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October 1, 2014

October 1, 2014

**Branches of Math**

**Recent Math Questions**

Post a New Question | Current Questions

**Math**

A car dealership employs 12 salesman and 28 mechanics. What is the ratio of salesman to mechanics?
*Tuesday, August 12, 2014 at 1:40pm*

**math**

To celebrate the first day of a leap year, I taught my dog to jump through a hoop. It was a Sunday. When he taught me the same trick the first day of the next year, it was a ? A. Sunday B. Monday C. Tuesday D. Wednesday
*Tuesday, August 12, 2014 at 1:37pm*

**math lit, life science, geography and cat**

Hi im a Matric learner and would really like to know what careers I could possibly look into with my subjects listed above Thank you
*Tuesday, August 12, 2014 at 1:22pm*

**math**

A bottle of water costs $1.50. Explain how you would make a graph of four ordered pairs to model the total cost of the water in terms of the number of bottles.
*Tuesday, August 12, 2014 at 1:11pm*

**math**

The largest odd factor of 6^8 times 10^ 6 is?
*Tuesday, August 12, 2014 at 1:11pm*

**math trigonometry **

a post is 20 m high. the angle of elevation of top of a house which is in front of the post is 30° from its top and 45° from foot . Find the height of house and distance between them.
*Tuesday, August 12, 2014 at 12:59pm*

**math**

I ONLY NEED HELP WITH PART C I DID THE REST ON MY OWN plz help Shane drew 3 squares with each side equal to n units. For each square, he does something different to it according to each part below. Part A: Shane increased the length and width of the square by m units each. ...
*Tuesday, August 12, 2014 at 12:57pm*

**math**

In a Sing Thing, the first 4 singers sand song 1, the next 4 sand Song 2, and so forth. Song number 73 sang Song? A. 18 B. 19 C. 20 C. 73 I got 15 but I don't know.
*Tuesday, August 12, 2014 at 11:45am*

**math**

To the nearest 1%, what percent of the 12 months have 31 days? A. 75% B. 70% C. 58% D. 50%
*Tuesday, August 12, 2014 at 11:36am*

**Math**

let f: ℤ→ ℤ and g: ℤ → ℤ be functions defined by f(x) = 3x + 1 and g(x) = |_x/2_|. (a) Is f o g one-to-one? prove (b) is f o g unto? prove (c) Is g o f one-to-one? (d) Is g o f unto? Thank you for your help.
*Tuesday, August 12, 2014 at 10:20am*

**math**

If ray BD bisects right angle ABC, the measure of angle ABD is?
*Tuesday, August 12, 2014 at 9:54am*

**Math **

A farmer is fencing a rectangular area for his farm using the straight portion of a river as one side of the rectangle. If the farmer has 2400 ft of fence, find the dimension of the rectangle that gives the maximum area for the farm
*Tuesday, August 12, 2014 at 9:37am*

**math**

a 5cm by 5cm square is cut from each corner of a rectangular piece of cardboard.the sides are folded up to make an open box with a maximum volume.if the perimeter of the base is 50cm,what are the dimensions of the box.
*Tuesday, August 12, 2014 at 9:23am*

**math**

i'm a four digit number having all the digits odd except 9 and the digits are in ascending order. who am i?
*Tuesday, August 12, 2014 at 9:05am*

**Math**

A rectangular lawn is 60meters by 80meters. A part of the lawn is torn out to install a pool, leaving a strip of lawn of uniform width around the pool. The area of the poolnis 1/6 of the old lawn area. How wide is the strip of lawn?
*Tuesday, August 12, 2014 at 5:07am*

**Math**

A gardenervhas 100 meters of fencing to enclose two adjacent rectangular gardens. The gardener wants the enclosed area to be 400 sq meters. What dimensions should the gardener use to obtain this area?
*Tuesday, August 12, 2014 at 5:03am*

**6th grade math**

Mark has $4.40 nickels and dimes.he has thirteen more nickels than dimes. How many of each does he have?
*Tuesday, August 12, 2014 at 12:59am*

**Math**

1. A gardener has 30 feet by 20 feet rectangular plot of ground. He wants to build a brick of walkway of uniform width on the border of the plot. If the gardener wants to have 400 square feet of ground left for planting, how wide should he build the walkway? 2. A rectangular ...
*Monday, August 11, 2014 at 11:08pm*

**math**

Shane takes a big cube of butter with sides of length 5 from the refrigerator. He then cuts out a little cube with sides of length 2 from one of the corners of the cube. Write a numerical expression with exponents that describes the volume of butter left.
*Monday, August 11, 2014 at 8:17pm*

