Thursday

January 29, 2015

January 29, 2015

**Branches of Math**

**Recent Math Questions**

Post a New Question | Current Questions

**math**

The overall probability of a student failing an exam is 40%. Calculate the probability that in a group of 6 students, at least 4 passed the exam.
*Saturday, December 13, 2014 at 5:20pm*

**math**

n^2-4/n^2-2n * n/n^2+10n+16 simplify and state the domain
*Saturday, December 13, 2014 at 5:14pm*

**math**

Fourteen and a third cream cakes were eaten for dessert! How many sixths of cream cake is this in total ?
*Saturday, December 13, 2014 at 4:09pm*

**math**

April is training for a marathon by running no less than 55 km per week. She runs at an average rate of 10 km per hour. What is the minimum number of hours, h, she should run? 10h ≥ 55; h ≥ 5.5; 5.5 hours 10h ≤ 55; h ≤ 5.5; 5.5 hours h over ten > 55...
*Saturday, December 13, 2014 at 3:37pm*

**math**

5.6 lb/gal = oz/gal
*Saturday, December 13, 2014 at 3:09pm*

**math**

a vector parallel to the line of intersection of the planes. x-2y-z=6 and 3x-y+z=4 the answer is <3,4,-5> so first, I took the cross product of <1,-2,-1> and <3,-1,1> which I think is v. in the equation p0 + tv. << this is the equation for the line of ...
*Saturday, December 13, 2014 at 12:16pm*

**math**

a job pays a salary of $19,00 the first year. during the next 10 years the salary increases by 4% each year. what is the lifetime salary over the 11 year period?
*Saturday, December 13, 2014 at 12:05pm*

**math**

A rectangular tank of 5 m long,4 m wide and 5 m high is filled with water to a depth 3 m. If a robot of volume 20 cubic metre is added to the tank, how much will the water level rise?
*Saturday, December 13, 2014 at 5:54am*

**math**

Ivan bought 8 pounds of flour for $4 . How many pounds of flour did he get per dollar?
*Saturday, December 13, 2014 at 1:33am*

**math **

what are two fractions both not positive who has a product of 5/8
*Saturday, December 13, 2014 at 1:18am*

**math **

Determine the height and radius of cylinder of volume 512 cm3 which has the least total surface area
*Saturday, December 13, 2014 at 12:27am*

**Math**

Use differentials (or equivalently, a linear approximation) to approximate sin(27 degrees) as follows: Let f(x) = sin(x) and find the equation of the tangent line to f(x) at a nice point near 27 degrees. Then use this to approximate sin(27 degrees).
*Friday, December 12, 2014 at 11:29pm*

**Math**

Expand and simplify: (5r - 6s + s2) (13r + 3s - 5s2) I got 65r^2-25rs^2+78rs+18s^2+3s^3+5s^4 but it's wrong?! Please correct me!
*Friday, December 12, 2014 at 10:17pm*

**Math help!**

Annual deposits of $3150 are made into a bank account earning 4 % interest per year. (a) What is the balance in the account right after the 15th deposit if interest is calculated annually? (b) What is the balance in the account right after the 15th deposit if interest is ...
*Friday, December 12, 2014 at 9:58pm*

**Math**

You have an ear infection and are told to take a 200 mg tablet of ampicillin (a common antibiotic) four times a day (every six hours). It is known that at the end of six hours, about 5% of the drug is still in the body. What quantity of the drug is in the body right after the ...
*Friday, December 12, 2014 at 9:42pm*

**Math**

A basketball player received a contract from the New York Knicks in which he was offered $5 million a year for ten years. Determine the present value of the contract on the date of the first payment if the interest rate is 3 % per year, compounded continuously. Round your ...
*Friday, December 12, 2014 at 9:42pm*

**College math 100**

A midwestern music competition awarded 40 ribbons.The number of blue ribbons awarded was 2 less than the number of white ribbons. The number of red ribbons was 3 more than the white ribbons. How many of each kind of ribbons was awarded?
*Friday, December 12, 2014 at 9:32pm*

