Friday

December 19, 2014

December 19, 2014

**Branches of Math**

**Recent Math Questions**

Post a New Question | Current Questions

**math**

Megan is making bracelets to sell to earn money for the local animal shelter It takes her 1/4 hour to pick out all the beads and 1/10 hour to string them. This week, she only has 5 1/4 hours to make bracelets. How many bracelets will Megan be able to make? **We have to use ...
*Monday, December 15, 2014 at 3:14pm*

**Math HELP!**

Consider the function y = 3x5 – 25x3 + 60x + 1. Use the first or second derivative test to test the critical points. How many relative maxima did you find? 0 1 2 <--- 3 4
*Monday, December 15, 2014 at 3:04pm*

**Math**

What do you do to check whether a number is rational or irrational? In your explanation, use an example of an irrational and a rational number. How does finding the square root of a number compare to finding the cube root of a number? Use the number 64 in your explanation
*Monday, December 15, 2014 at 2:59pm*

**math**

In the equation 1/5 (x-50)=25 X represents the number of pages of a book.
*Monday, December 15, 2014 at 1:46pm*

**Math**

Natalia constructed a right triangle with two side lengths measuring 3 and 5 units. She constructed a second right triangle similar to the first one, with the two corresponding sides measuring 5.1 and x units in length, respectively. What is the missing length, x, of the ...
*Monday, December 15, 2014 at 1:41pm*

**Car Design**

What other subject area is used with art for a career in car design? Language Arts history math health I think math
*Monday, December 15, 2014 at 1:40pm*

**Any math tutor online? Help**

Two companies charge these rates for printing a brochure : Company A charges $175 for set up and 0.10 pet brochure Company B charges $250 for set up and 0.07 pee brochure A linear system that model this situation is C=175 + 0.10n C =250+ 0.07 Where c is the total A) graph the ...
*Monday, December 15, 2014 at 1:17pm*

**Math**

Laverne starts counting out loud by 5's. She starts with 7. As Laverne counts, Shirley sums the numbers Laverne says. When the sum finally exceeds 5000, Shirley runs screaming from the room. What number did Laverne last say before Shirley flees?
*Monday, December 15, 2014 at 12:59pm*

**Math **

Penn writes a 2013-term arithmetic sequence of positive integers, and Teller writes a different 2013-term arithmetic sequence of integers. Teller's first term is the negative of Penn's first term. Each then finds the sum of terms in his sequence. If their sums are ...
*Monday, December 15, 2014 at 12:57pm*

**statistic math heeeeeeelpppppppppp**

A random sample of 20 people who resided within the u.s resulted in average viewing time of 4.76 hrs per day with a sample standard deviation of 2.297 hrs. obtain and interpret a 95% confidence interval, for the mean viewing time of all americans confidence interval: Interpert...
*Monday, December 15, 2014 at 12:37pm*

**Math**

students planted 6 equal-size gardens, they divided each garden into 3 equal sections and planted herbs in 2 of the 3 sections, what fraction of the gardens did the students plant with herbs? Shouldn't it be 2/6?
*Monday, December 15, 2014 at 10:21am*

**Math**

Simplify the expression. 3x + 4(x - 6) - 3(x - 7) A. 4x - 45 B. 4x - 3 C. 10x - 3 D. 10x + 45 Is it b?
*Monday, December 15, 2014 at 10:09am*

**Math **

13pi/12=________ degrees: Round to the nearest hundredth.
*Monday, December 15, 2014 at 8:03am*

**math**

The area of square field is half hectare. Find the length of its diagonal in meter
*Monday, December 15, 2014 at 8:01am*

**7th grade math**

Can you check these? 3. Simplify (56/8+3)*2-1 = (7+3)*2-1 = 10*2-1 = 20-1 = 19 9. A spool of lanyard is 21 yards long. If it is cut into pieces that are each 1.75 yards long, how many pieces of lanyard will there be? Ans:21/1.75 = 12 pieces 12. (3/5)x - 10 = 1/6 Ans: (3/5)x = ...
*Monday, December 15, 2014 at 7:23am*

**Calculus (math)**

The volume of the solid obtained by rotating the region enclosed by y=1/x4,y=0,x=1,x=6 about the line x=−2 can be computed using the method of cylindrical shells via an integral. it would be great if you can just even give me the function inside that I need to take the ...
*Monday, December 15, 2014 at 1:02am*

