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Unanswered: 50 problems
Money_Word_Problems/241322 (2009-11-21 07:59:24): 1. Sajid has a goal of saving $20 000 in 8 years. What principal invested for 5 years at 6% per annum, compounded semi-annually, then for the next 3 years at 6.5%/a, compounded quarterly, would achieve this goal?
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Pythagorean-theorem/241321 (2009-11-21 07:39:16): the sides of a triangle are 8, 15 and 17 units. if each side is doubled, by how many square units will the area of the triangle increase?
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Triangles/241320 (2009-11-21 07:28:12): One angle of a triangle is 82°.The Other two angles are in the ratio 2 : 5. Find the number of degrees in the smallest angles of the triangle.
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Circles/241318 (2009-11-21 07:12:20): if the volume of a cylinder is 462 and the height is 12 what is the radius?
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Quadratic_Equations/241317 (2009-11-21 06:39:26): Find the root of 8x^4-2x3+x^2-x+1=0
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Rectangles/241315 (2009-11-21 06:26:44): The dimensions of a room are 21 feet by 6 feet. If carpet costs $16.25 per square
yard, how much will it cost to carpet the room?
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Geometry_Word_Problems/241314 (2009-11-21 06:25:53): If a rectangle and a trapezoid have equal areas, then they must have the same
perimeters.
A) True
B) False
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Bodies-in-space/241313 (2009-11-21 06:09:19): A rectangular solid has each of its three dimensions doubled. How many times bigger is the surface area of the new solid?
A) 2 B) 4 C) 8 D) 16 E) 32
from above how many times larger is the volume of the new solid?
A) 2 B) 4 C) 6 D) 8 E) 10
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Bodies-in-space/241312 (2009-11-21 06:08:02): A rectangular solid has each of its three dimensions doubled. How many times bigger is the surface area of the new solid?
A) 2 B) 4 C) 8 D) 16 E) 32
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Geometry_Word_Problems/241309 (2009-11-21 05:12:53): The longest escalator in the world is located in Hong Kong, China. The escalator has a length of 745 ft and rises 377 ft vertical from start to finish. What is the horizontal distance from the bottom of the escalator to the top of the escalator?
A) 368 B) 643 C) 412896 D) 377 E) 600
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Bodies-in-space/241308 (2009-11-21 05:11:32): If the waffle cone supporting the spherical pint of ice cream is 4 inches tall and has a radius of 2 inches, what will be the volume in inches cubed of the waffle cone?
A) 50.2 B) 16.8 C) 5.3 D) 25.1 E) 18.8
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Inverses/241306 (2009-11-21 04:52:22): the points (3, a^2 -7a +10) and (3a + 1 , a + 2 ) lie on the graph
of an inverse variation equation . find the coordinates of the points
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Inverses/241305 (2009-11-21 04:50:30): a fulcrum is placed under the center of a board. in order for two objects to balance on the board, the distance (in feet ) of each object from the center of the board must vary inversely with its weight (in pounds) . what is the distance of each object from the center of the board ?
(7.5 lb)a___________5ft_______________b (12.5 lb)
the distance between two objects is 5ft
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Polynomials-and-rational-expressions/241304 (2009-11-21 04:31:54): Show the steps of converting
to
using x=y+5 as a subsitute.
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sets-and-operations/241303 (2009-11-21 04:14:40): 1.Draw a Venn diagram to represent i) A(BC) and ii) A(BC) .
2.A computer company wants to hire 25 programmers to handle systems programming and
40 programmers for applications programming. Of those hired, ten will be expected to perform
jobs of both types. How many programmers must be hired?
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sets-and-operations/241301 (2009-11-21 04:11:59): If A = {1,2,3,4}, B = {2,3,4,5,6,7}and the rule f assigned to each member in A is f(x) = x + 1,
then find the domain and range of f.
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Volume/241300 (2009-11-21 03:56:28): a pipe is 7/4cm thick and has an inner radius of 8cm find the vilume of the pipe which is 0.04cm long
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Polynomials-and-rational-expressions/241299 (2009-11-21 03:48:47): Can someone show me how to complete this problem..I have tried to look it up but can not figure it out.
Add
(2s^4-3s^3+4s^2+14s-9)+(s^5+9s^3+5s^2-4s+5)+(-5a^4+s^2-6s-7)
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Probability-and-statistics/241296 (2009-11-21 03:15:20): 1)A sales promoter offers a special price for a scanner with a printer. The probabilities that each functions satisfactorily over three years are 0.68 and 0.72 respectively. What is the probability that at the end of the three years:
i) Both scanner and printer will function satisfactorily?
ii) Only the printer will be functioning?
iii) At least one of the two machines will be functioning? State any assumptions made.
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2)240 students were asked to taste three types of cola in a random order and were not told their identity. The contingency table below shows the counts of preferred colas classified by the subject specialism of students.