**Math**

5 Σ 4(3/4)^k k=0 Find the sum of the series. Round the answer to three decimal places.
*Friday, December 12, 2014 at 8:10pm*

**Math**

A basketball player received a contract from the New York Knicks in which he was offered $5 million a year for ten years. Determine the present value of the contract on the date of the first payment if the interest rate is 3 % per year, compounded continuously. Round your ...
*Friday, December 12, 2014 at 7:12pm*

**Math**

You have an ear infection and are told to take a 200 mg tablet of ampicillin (a common antibiotic) four times a day (every six hours). It is known that at the end of six hours, about 5% of the drug is still in the body. What quantity of the drug is in the body right after the ...
*Friday, December 12, 2014 at 7:11pm*

**Math**

1/27 + 1/9 + 1/3 + ... + 81 I know the series is geometric. d = 1/3 Multiplying each by 1/3 to get the next value do i use the sum of geometric series a(1-r^n)/ 1-r
*Friday, December 12, 2014 at 6:57pm*

**Math**

5) A car manufacturer has manufacturing plants in 3 major cities. Below are the daily amounts of cars produced per plant for 3 different model types. (matrix A) Model X Model Y Model Z Plant A 12 10 0 Plant B 4 4 20 Plant C 8 9 12 Due to wage increases, the April profits are ...
*Friday, December 12, 2014 at 6:47pm*

**Math**

The relative value of currencies fluctuates every day. When this problem was written, one Netherland Antillean Guilder (Used on the Caribbean island of CuraÇao) was worth .558659 US dollar. a. Find a function that gives the U.S. dollar value f(x), of x Netherland ...
*Friday, December 12, 2014 at 6:44pm*

**Math**

2) A car dealership advertises a 15% discount on all its new cars. In addition, the manufacturer offers a $1000 rebate on the purchase of a new car. Let x represent the sticker price of the car. a. Suppose only the 15% discount applies. Find a function f that models the ...
*Friday, December 12, 2014 at 6:44pm*

**Math**

A boy is dividing M&Ms between himself and his sister. He gives 2 to his sister and takes 2 for himself. He gives 2 to his sister and takes 4 for himself. He gives 2 to his sister and takes 6 for himself, and so on. (b) After n rounds, how many M&Ms does his sister have and ...
*Friday, December 12, 2014 at 6:41pm*

**Math Check!!**

Annual deposits of $3150 are made into a bank account earning 4 % interest per year. Round all answers to two decimal places (a) What is the balance in the account right after the 15th deposit if interest is calculated annually? For this I know the formula is A = P(1 + R/N)^Nt...
*Friday, December 12, 2014 at 6:37pm*

**Math**

In the polynomial 7.08x^4 - 126.92x^3 + 595.95x^2 - 241.81x + 2780.54, an x-value of 16 will give: 95,605?
*Friday, December 12, 2014 at 5:04pm*

**math**

. Darya's car averages 36 miles per gallon. How many gallons of gas will she need for a 480-mile trip? What is the cost of the gas she needs if gas costs $3.12 per gallon?
*Friday, December 12, 2014 at 4:22pm*

**math**

Find the measure of the interior angle in a regular polygon if the ratio of the sum of the measures of the interior angles to the sum of the measures of the exterior angels is 4
*Friday, December 12, 2014 at 3:04pm*

**Math**

In the polynomial 7.08x^4 - 126.92x^3 + 595.95x^2 - 241.81x + 2780.54, an x value of 10 will give: 95,605?
*Friday, December 12, 2014 at 2:32pm*

**Math**

9 6/8 = n+ 2 1/8
*Friday, December 12, 2014 at 12:59pm*

**Math**

One box measure 7 meters by 15 meters by 8 meters. Another box measure 8 meters by 9 meters by 10 meters. by how many cubic meter is the volume of box greater than the other?
*Friday, December 12, 2014 at 11:32am*

