Friday

October 31, 2014

October 31, 2014

**Branches of Math**

**Recent Math Questions**

Post a New Question | Current Questions

**Math**

There are a few red and a few green balls in a box, Blind folded, you have to take out 7 balls to have a red for sure,and you have to take out 13 to have a ball from both colours for sure. How many green and how many red balls are there in the box?
*Tuesday, September 16, 2014 at 6:45pm*

**Math**

You complete 3 centimeters on your necklace in an hour. Each hour after the first,you triple the length of the necklace. Write an expression using exponents for the length of the necklace after 3 hours.Then find the length.
*Tuesday, September 16, 2014 at 6:32pm*

**math**

The length of an arc of a circle equals 1/8 of the circle's circumference. What is the diameter of the circle if the length of the arc is 3.14?
*Tuesday, September 16, 2014 at 6:05pm*

**math**

If k/x=b and b-3=ay, which of the following correctly expresses y?
*Tuesday, September 16, 2014 at 6:04pm*

**math**

what is the temperature at the top of the stratosphere if the sea level temperature was 22 degrees and air temperature decreases 6 degrees every 1km
*Tuesday, September 16, 2014 at 6:01pm*

**math**

Frank is 5 years older than Mary. In 5 years, Frank will be twice as old as Mary is now. How old is Mary now?
*Tuesday, September 16, 2014 at 5:54pm*

**math**

A father can do a job in a certain number of hours. His son takes twice as long to do the job. Working together, they can do the job in 6 hours. How many hours does it take the father to do the job alone?
*Tuesday, September 16, 2014 at 5:52pm*

**math**

A car going 60 miles per hour set out on a 400-mile trip at 12:00 P.M. Exactly 20 minutes later, a second car left from the same place and followed the same route. How fast, in miles per hour, was the second car going if it caught up with the first car at 2:00 P.M.?
*Tuesday, September 16, 2014 at 5:40pm*

**math**

The markdown price of a computer game was $45.00, which represented 75% of the original selling price. What was the original selling price?
*Tuesday, September 16, 2014 at 5:36pm*

**Math**

A ball is thrown up at the edge of a 550 foot cliff. The ball is thrown up with an initial velocity of 87 feet per second. Its height measured in feet is given in terms of time t, measured in seconds by the equation h = -16 t^2 + 87 t + 550 a. How high will the ball go and how...
*Tuesday, September 16, 2014 at 4:03pm*

**Math**

The profit in dollars in producing x- items of some commodity is given by the equation P = - 37 x^2 + 1073 x - 7548 . How many items should be produced to break even? (If there are two break-even points, then enter the smaller value of x. Your solution may not be an integer. ...
*Tuesday, September 16, 2014 at 3:51pm*

**Math**

Decide whether each equation has one solution, no solutions, or infinitely many solutions. 3(y-3)=2y-9+y A. One solution B. No Solutions C. Infinitely many solutions I did 3*y 3*3=9 2y=9+4 3-*=-6 x-27 Is the answer A?
*Tuesday, September 16, 2014 at 3:40pm*

**Math**

Decide whether each equation has one solution, no solution, or infinitely many solutions. 2(x-3)=2x A. One Solution B. No solutions C. Infinitely many solutions Is the answer A?
*Tuesday, September 16, 2014 at 3:05pm*

**Math**

Problem: Given any 3 non-collinear points, find the equation of the circle that contains them. 1. You need to select 3 non-collinear points, to use in the solution. The first point will be in quadrant 1, so choose a point with x and y coordinates between 5 and 25 first point:(...
*Tuesday, September 16, 2014 at 1:09pm*

**Math Proof:**

Let a,b exist in the reals with a<b. (i) for the open interval E=(a,b), prove that infE=a and supE=b. (ii) for the closed interval F=[a,b], prove that the infF=a and infF=b.
*Tuesday, September 16, 2014 at 11:57am*

**Math**

1)At 1 p.m., Lin records an outside temperature of –14.8°F. At 3 p.m... she records the outside temperature and notices the temperature had increased by 22.6 degrees. What was the temperature that she recorded at 3 p.m.? ( no multiple choice) *my answer is 7.8* 2) (x...
*Tuesday, September 16, 2014 at 11:37am*

**math**

Find the missing number please 1,8,27,?,125
*Tuesday, September 16, 2014 at 11:08am*

**Math quadratic word problem**

The base of a triangle is 4cm shorter than twice the altitude, find the dimensions if the area is 80sqcm. this is work x(2x-4)=80 2x squared - 4x=80 2x squared -4x-80=0 (2x 8)(x-10) =0 so x= -8 and x=10 my classmate told me its wrong so can you pls help me.,
*Tuesday, September 16, 2014 at 10:46am*