**math**

Find the solution of the linear system. x + y + z = 0 −x + 2y + 5z = 6 3x − y = 12 (x, y, z)= ???
*Monday, August 11, 2014 at 7:44pm*

**math**

A researcher performs an experiment to test a hypothesis that involves the nutrients niacin and retinol. She feeds one group of laboratory rats a daily diet of precisely 36.12 units of niacin and 30,080 units of retinol. She uses two types of commercial pellet foods. Food A ...
*Monday, August 11, 2014 at 7:38pm*

**math**

25. Julia is casting a play with 3 lead roles. Five students have tried out for each part. As long as no students have tried out for more than one part, how many different ways can Julia cast the lead roles? A.60 B.80 C.125 D.25 E.50
*Monday, August 11, 2014 at 7:25pm*

**math**

2. Five hundred people, and no others, gathered in front of the White House on certain day to protest the government's immigration policies. Of these 500 people, 60% wore red arm bands showing solidarity with the immigrants. Of this 60%, 20% carried signs. How many people ...
*Monday, August 11, 2014 at 6:55pm*

**math**

Mrs. Gomes found that 40% of students at her high school take chemistry. She randomly surveys 12 students. What is the probability that at most 4 students have taken chemistry? Round the answer to the nearest thousandth. A)0.008 B)0.438 C)0.562 D)0.665
*Monday, August 11, 2014 at 6:49pm*

**math**

How to write it in expanded form 12.0067 Is this answer right 1*10+2*1+6*1/1000+7*1/10000
*Monday, August 11, 2014 at 6:43pm*

**math**

1. A box contains a number of items, among them exactly 10 hats, 3 books, and 7 statues. The remaining 1/3 of the items are all blue T-shirts. What percent of the items in the box are books?
*Monday, August 11, 2014 at 6:42pm*

**math corrections**

11. If 8x=(4y)^2 and x=8, where y is an integer, which one can be the value of 4y? A.-6 B.4 C.2 D.-4 E.-8
*Monday, August 11, 2014 at 6:35pm*

**math corrections**

30. The probability that Rob wins is 2/7 the probability that Rob loses,what is the probability that Rob loses? A.2/7 B.5/7 C.9/7 D.7/9 E.2/9 Choice B is wrong.
*Monday, August 11, 2014 at 6:31pm*

**math**

How to write it in expanded form 12.0067
*Monday, August 11, 2014 at 6:29pm*

**math**

The average weight of 6 eight graders is 150 pounds and the average weight of 4 7th graders is 120 pounds what is the average weight of the 10 students twostudents
*Monday, August 11, 2014 at 6:07pm*

**math **

There are three complementary angles if the sum of the first two is 62 what is the measure of the third
*Monday, August 11, 2014 at 4:05pm*

**math**

If the measure of one angle of a supplementary pair is 93 what is the measure of the second angle
*Monday, August 11, 2014 at 4:02pm*

**Calculus-Math**

The cost of producing x units of a product is C = 60x + 1350. For one week management determined the number of units produced at the end of t hours during an eight-hour shift. The average values of x for the week are shown in the table. t 0 1 2 3 4 5 6 7 8 x 0 16 60 130 205 ...
*Monday, August 11, 2014 at 2:55pm*

**math**

A polynomial function P is given. P(x) = x4 − 13x2 + 36; [−6, 6] by [−260, 260] Find all solutions of the equation P(x) = 0. (Enter your answers from smallest to largest.)
*Monday, August 11, 2014 at 1:25pm*

**math**

A beam having a length of 20 metres is pivoted at its mid point. A 200 newton load is located at a point 5 m from the right hand end of the beam. A 300 newton load is located at a point 8 m from the right hand end. In order for the beam to be in equilibrium, what load is ...
*Monday, August 11, 2014 at 12:41pm*

**math**

Suppose thatthe joint density of X and Y is given by (x,y)=e-(x/y).e(-y) ,0<x<‡,0<y<‡ and is o otherwise. Find P(X>1 / Y=y)
*Monday, August 11, 2014 at 11:24am*

**math**

The random variable X has probability density function f(x)={ax+bx2 , 0<x<1 . If E(X)=0.6 , find (a)P(X<1/2) and (b)var(x).
*Monday, August 11, 2014 at 11:20am*

**Math**

The marks obtained by a number of students in a certain subject are approximately normally distributed with mean 65 and standard deviation 5. If 3 students are selected at random from this group, what is the probability that at least 1 of them would have scored above 75
*Monday, August 11, 2014 at 10:58am*