**Business Math**

Alicia borrowed $8,500 at 6% ordinary interest for 180 days. After 40 days, she made a partial payment of $2,000. After another 70 days, Alicia made a second partial payment of $2,000. What is the final amount due on the loan? a. $4,687.21 b. $4,684.62 c. $4,500.50 d. $4,755.00
*Friday, December 12, 2014 at 10:45am*

**math**

one radio station broadcast a weather forecast every 18 minutes and another station broadcast a commercial every 15 minutes. If the stations both a weather forecast and😛a commercial at noon,when is the next time that both will be broadcast at the same time
*Friday, December 12, 2014 at 9:19am*

**Math**

A full bottle of juice costs $2.00.If the cost of the juice is $1.50 more than the cost of the bottle, how much does the empty bottle cost? Hint: Answer is not 50 cents
*Friday, December 12, 2014 at 9:17am*

**math**

There were 845 million facebook users in 2011 and 608 million in 2010. What is the percent since Facebook is now used by 1 in every 13 people on earth? is the answer:7.69% 1 x x - - 13 100
*Friday, December 12, 2014 at 8:24am*

**math**

Three friends each have some ribbon. Carol has 42 inches of ribbon, Tino has 2.5 feet of ribbon, and Baxter has 1.5 yards of ribbon. Express the total legth of ribbon the three friends havein inches, feet and yars. **We are learning to use Unit Rates & Conversion Factors to ...
*Friday, December 12, 2014 at 3:46am*

**math**

lily estimated a quotient of 120 and found an actual of quotient of 83 what should she do next ? explain please?
*Friday, December 12, 2014 at 2:30am*

**math **

A student reader is making $7.20 per hour and gets a $0.64 raise. What is the percent increase? (Round to the nearest tenth of a percent.)
*Friday, December 12, 2014 at 2:28am*

**Math**

Centerville is the headquarters of Greedy Cablevision Inc. The cable company is about to expand service to two nearby towns, Springfield and Shelbyville. There needs to be cable connecting Centerville to both towns. Centerville is located at (10,0) in the xy-plane, Springfield...
*Friday, December 12, 2014 at 1:46am*

**Math**

Am I correct on these? 1.Does every line have both an x-intercept and a y-intercept? Yes. 2.Does every line have an infinite number of lines that are parallel to the given line? Yes. Does every line have an infinite number of lines that are perpendicular to the given line? No.
*Friday, December 12, 2014 at 12:52am*

**Math**

A 6-pack of undershirts costs $13.69. This is $3.96 less than the cost of buying 6 individual shirts. If each undershirt costs the same amount, how much does each undershirt cost when purchased individually?
*Friday, December 12, 2014 at 12:41am*

**Math**

Centerville is the headquarters of Greedy Cablevision Inc. The cable company is about to expand service to two nearby towns, Springfield and Shelbyville. There needs to be cable connecting Centerville to both towns. Centerville is located at (10,0) in the xy-plane, Springfield...
*Thursday, December 11, 2014 at 11:50pm*

**math**

The perimeter of a rectangle is 72. the length of the rectangle is twice the width. Find the dimensions of the rectangle.
*Thursday, December 11, 2014 at 11:29pm*

**math**

two integers, x and y have a product of 20. what is the least possible sum of x and y?
*Thursday, December 11, 2014 at 11:12pm*

**Math**

Radical ((1-sinx)/(1+sinx))= (1-sinx)/cosx (absolute) Identity identity
*Thursday, December 11, 2014 at 11:08pm*

**Math**

1/2 * 6 + 9^2 - (18/6) = 42 Is my answer correct?
*Thursday, December 11, 2014 at 10:14pm*

**math**

I have a math question.two fielda ats state park are 1000 meters from each other.on a map,the two fields are 8 centimeters apart.What scale is the map using?is it the metric scale??
*Thursday, December 11, 2014 at 10:09pm*