**math**

Two fifths of the instruments in the marching band are brass, one third are percussion, and the rest are woodwinds. A)What fraction of the band is woodwinds? B)One half of the woodwinds are clarinets. What fraction of the band is clarinets? C)One eighth of the brass ...
*Tuesday, September 16, 2014 at 6:28am*

**math**

Two fifths of the instruments in the marching band are brass, one third are percussion, and the rest are woodwinds. A)What fraction of the band is woodwinds? B)One half of the woodwinds are clarinets. What fraction of the band is clarinets? C)One eighth of the brass ...
*Tuesday, September 16, 2014 at 6:18am*

**math**

Minnie has 6 country cds and 5 rock cds amanda has 5 rock cds and 6 country cds who has more cds explain
*Tuesday, September 16, 2014 at 6:03am*

**Math**

Russell planted a flower bed that is 1.6 square meters. Jackie planted a flower bed that is 16 tenths square meters. Draw a quick picture to model the two areas.
*Tuesday, September 16, 2014 at 3:08am*

**math**

0.9 x 5.2 / 0.2 x 25 = ? + 120
*Tuesday, September 16, 2014 at 2:26am*

**math**

what is the purpose of changing radicals to rational exponent and changing rational exponent to radicals?
*Tuesday, September 16, 2014 at 1:10am*

**math**

what is the importance of lowering the index of radicals?
*Tuesday, September 16, 2014 at 1:08am*

**math**

give reasons of solving rational exponent or radicals in terms of, addition, subtraction, multiplication and division.
*Tuesday, September 16, 2014 at 1:05am*

**math**

How to write math paragraph for k+8=5 and, w+12=5 8th grade
*Tuesday, September 16, 2014 at 1:01am*

**math**

This is a floor plan of a building that is 8m tall. It has a flat roof. What is the surface area of the building including the roof. The floor plan is starting from the left the side is 18m the bottom is 27m the right side is 22m. The top looks weird butits like three sections...
*Monday, September 15, 2014 at 11:53pm*

**Math**

You deposit $100 at the end of each quarter in a sinking fund earning 4% compounded quarterly. How many quarterly deposits must you make in order to reach your goal of saving $10,000? Round your answer off to the nearest whole number.
*Monday, September 15, 2014 at 11:22pm*

**Math Problem (please help)**

Consider the following function. g(x) = 6x^4 − 13x^3 − 144x^2 + 325x − 150 (a) Use the zero or root feature of a graphing utility to approximate the zeros of the function accurate to three decimal places. (Enter your answers as a comma-separated list. Round ...
*Monday, September 15, 2014 at 11:16pm*

**math**

amos has 12 action , 15 comedy,. and 9 drama dvds, find the ratio of action dvds to the total number of dvds.
*Monday, September 15, 2014 at 11:14pm*

**math**

The differnce of two numbers is 2 the difference of their squares is 20 find the numbers
*Monday, September 15, 2014 at 11:09pm*

**math**

Simone rents a compact car that gets 31 miles per gallon. When she rents the car, the price of a gallon of gas is $3.10. The cost C of the gas used to drive the car is a function of the number of miles x that the car is driven. The cost of renting the car is $0.10 per mile ...
*Monday, September 15, 2014 at 10:19pm*

**math**

a living room measure 450 x 330cm. find the dimension of the largest square tile that can be used to tile the floor without cutting
*Monday, September 15, 2014 at 10:06pm*

**Math (Ms. Sue! Anyone!)**

1)At 1 p.m., Lin records an outside temperature of –14.8°F. At 3 p.m... she records the outside temperature and notices the temperature had increased by 22.6 degrees. What was the temperature that she recorded at 3 p.m.? ( no multiple choice) *confused on this ...
*Monday, September 15, 2014 at 9:51pm*

**Calculus-Math**

The ordering and transportation cost C for components used in a manufacturing process is approximated by the function below, where C is measured in thousands of dollars and x is the order size in hundreds. C(x) = 12((1/x)+((x)/(x+3))) (a) Verify that C(2) = C(15). C(2) = 54/5 ...
*Monday, September 15, 2014 at 9:49pm*

**Math Problem (please help)**

Find all the zeros of the function. (Enter your answers as a comma-separated list.) f(x) = (x + 3)(x − 7)2 X=
*Monday, September 15, 2014 at 9:47pm*

