,000 more plant than animal species. 290,000 more non-beetle insects than animals. Number of beetles is 140,000 less than twice the number of animal, plant, non-beetle, insect and beetle species.
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Percentage-and-ratio-word-problems/571164 (2012-02-11 02:04:55): The price of petrol is Rs.51.90 per litre. If the price increases by one tenth of a rupee,
what is the new price?
Sir please give the solution with correct steps to solve the problem
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Linear_Equations_And_Systems_Word_Problems/571163 (2012-02-11 02:04:02): The cost of renting a truck is $35 per day, plus 20 cents per mile. How far can Tanya drive in 1 day, if she has only $80?
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Percentage-and-ratio-word-problems/571162 (2012-02-11 02:01:39): . If the price of Diesel changes from Rs.30.00 to Rs.60.00, what is the percentage
change?
Sir please give the solution with correct steps to solve the problem
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Linear-equations/571161 (2012-02-11 02:00:29): Neena's father is thrice as old as neena . after 12 yearshe will be just twice as old as neena . find thier present ages.
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Money_Word_Problems/571160 (2012-02-11 01:44:29): Tyler is taking piano lessons. Because he doesn't practice as often as his parents would like him to, he has to pay of part of the lessons himself. His parents pay him $.50 to do the laundry and $1.25 to mow the lawn. In one month, he does the laundry 6 more thimes than he mows the lawn. If his parents pay him $13.50 that month, how many times did he mow the lawn?
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Systems-of-equations/571159 (2012-02-11 01:21:55): The sum of two numbers is 40. If two is added to the larger number, the result is equal to twice the smaller number. What are the two numbers?
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Exponents/571156 (2012-02-11 00:56:55): 50 square roots q=2q+1050
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Money_Word_Problems/571155 (2012-02-11 00:51:54): A stockbroker has money in three accounts. The interest rates on the three accounts are 8%, 9%, and 10%. If she has twice as much money invested at 9% as she has invested at 8%, three times as much at 10% as she has at 8%, and the total interest for the year is $280, how much is invested at each rate? (Hint let x= the amount invested at 8%)
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Probability-and-statistics/571154 (2012-02-11 00:51:02): Below are monthly rents paid by 30 students who live off campus. (a) Find the mean, median,
mode, standard deviation, and quartiles. (b) Describe the “typical” rent paid by a student. (c) Do
the measures of central tendency agree? Explain. (d) Sort and standardize the data. (e) Are there
outliers or unusual data values? (f) Using the Empirical Rule, do you think the data could be from
a normal population?
Rents
730 730 730 930 700 570
690 1,030 740 620 720 670
560 740 650 660 850 930
600 620 760 690 710 500
730 800 820 840 720 700
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Probability-and-statistics/571153 (2012-02-11 00:41:16): This table shows the distribution of winning times in the Kentucky Derby (a horse race) over
74 years. Times are recorded to the nearest 1/5 second (e.g., 121.4). (a) From the grouped data,
calculate the mean, standard deviation, and coefficient of variation for each year. Show your calculations
clearly in a worksheet. (b) Write a concise summary of central tendency and dispersion
for Derby winning times. (c) What additional information would you have gained by having the
raw data? (d) Do you think it likely that the distribution of times within each interval might not be
uniform? Why would that matter?
Kentucky Derby Winning Times (seconds) Derby
From To f
119 120 1
120 121 5
121 122 16
122 123 22
123 124 12
124 125 8
125 126 5
126 127 3
127 128 2
Total 74
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Probability-and-statistics/571152 (2012-02-11 00:38:46): M&Ms are blended in a ratio of 13 percent brown, 14 percent yellow, 13 percent red, 24 percent
blue, 20 percent orange, and 16 percent green. Suppose you choose a sample of two M&Ms at
random from a large bag. (a) Show the sample space. (b) What is the probability that both are
brown? (c) Both blue? (d) Both green? (e) Find the probability of one brown and one green M&M.
(f ) Actually take 100 samples of two M&Ms (with replacement) and record the frequency of each
outcome listed in (b) and (c) above. How close did your empirical results come to your predictions?
(g) Which definition of probability applies in this situation?
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Age_Word_Problems/571151 (2012-02-11 00:37:52): If Mary is 5 year old younger than Ana how old are they when Ana will be twice as old Mary 10 years from now.
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Polynomials-and-rational-expressions/571150 (2012-02-11 00:36:06): This my last homework question that I need help with please.,I will have to describe the circle diagram.
I have to find P n Q. and Write in correct set notation.
There are two interlocking circles that are labeled Circle P and Q.
In Circle P are the letters P,e. In Circle Q are letters c, k. In the intersection are letters s,n,a.
Thanks for all your help
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Age_Word_Problems/571148 (2012-02-11 00:15:51): If Mary is 5 year old younger than Ana how old are they whwn ana will be twice as old Mary 10 years from now.
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t e s t/571147 (2012-02-11 00:04:58): Please help me simplify 2x+6/(x-1)^-1(x^2+2x-3)
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Probability-and-statistics/571146 (2012-02-11 00:02:54): Confidence Intervals and Sample size.
Travel Data Center's survey of 1500 students found the 42% of respondents stated that they favor historical sites as vacations. Find the 95% confidence interval of the true preparation of all students who favor visiting historical sites as vacations.