**math**

a rectangle has an area of 20 square feet. A similar rectangle has an area of 180 sq feet. What is the ratio of the area of these similar rectangles? Is it 9 or maybe 3000??? Not sure. Please help....
*Thursday, December 11, 2014 at 9:59pm*

**Math**

Lora's gymnastics class practices floor exercises every other day. The class practices on the balance beam every third day, the uneven bars every fourth day. Today is March 10, and the class practiced all 3 events.How many more times, before June 1, will the class practice...
*Thursday, December 11, 2014 at 9:47pm*

**math**

noel started going to yoga class on november 3, and went every third day after that. Lana also started classes on november 3, and went every fourth day after that. In how many days will they be in class together again?
*Thursday, December 11, 2014 at 9:27pm*

**Math**

Use the digits 4'5'6'7' and 8 once each to write an odd five-digit number . Write it both in standard form and in word form
*Thursday, December 11, 2014 at 9:26pm*

**Math**

A fence is to be built to enclose a rectangular area of 310 square feet. The fence along three sides is to be made of material that costs 3 dollars per foot, and the material for the fourth side costs 14 dollars per foot. Find the dimensions of the enclosure that is most ...
*Thursday, December 11, 2014 at 9:23pm*

**Math- Geometry**

Given: Angle ABC is a right triangle with hypotenus AB D,E and F are midpts of the sides of the triangle Proof: a. CDEF is a rectangle b. EC is half of AB
*Thursday, December 11, 2014 at 9:19pm*

**Math **

Can you subtract two negative numbers and get a positive difference? What are some examples, if it's possible? Can you add two negative numbers and get a positive sum? (I fairly certain it's not possible, but I'm not sure how to explain why it's not...)
*Thursday, December 11, 2014 at 9:11pm*

**Math**

A fence is to be built to enclose a rectangular area of 310 square feet. The fence along three sides is to be made of material that costs 3 dollars per foot, and the material for the fourth side costs 14 dollars per foot. Find the dimensions of the enclosure that is most ...
*Thursday, December 11, 2014 at 9:08pm*

**Math**

Which is independent and which is dependent? The cost or the shirt?
*Thursday, December 11, 2014 at 9:04pm*

**math**

A store sells snacks by weight. A six ounce bag of mixed nuts costs $3.60. Will a two ounce bag of nuts cost more than or less than $1.25?
*Thursday, December 11, 2014 at 9:01pm*

**Math**

X is 1 2 3 4 5 Y is 98 96 94 92 90 What is Domain and Range? I know that Domain is all x and Range is all y but how would I put Domain and Range as an inequality
*Thursday, December 11, 2014 at 8:35pm*

**Math**

When Curtis was born, his parents began depositing $1000 at the end of every year into an annuity to save for his college education. If the account paid 7% compounded annually for the first 10 years and then dropped to 5% for the next eight years, how much is the account worth...
*Thursday, December 11, 2014 at 8:32pm*

**math**

Javia ran 8 laps to run a total of amile on monday how many laps will she need to run Tuesday to run 3/8 of a mile
*Thursday, December 11, 2014 at 8:30pm*

**Math-Calculus**

Find the point on the line -2x + 4y + 3 =0 which is closest to the point (-2,1). Note: I have been struggling on this for hours!
*Thursday, December 11, 2014 at 8:14pm*

**Math**

Ned folded a set of oragami figures. Of this set, 5/8 are cranes and 1/6 of the remainder are frogs. The rest are grasshoppers. What fraction of the origami figures are grasshoppers?
*Thursday, December 11, 2014 at 7:32pm*

**Math**

You had 13 of your allowance left on Monday. On Tuesday, you spent 13 of that amount of money. On Wednesday, you spent 13 of what you spent on Tuesday. What fraction of your total allowance did you spend on Wednesday?
*Thursday, December 11, 2014 at 7:30pm*