**Math-PLEASE help me**

If the absolute value of a negative number is 2.78, what is the distance on the number line between the number and its absolute value? Explain your answer.
*Monday, September 15, 2014 at 9:44pm*

**math, algebra**

If a and b are integers when is 1/ab positive? Please help me, I don't know what to do.
*Monday, September 15, 2014 at 9:36pm*

**Math**

what is the base-ten numerals for eleven hundredths
*Monday, September 15, 2014 at 9:32pm*

**math**

can a forest that is 9/10 acre be divided into an even number of plots hat are 1/7 acre? explain how you know
*Monday, September 15, 2014 at 9:32pm*

**math, algebra**

If a and b are integers, when is -1/a positive?
*Monday, September 15, 2014 at 9:32pm*

**Math**

What are different strategies of finding all the factors of a number besides the rainbow method?
*Monday, September 15, 2014 at 9:31pm*

**math**

1)At 1 p.m., Lin records an outside temperature of –14.8°F. At 3 p.m... she records the outside temperature and notices the temperature had increased by 22.6 degrees. What was the temperature that she recorded at 3 p.m.? ( no multiple choice) *confused on this ...
*Monday, September 15, 2014 at 9:18pm*

**Math**

If the absolute value of a negative number is 2.78, what is the distance on the number line between the number and its absolute value? Explain your answer. **I think it would be 2.78 because isn't the absolute value the distance from zero? So wouldn't it be the same? I...
*Monday, September 15, 2014 at 9:17pm*

**Math**

At a selling price of $ 54 , a lamp company breaks even on total sales of $ 3564 . If the company's overhead is $ 396 , find the marginal production cost per lamp and find the profit on sales of 145 lamps.
*Monday, September 15, 2014 at 9:16pm*

**Grade 11 Math functions**

y=x^2-5x+6 Domain= {xeR or 2<x<3 } Range={ } What is the range?? please help! thank you.
*Monday, September 15, 2014 at 9:16pm*

**Math**

The speed of the current in a stream is 4 mi/hr. It takes a canoeist 96 minutes longer to paddle 13 miles upstream than to paddle the same distance downstream. What is the canoeist's rate in still water?
*Monday, September 15, 2014 at 8:56pm*

**Math**

Sarah bought 1.4pounds of seed that costs 0.4 per pound. How much does Sarah pay for the seed? You are suppose to use a 10x10 decimal model
*Monday, September 15, 2014 at 8:34pm*

**Math**

A ramp long rises to a platform. The bottom of the platform is from the foot of the ramp. Find , the angle of elevation of the ramp. Round your answer to the nearest tenth of a degree.
*Monday, September 15, 2014 at 8:27pm*

**Math help**

Explain whether the following given are closed under addition: {x|x ¸ W and x>100}
*Monday, September 15, 2014 at 8:21pm*

**Math**

A pizza box with a square base is to be made from a rectangular sheet of cardboard by cutting six 1-inch squares from the corners and the middle sections and folding up the sides (see the figure). If the area of the base is to be 144 in^2, what size piece of cardboard should ...
*Monday, September 15, 2014 at 8:18pm*

**Math **

How can multiples and factors relate?
*Monday, September 15, 2014 at 7:39pm*

**Math**

Write a word problem using 9 and 10 as factors. Write an equation to solve the problem
*Monday, September 15, 2014 at 7:32pm*

**math**

When this 3 digit number is rounded to the nearest hundred, it rounds to 300. The digit in the ones place is 4. The sum of the digits in the 3 digit number is 11. What is the number?
*Monday, September 15, 2014 at 7:29pm*

**Math**

Lola is placing appetizers on plates She has 63 spring rolls and 84 cheese cubes She wants to include both appetizers on each plate Each plate must have the same number of spring rolls and cheese cubes. What is the greatest number of plates she can make using all of the ...
*Monday, September 15, 2014 at 7:23pm*

**5th grade math**

the park family is staying at a hotel near an amusement park for 3 nights. the hotel costs $129 per night. how much will their 3-night stay in the hotel cost.
*Monday, September 15, 2014 at 7:03pm*

**5th grade math**

vidal bought 2 pizzas and cut each into 8 slices. he and his friends ate 10 slices. write an expression to match the words.
*Monday, September 15, 2014 at 7:01pm*

**Math**

Janelle won 27 tickets at the fair. She traded the tickets in for 9 prizes. each prize was worth the same number of tickets. How many tickets was each prize worth?
*Monday, September 15, 2014 at 6:58pm*

**5th grade math**

Joan has a cafe. Each day she bakes 24 muffins. she gives away 3 and sell the rest. Each day, she also bakes 36 bagels. she gives away 4 and sells the rest. write an expression to represent the total number of muffins and bagels joan sells in 5 days.
*Monday, September 15, 2014 at 6:56pm*