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Miscellaneous_Word_Problems/571144 (2012-02-10 23:57:29): 2. Cora Zayas is a buyer for a large manufacturing company . She can purchase 200 pounds of chemicals for $85. She can also purchase mixing vats for $500 each. Sales tax on all products is 6% of the total cost of the order. Shipping costs for her order will be a flat $40.
a. At this same rate, how much would 4,000 pounds of chemicals cost if Cora Zayas purchase 200 pounds of chemicals for $85. She can also purchase mixing vats for $500 each and sales tax on all products is 6% of the total cost of the order. Shipping costs for her order will be a flat $40?
Answer:
b. This month she doesn’t know yet how many mixing vats she will need to order. Let y = number of mixing vats required. Write an equation using y that she can use to determine the total amount of her order. Assume no chemicals are ordered, only vats.
Answer:
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Probability-and-statistics/571143 (2012-02-10 23:57:27): I need help solving a problem.
A U.S Travel Data Center survey reported that Americans stayed an average of 7.5 nights when they went on vacation. The sample size was 1500. Find a pointe estimate of the population mean. Find the 95% confidence interval of the true mean. Assume the population standard deviation was 0.8.
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Linear_Equations_And_Systems_Word_Problems/571142 (2012-02-10 23:06:10): Sarah meeham makes coffee for Tasti-Delight. She needs to prepare 110 pounds of blended coffee beans selling for $3.75 per pound. She plans on doing this by blending together a high-quality bean costing $4.75 a pound and a cheaper bean at $2.00 per pound. To the nearest pound, find out how much high-quality coffee bean and how much cheaper coffee bean she should blend.
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Linear_Equations_And_Systems_Word_Problems/571141 (2012-02-10 23:02:15): The basement of your house is only partially finished. Currently, there is a room that you use for storage. You want to convert this space into a home office, but you want more space than is available in this room now. You decide to knock down to walls and enlarge the room. The existing room has a perimeter of 54 feet. If you extend the width of the room by 4 feet and make the new length 4 feet less then double the original length, the new perimeter would be 82 feet. What are the dimensions of the existing room? and what are the dimensions of the new room?
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Sequences-and-series/571140 (2012-02-10 22:41:26): Write a function rule for the area, A, of a triangle whose base, b, is 2 cm less than seven times the height, h. What is the area of the triangle when the height is 14 cm?
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Probability-and-statistics/571139 (2012-02-10 22:40:42): A nationwide survey of medical complaints indicated that 66 out of 150 people in the Southwestern US and 58 out of 160 people in the National Capital Region caught the common cold in 2008. Is this a chance difference? Is the data consistent with the hypothesis that geography plays a role? Test at a = .05
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Volume/571137 (2012-02-10 22:39:36): a closed matallic box is 1.25m high and its has a base whose radius is 35cm. If the sheet of metal costs Rs 80 per sq.meter. then find the cost of the material used in the box.
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Money_Word_Problems/571136 (2012-02-10 22:39:13): A woman has $50,000 to invest. She has decided to invest it all by
purchasing some shares of stock in each of three companies: a fast-food chain that sells for $50 per
share and has an expected growth of 11.5% per year, a software company that sells for $20 per share
and has an expected growth of of 15% per year, and a pharmaceutical company that sells for $80 per
share and has an expected growth of 10% per year. She plans to buy twice as many shares in the fastfood
chain as in the pharmaceutical company. If her goal is 12% growth per year, how many shares of
each stock should she buy?
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Pythagorean-theorem/571133 (2012-02-10 22:30:36): Given angle ABC is isosceles, angle B and angle C are congruent and angle A is 50 degrees, find the exterior angle ACD. Draw diagram.
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Functions/571128 (2012-02-10 22:20:57): I have to determine whether the graphs of each pair of lines are parallel...Please help.
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Linear-equations/571126 (2012-02-10 22:14:39): x+y=10
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Geometry_proofs/571124 (2012-02-10 22:11:16): I need some major help on these proof I'm wrecking my mind :( i have to prove a triangle is isosceles in almost all of them and then some intersect and one has parallel lines I just dont know where to start and one of them says quadrillateral abcd with line segment ad equal to bc and angle dab is equal to cba then i have to prove that it's isosceles
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Trigonometry-basics/571123 (2012-02-10 22:09:55): A surveyor, using a transit, sights the edge B of a bluff. Because of the curvature of the earth, the true elevation h of the bluff is larger than that measured by the surveyor. A cross-sectional schematic view of the earth is shown in the second figure.
(a) If s is the length of arc PQ and R is the distance from P to the center C of the earth, express h in terms of R and s.
(b) If R=4000 mi and s=50 mi, estimate the elevation of the bluff in feet.
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Average/571122 (2012-02-10 22:07:45): What is the advantage of using a two-factor design rather than conducting two separate studies, each investigating one of the factors
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Trigonometry-basics/571121 (2012-02-10 22:06:55): The manufacturer of a computerized projection system recommends that a projection unit be mounted on the ceiling. The distance from the end of the mounting bracket to the center of the screen is 85.5 inches, and the angle of depression is 30°.
(a) If the thickness of the screen is disregarded how far from the wall should the bracket be mounted?
(b) If the bracket is 18 inches long and the screen is 6 feet high, determine the distance from the ceiling to the top edge of the screen.
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test/571118 (2012-02-10 21:55:34): 1.) Side AB of a rectangle ABCD is located on the x- axis, within the interval[-4,4]. Another horizontal side is defined by points C and D, lying on the straight lines y = 3x +12 and y = -3x +12, respectively. Find the maximal possible area of the rectangle.
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Trigonometry-basics/571117 (2012-02-10 21:51:09): 2 planes leave a terminal with the 1st plane bearing 63degrees at 500km/hr and the 2nd plane bearing 153degrees at 400km/hr , calculate the bearing of the first with the second?
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