**Math**

Young and Company owes bond holders $5,500 interest at the end of each quarter for the next five years. How much must they deposit now at 8% interest compounded quarterly to yield an annuity payment of $5,500? -- I am pretty sure I know how to do the problem but I am just ...
*Thursday, December 11, 2014 at 7:24pm*

**3rd grade math**

Anna uses 1 eraser for every 2 packs of pencils she uses. If she uses 10 packs of pencils in a year, how many erasers will she use?
*Thursday, December 11, 2014 at 7:22pm*

**Math **

Sandy is buying t-shirts for her school's club. Company A charges 5.80 per shirt with no set up fee. Company B charges 5.75 per shirt plus a $35 set up fee
*Thursday, December 11, 2014 at 7:02pm*

**math**

how can we check that 46/100 is equal to about 39/85?
*Thursday, December 11, 2014 at 7:00pm*

**Math**

The temperature increased 56 in 4 hours , what was the change in temperature per hour
*Thursday, December 11, 2014 at 6:58pm*

**Math **

Malik is 10 years less than half his mothers age. I Malik is 12 years old, how old is his mother
*Thursday, December 11, 2014 at 6:38pm*

**7th grade math**

Anna walked 8 miles in 3 hours. Juan walked 14 miles in 5 hours. Are these rates in proportion? 8/3 divided 3/3 = 2.66/1= 2.66 14/5 divided 5/5= 2.80/1= 2.80
*Thursday, December 11, 2014 at 6:14pm*

**grade 10**

guys I don't know what career i can do coz I chose math literary - business studies-geography- tourism so if you can help mi plz guyz
*Thursday, December 11, 2014 at 6:08pm*

**Math **

The perimeter of a rectangle is 60cm. It's length is 6cm. What is its width?
*Thursday, December 11, 2014 at 5:57pm*

**Math**

A soccer team won two of its first twelve games.The team ended the season winning exactly half of the games it played.What is the fewest number of games the team could have played
*Thursday, December 11, 2014 at 5:07pm*

**Math**

How much does the cart weigh? Jason was hauling concrete blocks in a cart. When he had one block in the cart, the total weight of the cart with the block was 55 pounds. When he had 4 blocks in the cart, the total weight of the cart and the blocks was 146.5 pounds. How much did...
*Thursday, December 11, 2014 at 4:50pm*

**Math**

prove: 1/log(base36)a = 2/log(base6)a i made a common base and then multiplied both sides with log(base6)a to get 2=log(base6)a/log(base6^2)a but this is as far as i can figure.
*Thursday, December 11, 2014 at 4:45pm*

**Algebra**

Could you double check my math problem please? Thanks 4) −15 + n = −9 MY ANWSER: 6. Thank you :)
*Thursday, December 11, 2014 at 3:40pm*

**math**

The length of a piece of paper is 8.5 inches. Using scissors, you reduce the length of the paper to 4.25. What is the scale factor of the dilation? A- 1/4 B- 1/2 C- 2 D- 4 I think its A ?
*Thursday, December 11, 2014 at 3:40pm*

**Math**

In 1974, Johnny Miller won 8 tournaments on the PGA tour and accumulated $353,022 in official season earnings. In 1999, Tiger Woods accumulated $6,616,585 with a similar record. (a) Suppose the monthly inflation rate from 1974 to 1999 was 0.0079. Use the compound interest ...
*Thursday, December 11, 2014 at 3:24pm*

**math**

I go to Conexus and I am super duper behind do you happen to have the answers for the proportions quiz???????? PLEASE A c d c b a d
*Thursday, December 11, 2014 at 3:14pm*

**Middle School Math**

My home work problem is 3g+5=17 my answer is -20. A I correct.
*Thursday, December 11, 2014 at 2:31pm*