Cola A Cola B Cola C
Mathematics 13 23 44
Economics 36 24 10
Statistics 24 8 8
Management 11 28 11
Use These data to investigate the association, if any, between a student's subject specialism and preferred cola-type. Interpret any association which exists, testing at more than one significance level.
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3)The times required by three workers to perform an assembly-line task were recorded on five randomly selected occasions. Here are the times, to the nearest minute.
Hank Joseph Susan
8 8 10
10 9 9
9 9 10
11 8 11
10 10 9
Assuming the normality of populations under consideration, at the 5% significance level,
do the data provide sufficient evidence to conclude that a difference exists between the times required by three workers to perform an assembly-line task?
Your kind assistance is highly appreciated
Bahman Mennati
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Linear_Equations_And_Systems_Word_Problems/241295 (2009-11-21 02:50:57): The equation y=-1777x+27,153 can be used to predict the number y of gun deaths in the US x years after 2000, that is, x=0 corresponds to 2000, x=3, x=4 corresponds to 2004, and so on. Predict the number of gun deaths in 2004 and 2007. In what year will the number gun deaths be 12,937?
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Linear_Equations_And_Systems_Word_Problems/241294 (2009-11-21 02:43:53): In 1991, the life expectancy of males in a certain country was 66.9 years. In 1998, it was 70.2 years. Let E represent the life expectancy in year t and let t represent the number of years since 1991.
E(t)=__t + __
(Round to the nearest tenth)
Use the function to predict the life expectance of males in 2007.
E(16)= __
(Round to the nearest tenth)
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Travel_Word_Problems/241293 (2009-11-21 02:38:51): what is
Trains A and B are traveling in the same direction on parallel tracks. train a is traveling at 100 miles per hour and train b is traveling at 125 miles per hour. Train A passes a station at 2:10 A.M If train B passes the same station at 2:22 am, at what time will train b catch up to train A?
When will train B catch up with train A?
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Permutations/241292 (2009-11-21 02:16:55): 1.a guard of 12 police men is formed from a group of n police men present in the police line in all possible ways.how many times two particular police men are together?
2.describe the origin of pigeon hole principle and give several application to every day life?
3.give a number of application of the floor and ceiling to every day life?
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Problems-with-consecutive-odd-even-integers/241291 (2009-11-21 02:00:13): Find 3 consecutive integers such that the sum of the first and second is equal to three times the third integer.
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Square-cubic-other-roots/241290 (2009-11-21 01:30:41): curt(3)sqrt(40x^7) = curt(3)sqrt(40) * curt(3)sqrt(x^7)
= (I reduced the 40 to 5 because it is 5 *8 = 40)
= 5curt(3)sqrt(x^7)
Is this correct the way I am not only writing it out but solving it correctly?
Thanks.
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Square-cubic-other-roots/241288 (2009-11-21 01:19:54): sqrt(4 - x) = (4 - x)
= (4 + x) answer
Is this correct?
Thanks
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Average/241286 (2009-11-21 01:12:23): Ryan scored 16, 22 and 24 points in three basketball games. What is the least number of points he must score in the next game to average at least 20 points per game for the four games?
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Graphs/241285 (2009-11-21 00:44:11): what does the graph of interval [-4,10] looks like?
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Radicals/241284 (2009-11-21 00:29:34): 1. 2x^2-x=-6
2. Factor c^2+14c+49=
3. (Use radical exponents to simplify) 4 radical x^12
4. Factor. 144c^2 + 648cf +729f^2=
5. Factor. 6x^7-18x^6+42x^5
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Linear-equations/241283 (2009-11-20 23:59:08): How do you find the slope of a line going through the given pair of points.
(1/8,1/9) and (3/8,2/9)
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Linear-equations/241282 (2009-11-20 23:56:20): How do you write the slope-intercept form for the equation for the line passing through the given pair of points. (-5,1) and (4,6)
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Linear-equations/241281 (2009-11-20 23:53:45): How do you find an equation in slope-intercept form of the line satisfying the specified conditions. Through (-6,-9), perpendicular to -7x-5y=-3
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Linear-equations/241279 (2009-11-20 23:49:16): How do you write the slope-intercept form of the equation for the line passing yhrough the given pair of points. I used this formula m=y2-y1/x2-x1 with y2=7/5,y1=4/5,x2=1/5,x1=-1/5
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Permutations/241277 (2009-11-20 23:45:11): To determine what effect the salespeople had on purchases, a department store polled 700 shoppers as to whether or not they had made a purchase and whether or not they were pleased with the service. Of those who had made a purchase, 125 were happy with the service and 111 were not. Of those who had made no purchase, 148 were happy with the service and 316 were not.