**Calculus (math)**

The velocity function (in meters per second) for a particle moving along a line is given by v(t)=t3−5t2. Find the displacement and the distance traveled by the particle during the time interval [-1,6]. Distance traveled = ?? I got 2089/12m as answer but it was incorrect ...
*Sunday, December 14, 2014 at 11:45pm*

**math**

Select the approximate values of x that are solutions to f(x) = 0, where f(x) = -8x2 + 6x + 3.
*Sunday, December 14, 2014 at 11:20pm*

**Calculus (math)**

A bacteria culture grows with constant relative growth rate. The bacteria count was 784 after 2 hours and 117649 after 6 hours. What is the relative growth rate? What was the initial size of the culture? Find an expression for the number of bacteria after t hours. Find the ...
*Sunday, December 14, 2014 at 10:26pm*

**Calculus (math)**

Warfarin is a drug used as an anticoagulant. After administration of the drug is stopped, the quantity remaining in a patient's body decreases at a rate proportional to the quantity remaining. Suppose that the half-life of warfarin in the body is 35 hours. Write a ...
*Sunday, December 14, 2014 at 10:23pm*

**Calculus (math)**

A tank in the shape of an inverted right circular cone has height 7 meters and radius 4 meters. It is filled with 5 meters of hot chocolate. Find the work required to empty the tank by pumping the hot chocolate over the top of the tank. The density of hot chocolate is δ=...
*Sunday, December 14, 2014 at 10:20pm*

**Calculus (math)**

A group of engineers is building a parabolic satellite dish whose shape will be formed by rotating the curve y=ax2 about the y-axis. If the dish is to have a 8-foot diameter and a maximum depth of 2 feet, find the value of a and the surface area (in square feet) of the dish.
*Sunday, December 14, 2014 at 10:17pm*

**Calculus (math)**

Consider the area between the graphs x+3y=35 and x+5=y^2. This area can be computed in two different ways using integrals
*Sunday, December 14, 2014 at 9:52pm*

**Calculus (math)**

Consider the area between the graphs x+3y=35 and x+5=y2. This area can be computed in two different ways using integrals
*Sunday, December 14, 2014 at 9:51pm*

**Math**

5 rad = _____ degrees: Round to the nearest hundredth if necessary 5pi/8 = ________ degrees: Round to the nearest hundredth if necessary
*Sunday, December 14, 2014 at 9:50pm*

**Math**

If sin=8/17, find cos.
*Sunday, December 14, 2014 at 9:49pm*

**7th grade math**

Can you check these additional problems? 36. 10 - h >= 21 -h >= 21 - 10 -h >= 11 h >= -11 38.p + 8.5 > 1 p > 1 - 8.5 p > -7.5 40. 8-2(5-9g) = -128 8 - 10 + 18g = -128 -2 + 18g = -128 18g = -128 + 2 18g = -126 g = -126/18 g = -7 41. (3/5)k - 1/3 = -1 (3/5)k...
*Sunday, December 14, 2014 at 9:28pm*

**math**

Classic Furniture purchases dining room sets with an invoice date of September 27, and terms of sale of 3/10, n/60. What is the net date? A) October 17 B) October 22 C) November 2 D) November 26
*Sunday, December 14, 2014 at 9:10pm*

**Math**

1) A car is traveling at a rate of 70 miles per hour. what is this speed in feet per minute. 2) Nina can braid 28 inches of rope in 1 hour. What is her speed in feet per hour? I am studying but I don't understand these questions. I have test tomorrow. Thank you.
*Sunday, December 14, 2014 at 9:06pm*

**Math**

36 / 2^5/8 + 7 * (3+11) = 107 Did I do this problem right?
*Sunday, December 14, 2014 at 8:55pm*

**Sixth Grade Math**

A teacher tells 6 students the title of the next school play. Those 6 students each tell the title to 6 students. Then those additional students each tell the title to 6 students. How many students have been told the title of the next play? Answer: 6^3 = 216 Is my answer correct?
*Sunday, December 14, 2014 at 8:50pm*

**Business Math**

What is the rate if the interest is $1,200, the time is 3 years and the principle is $5,000?
*Sunday, December 14, 2014 at 8:50pm*

**Any Math Tutor Online? Help**

man on 12m tower, he observed two houses. the angle of depression to one of them was 6' and the other is 3'. how far apart the houses are. Calculate the distance between the house if: a)the houses are on the same side of the tower b)the houses are on opposite sides of ...
*Sunday, December 14, 2014 at 8:34pm*

**math plz help**

man on 12m tower, he observed two houses. the angle of depression to one of them was 6' and the other is 3'. how far apart the houses are. Calculate the distance between the house if: a)the houses are on the same side of the tower b)the houses are on opposite sides of ...
*Sunday, December 14, 2014 at 8:16pm*