**math**

calculate the value of (1 sec20¡ã cot20¡ã)(1-cosec20¡ã tan70¡ã)
*Monday, August 11, 2014 at 10:47am*

**math**

Find the monthly payment for the loan. ( round your answer to the nearest cent.) Finance $950,000 for a warehouse with a 7.50% 30 year loan
*Monday, August 11, 2014 at 2:00am*

**Math **

solve using Cramer's rule 3x+2y=-3 2x+3y=8
*Monday, August 11, 2014 at 12:10am*

**math**

solve the following system of the equations using matrices 10x-5y=4 7x+y=10
*Monday, August 11, 2014 at 12:03am*

**Math **

evalate determinant |-4 -6| |6 8|
*Monday, August 11, 2014 at 12:02am*

**math**

Transcriptionist B is a full-time employee earning $10.00 per hour and an annual salary of $20,800. He transcribes 900 lines per day for a total of 234,000 lines per year. What is the unit medical transcription labor cost for transcriptionist B? Round to the first decimal ...
*Sunday, August 10, 2014 at 10:54pm*

**math **

solve using any appropriate method 10x+y=278 10y+x=107
*Sunday, August 10, 2014 at 10:27pm*

**math **

solve using any appropriate method 0.05x+0.25y=99 0.15x+0.05y=108
*Sunday, August 10, 2014 at 10:26pm*

**Math **

solving using the elimination method 2r-7s=-6 7r_2s=32
*Sunday, August 10, 2014 at 10:19pm*

**Math **

solving using the elimination method 0.3x-0.2y=4 0.2x+0.3y=5/23
*Sunday, August 10, 2014 at 10:16pm*

**math**

If v,w,x,y, and z are consecutive multiples of 3, counting from smallest to largest. What is the value of v-w-x+y in terms of z? A.4z-4 B.-12 C.-30 D.0 E.4z
*Sunday, August 10, 2014 at 9:21pm*

**Math**

At a T.I concert, the ratio of the number of girls to the number of boys is 2:7. If there are 250 more boys than girls, how many girls are at the concert?
*Sunday, August 10, 2014 at 7:47pm*

**maths**

The Cooking Club made some pies to sell at a basketball game to raise money for the new math books.The cafeteria contributed four pies to the sale.Each pie was then cut into five pieces and sold.The were a total of 60 pieces to sell.How many pies did the club make?
*Sunday, August 10, 2014 at 6:52pm*

**Math**

In mr.kingmans math class four fifths of the stundents earned an a on their math exam.the rest of the class earned a b .what percent of the class earned an a ? WhAt percent of the class earned a b
*Sunday, August 10, 2014 at 6:26pm*

**math**

In a high school, 30% of student take physics, 15% of students take chemistry. The rest of students are taking biology. What is minimum student taking biology? A.7 B.8 C.9 D.10 E.11
*Sunday, August 10, 2014 at 4:20pm*

**Math**

Adult tickets for a play cost $18 and child tickets cost $12. If there were 20 people at a performance and the theatre collected $246 from ticket sales, how many adults and how many children attended the play?
*Sunday, August 10, 2014 at 4:11pm*

**math**

If n is positive and n^2=57, between which two number does n lie? A.5 and 6 B.6 and 7 C.7 and 8 D.8 and 9 E.9 and 10
*Sunday, August 10, 2014 at 2:30pm*

**math**

35. If 1<6n<66, and n is a positive integer, what is the greatest possible value for n? A.9 B.10 C.11 D.12 E.13
*Sunday, August 10, 2014 at 2:28pm*

**math**

10.If the average of four positive integers is 12, what is the largest possie value of one of those integers? A.35 B.37 C.40 D.42 E.45
*Sunday, August 10, 2014 at 2:23pm*

**math**

4. How many positive integers less than 100 are divisible by 3,5,7? A.None B.One C.Two D.Three E.Four
*Sunday, August 10, 2014 at 2:22pm*

**math**

3. Nancy can make 5 bags per hour. Sue cna make 6 bags per hour, and Ned can make 12 bags per hour. If Nancy and Sue make 12 bags per hour, and then Ned joins them, how many minutes will it take them to make 149 bags? A.227 B.300 C.360 D.420 E.480
*Sunday, August 10, 2014 at 2:20pm*

**math**

In one year what percent of your time is spent in school? Year=365 days School year=180 days I know that the answer is a little bit over 50%, but I am not too sure about the exact answer.
*Sunday, August 10, 2014 at 1:27pm*

**Math**

A line passes through the points (-10,-4) and (-1,2). What is the slope of the line that passes through the two points?
*Sunday, August 10, 2014 at 1:01pm*