Find the probability that a shopper who was happy with the service had made a purchase (round the answer to the nearest hundredth). [Here I put 0.000001 and it was marked as incorrect.]
What can you conclude?
About what of those who were happy with the service made a purchase. [Here I put four and it was marked as incorrect.] Please tell me what I did incorrectly.
Thank you.
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Finance/241276 (2009-11-20 23:36:29): The present value of an account earning 8 percent interest compounded monthly is $2400. An investor needs the account to be worth $4800 two years from now. How much must he contribute monthly?
i have worked on it and every time i get a wrong answer this is how i set up my problem: FV=PV(1+i)^M
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Linear-equations/241271 (2009-11-20 23:22:04): 5x-2y=-8
3x-8y=-32 how do you do this
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Linear-equations/241269 (2009-11-20 23:19:56): 3x+2y=7
x+5y=24
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Linear-equations/241268 (2009-11-20 23:18:02): how do you do this
3x-2y=1
7x-10y=14
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Linear-equations/241266 (2009-11-20 23:12:50): how do you do this
6x+7y=46
2x-3y=-6
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Linear_Algebra/241265 (2009-11-20 23:07:51): wats 4x-y=16 also things too 2x=3y=8
y=2x+7
3x=y-1
y=3/4x-7
3y=18
3y=2x-9
5x+4y=10
4x-1/3y=-2
y-6x=5
4y-x=3
4x+7y=18
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Radicals/241263 (2009-11-20 22:17:46): 2+5/3k-3=-2/(3k-3)sqaured
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Sequences-and-series/241253 (2009-11-20 21:02:42): if a+b+c+d=0 then find the value of a^3+b^3+c^3+d^3? please solve this question.
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Polynomials-and-rational-expressions/241250 (2009-11-20 20:35:01): 2 1 2p
___ - ___ = ____
p+1 p-1 p2*-1
* p squared
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Trigonometry-basics/241244 (2009-11-20 20:15:39): PLEASE HELP ME
theta is an angle is standard position with T(-20,-21)
on its terminal ray.Find cot theta.
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Sequences-and-series/241240 (2009-11-20 20:00:58): What kind of sequence do the differences between the successive terms in the quadratic sequence below form?
1,3,7,13,21...
Use the formula for an arithmetic series to find the 75th term in the original quadratic sequence.
I know that the differences form an arithmetic sequence 2,4,6,8... But i don't get how we can use the arithmetic sequence to find the term in the quadratic sequence? Is there any relationship? Please help me solve this problem and make your explanation easy to understand! Thanks very much for your help.
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Miscellaneous_Word_Problems/241237 (2009-11-20 19:55:26): In printing an article of 48,000 words, a printer decides to use two sizes of type. Using the larger type, a printed page contains 1800 words. Using smaller type, a page contains 2400 words. The article is allotted 21 full pages in a magazine. How many pages must be in smaller type?
The answer is 17, but I have to show how they got that answer. Can you help me, please? How did they come up with 17. I have tried and I came up with 15.
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Polynomials-and-rational-expressions/241235 (2009-11-20 19:49:10): John has a choice of using one of two parking garages when he viits downtown:
Option 1: $8 a hour for the first two hour, then $2 ad hour for each more than 2: or
Opton 2: $10 for the first hour ad $.50 for each hour more than one
Let x= toal hous parked
A) Write a mathematical model representing the total parking cost, C, in terms of x for the following (assume John is parking for more than 2 hours):
Option 1: C=_________________
Option 2: C=_________________
John plans to spend the day downtown (more than 2 hours), how many total hours would John have to park for the cost of option 1 to be less than option 2. Set up an inequality and show your work algebraically using the information in part a. Don’t forget about the daily fee in Option 1 (it’s a four day proposition!). Do not assume an eight our workday. Any number of hours per day is possible.
Answer:
Show your work here:
4) Use the graph of y = x2 – 6x to answer the following:
a) Without solving the equation (or factoring), determine the solutions to the equation x2 – 6x = 0 using only the graph.
Answer:
Explain how you obtain your answer(s) by looking at the graph:
b) Does this function have a maximum or a minimum?
Answer:
Explain how you obtain your answer by looking at the graph:
c) What is the equation of the line (axis) of symmetry for this graph?
Answer:
d) What are the coordinates of the vertex in (x, y) form?
Answer:
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Systems-of-equations/241232 (2009-11-20 19:39:50): Solve each system algebraically.
y=(square root of x+3)
x-4y=-7
Thanks
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Complex_Numbers/241228 (2009-11-20 19:28:46): How do you solve the following inequality, expressing solution set using "point and interval notation": x^2+12>=7x?
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Permutations/241227 (2009-11-20 19:27:53): Ms. Gonzales gave her algebra class a test. Students could do any three of five parts, and any two of four questions from the parts they chose. How many different tests could a student write?
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