**Math**

There are 8 plates. Jamie puts 9 strawberries on each plate. How many strawberries are on the plate?
*Monday, September 15, 2014 at 6:54pm*

**math**

find the values of the variables 32 40 96 120 112 x 144 180 k 230 how do you do this? what is the formula? Thank you
*Monday, September 15, 2014 at 6:25pm*

**math**

A bicyclist rides off a roof at 15.2 \frac{m}{s}. The roof is 9.8 m above the ground. How far from the edge of the building does the bicyclist land? Use SI units in the second box.
*Monday, September 15, 2014 at 6:19pm*

**math**

A train is going directly South at 60 mph. An action-movie star is atop the train, running North at 6 mph. Relative to someone standing on the ground, how fast is the action-movie star moving, and in what direction? North is positive and South is negative. Use SI units in your...
*Monday, September 15, 2014 at 6:19pm*

**math**

You fire your potato gun horizontally from shoulder height, which is 190 cm above the ground. The potato strikes the ground 30 m away from you. What was the initial speed of the potato?
*Monday, September 15, 2014 at 6:18pm*

**math**

Why is 1 not a prime number?
*Monday, September 15, 2014 at 6:10pm*

**math**

cup 3/4 full 1/6 is poured out. what fractionof the whole bottle is poured out x fractions= whole # .
*Monday, September 15, 2014 at 5:27pm*

**math **

Write -1/9, 4/7, 7/4 in order from least to greatest
*Monday, September 15, 2014 at 4:19pm*

**Math**

Find the distance between points (6, 16) and (–1, 14) to the nearest tenth
*Monday, September 15, 2014 at 4:19pm*

**Math **

Two boats leave whitby harbour at the same time one boat heads 18 km to it's destination and the other boat heads 11 km to its destination. If the boats headed on a course 70 degrees apart, what is the distance between the boats ?
*Monday, September 15, 2014 at 4:13pm*

**Math**

My teacher says to create a St. Ives poem and solve it, but I don't know what to do. Help?
*Monday, September 15, 2014 at 4:10pm*

**math**

what is the halfway point between the following numbers 2000 and 4000
*Monday, September 15, 2014 at 3:54pm*

**Math**

It's greater than 700 000 The sum of all it's digits is 14 It has no zeros The hundreds digit is 3
*Monday, September 15, 2014 at 3:49pm*

**Math Proof**

Prove: Let a,b exist in the reals with a<b, (i) For the open interval E=(a,b) prove that the inf E=a and sup E=b (ii) for the closed interval F=[a,b], prove that inf F=a and sup F=b.
*Monday, September 15, 2014 at 3:47pm*

**math**

60x^4-5x^3+x^2-30/10
*Monday, September 15, 2014 at 3:28pm*

**Math**

Find the other endpoint given the first endpoint and the midpoint A = (3, 5) B = (5, -11) find C
*Monday, September 15, 2014 at 3:19pm*

**7th grade math**

Can you check the following? 1. A recipe for muffins needs 1/2 cup of milk. You are making 3/4 of the recipe. How much milk do you need? Ans: (1/2) / (3/4) = (1/2) x (4/3) = 2/3 cups 2. Betty is running on a track that is 2/3 of a mile long. So far she has run 1/2 of the way ...
*Monday, September 15, 2014 at 2:56pm*

**Math**

explain whether the following given are closed under addition: B={0, 1} T={0, 4, 8, 12, 16, ...} F={5, 6, 7, 8, 9, 10,...} {x|x E W and x>100}
*Monday, September 15, 2014 at 2:52pm*

**Math 221**

A distribution center receives shipment of a product from three different factories in the quantities of 60, 30 and 20. Three times a product is selected at random, each time without replacement. Find the probability that (a) all three products came from the second factory and...
*Monday, September 15, 2014 at 1:11pm*

**Math**

If I want to reflect f(x) = -3x + 5 over the x-axis, would the new equation be f(x) = 3x - 5? Or is it -f(-x) = 3x - 5?
*Monday, September 15, 2014 at 12:55pm*

**Math 221 Week3**

A probability experiment consists of rolling a 6 sided die. Find the probability of the event below: rolling a number less than 3? The probability is
*Monday, September 15, 2014 at 12:49pm*

**Math 221 Week3**

A distribution center receives shipment of a product from three different factories in the quantities of 60, 35 and 25. Three times a product is selected at random, each time without replacement. Find the probability that (a) all three products came from the second factory and...
*Monday, September 15, 2014 at 12:36pm*