**Math**

expression that is equivalent to -6(x - 3).
*Sunday, August 10, 2014 at 12:06pm*

**math**

a piece of wire 12 meters long is cut into two pieces.one piece is bent into the shape of an equilateral triangle and the other into the shape of a circle.how should the wire be cut so that the combined area of the two figures is as small as possible?
*Sunday, August 10, 2014 at 11:55am*

**math**

how many different rectangles having an area of 81 square centimeters can you draw if the length and width have an integral value?
*Sunday, August 10, 2014 at 8:48am*

**Math**

find the volume of iron require to make an open box whose external dimensions are 36 cm * 25cm* 16.5 cm and 1.5 cm thick throughout. if 1 cm3 of iron weighs 8.5 grams, find the weight of the empty of box in kilograms..
*Sunday, August 10, 2014 at 3:05am*

**math**

What is the value of 4^5 + 4^5 + 4^5 + 4^5 + 4^5 + 4^5 + 4^5 + 4^5 + 4^5 + 4^5 + 4^5 + 4^5 ? a. 12 x 2^5 b. 24^5 c. 3 x 2^5 d. 4^60 e. 3 x 4^6 please answer and explain
*Sunday, August 10, 2014 at 1:55am*

**Math**

A car is going 50mi/h after 5s. The car is traveling 30mi/h about how long does it take the car to stop
*Saturday, August 9, 2014 at 11:04pm*

**Calculus-Math**

The speed S of blood that is r centimeters from the center of an artery is given below, where C is a constant, R is the radius of the artery, and S is measured in centimeters per second. Suppose a drug is administered and the artery begins to dilate at a rate of dR/dt. At a ...
*Saturday, August 9, 2014 at 10:17pm*

**Math: Optimising**

cant figure out this homework question! I need to use optimisation to find the answer but I cant work it out :( There is a rectangular garden which is in need of fencing. Three sides of the 30m wide garden are already fenced. You own an additional 20m of suitable fencing and ...
*Saturday, August 9, 2014 at 7:57pm*

**math**

2^5/2 - 2^3/2
*Saturday, August 9, 2014 at 7:48pm*

**Calculus-Math**

Find d2y/dx2 in terms of x and y. x^2y^2-2x=3
*Saturday, August 9, 2014 at 7:01pm*

**Calculus-Math**

Find an equation of the tangent line to the graph at the given point. 3(x2 + y2)2 = 100(x2 − y2), (4, -2)
*Saturday, August 9, 2014 at 6:44pm*

**Calculus-Math**

The speed S of blood that is r centimeters from the center of an artery is given below, where C is a constant, R is the radius of the artery, and S is measured in centimeters per second. Suppose a drug is administered and the artery begins to dilate at a rate of dR/dt. At a ...
*Saturday, August 9, 2014 at 6:08pm*

**math**

If the number of square inches in the area of a circle is equal to the number of inches in its circumference,the diameter of the circle is a. 4 inches b. 2 inches c. 1 inches d. pi inches e. 2 pi inches please answer and explain
*Saturday, August 9, 2014 at 11:45am*

**math**

The second term of a GP is 81 and the fourth term is 9. Find, (i) the common ratio, (ii) the sum of the first terms, (iii) the sum to infinity.
*Saturday, August 9, 2014 at 11:29am*

**math**

Q1.Navyug industriess Ltd.has annual requirement of 5,000 piece of brake cylinder for its popular brand of golf carts.each brake cylinder has a carrying cost of 25 per unit per year.the ordering cost per order is 800.calculate the total inventory cost for the following values ...
*Saturday, August 9, 2014 at 5:02am*

**math**

Q1.A cooperative store is interested in knowing whether there is any significant difference between the buying habits or male and female shoppers.samples of 14 males and 16 female shoppers gave the following information: male=62,38,43,79,77,23,11,52,33,41,70,49,69,43. ...
*Saturday, August 9, 2014 at 4:50am*

**math**

Q1.manufactures has a mean writing life of 40 pages with a SD of 2 pages. A purchasing agent selects a sample of 100 pens and them to test. The mean writing life for the same was 39 pages. Should the purchasing agent rejects the manufacturer’s claim?
*Saturday, August 9, 2014 at 4:39am*

**Math**

A beach cooler is 2.5 ft long, 1.5ft wide and 2 ft tall. How much ice is needed to fill the cooler at least 1/3 fill? What are the assumptions you make.
*Saturday, August 9, 2014 at 12:46am*

**math**

I have 10 question like this, anybody can show me this one how to do it. Simplify the following and give answers in scientific notation: 0.00320 x 450,000 / 90,000
*Friday, August 8, 2014 at 11:59pm*