**math **

a baseball played 120 games during a season. The ratio of the number of games won to the total number of games played is 2/3. how many games did the team lose during the season? 120/1=2/3 360 divided by 2=180 or 120/x =2/3, 120 divided by 2 = 60
*Thursday, December 11, 2014 at 2:23pm*

**math**

A tree is 33 and one third ft tall. Why?
*Thursday, December 11, 2014 at 2:01pm*

**math show work please**

a bacteria colony doubles in 7hrs. How long does it tae the colony to triple Use N=No2^t/T. where No is the intial number of bacteria and T is the time in hours it take the colony to double.
*Thursday, December 11, 2014 at 1:48pm*

**math**

0.3 ÷ 0.06 Simplify the expression
*Thursday, December 11, 2014 at 1:44pm*

**math**

Four times the difference of 17 and a number is 84. Which equation below can be used to find the unknown number?
*Thursday, December 11, 2014 at 1:35pm*

**math**

A store sells small notebooks for $8 and large notebooks for $10. If you buy 6 notebooks and spend $56, how many of each size notebook did you buy? my answer: 7 small notebooks and 5 large notebooks is this right?
*Thursday, December 11, 2014 at 12:41pm*

**Math**

Your fishing bobber oscillates up and down from the current in the river in a harmonic motion. The bobber moves a total of 5.0 inches from its high point to its low point then returns up to the high point every 5 seconds. Write an equation modeling the motion of the bobber at ...
*Thursday, December 11, 2014 at 11:34am*

**Math**

A souvenir shop sells about 200 coffee mugs each month for 6$ each. The shop owner estimates that for each $0.50 increase in the price, he will sell about 10 fewer coffee mugs per month. a. How much should the owner charge for each mug in order to maximize the monthly income ...
*Thursday, December 11, 2014 at 11:28am*

**Math**

The function f(t)=37sin(pi/3 -5)+81 is used to represent the changes in temperature of a chemical compound used in a lab. What is the amplitude? I got 5, is this correct. I have the options of 81, 5, 6pi, 37, and 2
*Thursday, December 11, 2014 at 11:18am*

**Math**

Write the following comparison as a ratio reduced to lowest terms. 25 nickels to 38 dimes?
*Thursday, December 11, 2014 at 10:57am*

**Math **

At the amusement park, you decide to ride the Ferris wheel, which has a maximum height of 50 meters and a diameter of 35 meters. It takes the wheel 13 minutes to make one revolution. Write the sinusoidal function, f(t), that models the height of your chair at any time, t I got...
*Thursday, December 11, 2014 at 10:47am*

**Math**

What is the domain of this function f(x)=sin^-1 x?
*Thursday, December 11, 2014 at 10:36am*

**math**

the ratio of boys to girls in a club is 7:4, there are 21 fewer girls than boys , what is the total number of children in the club?
*Thursday, December 11, 2014 at 8:52am*

**Math**

What is 7r + -5
*Thursday, December 11, 2014 at 6:18am*

**math**

The Eye on Malaysia Park charges ticket for RM14 for an adult and RM8 for children. During the school holiday, the price of the children's ticket increased for about quarter than its normal price while the prices of adult's ticket are double. December last year, the ...
*Thursday, December 11, 2014 at 6:00am*

**math**

cylindrical tank of radius 4m and 7m high.if poured into the tank of 6m diameter .how high is the water?
*Thursday, December 11, 2014 at 3:47am*

**math**

what fraction must be added to the difference of 5/6 and 2/3 to have an average of 1/4
*Thursday, December 11, 2014 at 3:42am*

**math 120**

A recent poll of a random sample of 400 students at a public 4-year college showed the average (mean) amount of time spent using email was 49 minutes per day with a standard deviation of 44 minutes. a. find a 95% confidence interval fot the population mean
*Thursday, December 11, 2014 at 1:59am*

**6TH GRADE MATH**

Create a number line model that represents the equation below. -5 x -2 = 10 Can some help me please?
*Thursday, December 11, 2014 at 1:18am*

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