**8th grade math **

what is 5² / 5⁵ = ? other options are: a) 5¹ b) 5³ c) 5⁴ d) 5² **** Is 5² right?
*Monday, September 15, 2014 at 12:15pm*

**Math**

The observation for three materials shows: Material A absorbs all the visible light (opaque) Material B is transparent to all the visible light (transparent) Material C absorbs blue light but is transparent to red light. (Blue light has wavelength 0.4 m, red light has ...
*Monday, September 15, 2014 at 10:48am*

**Math using quadratic equation**

The freight train runs 12miles per hour than a passenger train. It runs 65miles in the same time that the passenger train runs 165miles find the rate of each train. I dont really know the formula using quadratic im sorry
*Monday, September 15, 2014 at 7:36am*

**Math using Quadratic equation**

The area of a square is 196cm2(squared), find the measure of one side. Thank you,, this is my assign. In math1, im using the formula A=s*s but i need to solve this using quadratic equation.
*Monday, September 15, 2014 at 7:27am*

**math**

Suppose someone gives you 8 to 2 odds that you can not roll two even numbers with the roll of two fair dice. This means you win $8 if you succeed and you lose $2 if you fail. What is the expected value of this game to you? Should you expect to win or lose the expected value in...
*Monday, September 15, 2014 at 3:20am*

**math**

A point,X ,is 25 feet from the center of a circle.If the diameter of the circle is 14 feet,what is the length (in feet)of a tangent from point X to the circle? a. square root 29 b. 18 c. 15 square root 2 d. 24 e. square root 673 please answer and explain
*Sunday, September 14, 2014 at 10:47pm*

**physics, math**

Part A & B are 0.10m apart. A point charge of +3.0*10^-9C is placed at A and a point charge of +1.0*10^-9C is placed at B. X is a point on the straight line through A and B. If a third charge C or charge 1.5*10^-9 is placed at X, where must X be for the resultant force to be ...
*Sunday, September 14, 2014 at 9:43pm*

**Math**

How do you write the transformation of a quadratic function two units right from its parent function? Is it y = (x + 2)^2?
*Sunday, September 14, 2014 at 9:14pm*

**Math**

A Social Security number has seven digits. How many Social Security numbers are possible?
*Sunday, September 14, 2014 at 9:14pm*

**Math**

An exam consists of six true-or-false questions. Assuming that every question is answered, in how many different ways can a student complete the exam? In how many ways may the exam be completed if a penalty is imposed for each incorrect answer, so that a student may leave some...
*Sunday, September 14, 2014 at 9:11pm*

**Math**

What is the definition of a multiple
*Sunday, September 14, 2014 at 9:07pm*

**math**

given the domain of g(x) is (-3,5) and the range of g(x) (-10, 10) find the domain and range of the transformed function 4g(x-7)+12
*Sunday, September 14, 2014 at 8:46pm*

**Math**

Use the quadratic formula to solve the equation for x in terms of y and y in terms of x. (Enter your answers as a comma-separated list. If there is no solution, enter NO SOLUTION.) 2x^2 + 7xy + 1 − y^2 = 0 (a) x in terms of y x = (b) y in terms of x y =
*Sunday, September 14, 2014 at 8:31pm*

**Math**

A box with an open top is to be constructed by cutting a-inch squares from the corners of a rectangular sheet of tin whose length is twice its width. What size sheet will produce a box having a volume of 32 in^3, when a = 2? width in length in
*Sunday, September 14, 2014 at 8:30pm*

**Math**

A pizza box with a square base is to be made from a rectangular sheet of cardboard by cutting six 1-inch squares from the corners and the middle sections and folding up the sides (see the figure). If the area of the base is to be 144 in^2, what size piece of cardboard should ...
*Sunday, September 14, 2014 at 8:28pm*

**Quick math help**

An angle with a measure of 89.9 degrees... Would it be a right or an acute angle?
*Sunday, September 14, 2014 at 7:51pm*

**PLEASE HELP! Math**

I really need help with this one question on my math pretests and I have no idea what to do! The question is: Mandy begins bicycling west at 30 miles per hour at 11:00 am. If Liz leaves from the same point 20 minutes later bicycling west at 36 miles per hour, when will she ...
*Sunday, September 14, 2014 at 7:40pm*

**Math**

12 cards are drawn with replacement from an ordinary deck of 52 cards. What is the probability that 4 queens of hearts, 4 aces of spades, and 4 kings of clubs are drawn?
*Sunday, September 14, 2014 at 7:34pm*

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