**math**

Write the set of integers that satisfy the sentence: I had 10 question for this,anybody can show this one how to do it. 4 > n > 0
*Friday, August 8, 2014 at 11:54pm*

**math**

In a certain boy's camp, 30% of the boys are from New York State and 20% of these are from New York City.What percent of the boys in the camp are from New York City? a. 60% b. 50% c. 33% d. 10% e. 6% please answer and explain
*Friday, August 8, 2014 at 11:25pm*

**math**

If the number of square inches in the area of a circle is equal to the number of inches in its circumference,the diameter of the circle is a. 4 inches b. 2 inches c. 1 inches d. pi inches e. 2 pi inches please answer and explain
*Friday, August 8, 2014 at 11:22pm*

**Calculus-Math**

Complete the table. y = f(g(x)) u = g(x) y = f(u) y = (x + 18)^(-1/2) u = ? y=? Use the chain rule.
*Friday, August 8, 2014 at 9:41pm*

**Calculus-Math**

Complete the table. y = f(g(x)) u = g(x) y = f(u) y = (2x − 4)^7 u = y= This problem involves the chain rule of derivatives.
*Friday, August 8, 2014 at 9:29pm*

**math: optimising**

I cant figure out this homework question! I need to use optimisation to find the answer but I cant work it out :( There is a rectangular garden which is in need of fencing. Three sides of the 30m wide garden are already fenced. You own an additional 20m of suitable fencing and...
*Friday, August 8, 2014 at 9:03pm*

**math**

Mike gave Danny 4 more marbles than he already had. He now has 100 marbles. How many marbles did Mike give to Danny? I dont no the answer
*Friday, August 8, 2014 at 8:33pm*

**Math :)**

Amy can finish the homework in h hours (h>2), what fraction of the homework does she finish in 2 hours?
*Friday, August 8, 2014 at 8:28pm*

**math**

What line is perpendicular to the line y=2/3x+3?
*Friday, August 8, 2014 at 7:55pm*

**Math**

1. The quadratic equation -3x^2 – x = 10 has two real solutions. (true or False) Justify your answer. 2. If (2x – 3) (x + 5) = 8, then either 2x – 3 = 8 or x + 5 = 8. (True or False) Justify your answer.
*Friday, August 8, 2014 at 6:59pm*

**Math**

Cole and Efram are neighbors. Cole is 25 years old and, while they are not the same age, Efram's age contains the same 2 digits. The next time that will happen is in ____ years.
*Friday, August 8, 2014 at 6:08pm*

**Math**

Ken started the day with some money in is pocket. After he took some money out of his bank account, he had $4 more than twice the amount he started with. He then recieved a birthday present which doubled the amount of money he had with him. Ken now had $100 in his pocket. How ...
*Friday, August 8, 2014 at 5:54pm*

**MATH**

0.3X/4 = 0.5/3
*Friday, August 8, 2014 at 5:30pm*

**Math**

How do you expand and simplify (x-2)(x+2)?
*Friday, August 8, 2014 at 5:24pm*

**math**

The ratio of boys to girls in a class room was 9:8. Half of the girls left the classroom, and then there were 15 more boys than girls. A. How many children were in the classroom in the beginning? B. How many girls left the classroom?
*Friday, August 8, 2014 at 1:45pm*

**math**

While cataloging the software library students found that 3/8 of the available programs were in books or magazines. Of the remainder, 2/3 were on disk, and the rest were on cassette tape. If there were 50 programs on cassette tape, how many programs were there in the software ...
*Friday, August 8, 2014 at 1:20pm*

**math**

Example 3: Draw a number line and answer the following questions. (a) Which number will we reach, if we move 3 units to the right of –5? (b) Which number will we reach, if we move 4 units to the left of 3?
*Friday, August 8, 2014 at 12:54pm*

**math**

From a piece of pin in the shape of a square 6 inches on a side, the largest possible circle is cut out. Of the following, the ratio of the area of the circle to the area of the original square is closest in value to A. 4/5 B. 3/5 C. 2/3 D. 1/2
*Friday, August 8, 2014 at 11:40am*

**math**

1.Can a small child play with a fat child onthe see-saw?
*Friday, August 8, 2014 at 11:24am*

**math**

The approximate distance, s, in feet that an object falls in t seconds when dropped from a height is obtained by use of the tormula s = 16r^2. In 8 seconds, the object will fall A. 15384 feet B. 1024 feet C. 256 feet D. None of these
*Friday, August 8, 2014 at 10:53am*

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