**Math**

What are some situations in which estimation is useful in real life?
*Sunday, December 14, 2014 at 8:08pm*

**Math **

Penn writes a 2013-term arithmetic sequence of positive integers, and Teller writes a different 2013-term arithmetic sequence of integers. Teller's first term is the negative of Penn's first term. Each then finds the sum of terms in his sequence. If their sums are ...
*Sunday, December 14, 2014 at 8:04pm*

**Math **

Laverne starts counting out loud by 5's. She starts with 7. As Laverne counts, Shirley sums the numbers Laverne says. When the sum finally exceeds 5000, Shirley runs screaming from the room. What number did Laverne last say before Shirley flees?
*Sunday, December 14, 2014 at 8:02pm*

**Math **

Problem 6: Let a1,a2,.........a10 be an arithmetic sequence. If a1+a3+a5+a7+a9=17 and a2+a4+a6+a8+a10=15, then find a1.
*Sunday, December 14, 2014 at 8:00pm*

**math**

what is the standard deviation for a sample of 2 month old babies height: 15,17,20,16,23,16,19
*Sunday, December 14, 2014 at 7:58pm*

**sixth grade math**

what are the prime factorization of 88? I need help!
*Sunday, December 14, 2014 at 7:56pm*

**math**

They are planning to sell 75 year anniversary logo football to help raise money. an original full size logo football will sell for $22 and a miniature logo football will sell for $6. if they sell all 6000 footballs they ordered they can make $76000. Question - how many of each...
*Sunday, December 14, 2014 at 7:38pm*

**7th grade math**

Can you check these? 3. Simplify (56/8+3)*2-1 Ans = (7+3)*2-1 = 10*2-1 = 20-1 = 19 9. A spool of lanyard is 21 yards long. If it is cut into pieces that are each 1.75 yards long, how many pieces of lanyard will there be? Ans:21/1.75 = 12 pieces 12. (3/5)x - 10 = 1/6 Ans: (3/5)...
*Sunday, December 14, 2014 at 7:35pm*

**Math**

Expand and simplify: (9z2 - 2z + 10)(3z + 12)? I got 27x^3+102z^2+24z+120 correct me if i'm wrong pls? ty
*Sunday, December 14, 2014 at 6:16pm*

**math**

in a resort town, the number of people employed during any given month, f(x) in thousands, can be modeled by function f(x) = 2.3 sin 30 (x+1) + 5.5, where x represents the month, with january =1 and february =2 and so one
*Sunday, December 14, 2014 at 5:58pm*

**math**

Renting a Car A rental car costs $25 plus $0.25 per mile. (a) Write an equation that gives the cost C of driving the car x miles. (b)When will the rental be $100 dollars? Complete numerically with a table of values.
*Sunday, December 14, 2014 at 5:51pm*

**math**

Four friends at a party popped 3/4 of a bag of popcorn. They ate half of what was popped. What fraction of the popcorn in the bag did they eat?
*Sunday, December 14, 2014 at 5:17pm*

**Math**

Juan has DVDs 9/16 inches wide. How many DVDs wil fit on one shelf that's 1 3/4 wide
*Sunday, December 14, 2014 at 5:08pm*

**Math**

Wooden blocks are stacked to form a cube 3 block wide, 3 block long, and 3 block high. How many blocks are used? 27 blocks are used
*Sunday, December 14, 2014 at 3:57pm*

**math**

If x and y satisfy x^2+y^2=7, find the maximum value of x^2+2y^2+2x-4
*Sunday, December 14, 2014 at 3:42pm*

**math**

Last year,a total of 498 people attended an annual free concert outside city hall. This year,572 people attended the concert. To the nearest tenth, what is the percent increase in attendance from last year to this year?
*Sunday, December 14, 2014 at 3:26pm*

**Math**

What are the prime factorization of 88? 1,2,4,8,11 Am I correct?
*Sunday, December 14, 2014 at 3:24pm*

**Sixth Grade Math**

Three different rectangles have an are of 28 square units. What are the possible whole-number dimensions of the rectangles? Can someone please help me how to solve this problem?
*Sunday, December 14, 2014 at 3:08pm*

**Math**

A teacher tells 6 students the title of the next school play. Those 6 students each tell the title to 6 students. Then those additional students each tell the title to 6 students. How many students have been told the title of the next play? Answer: 6^3 = 216
*Sunday, December 14, 2014 at 3:05pm*

**Math**

A website developer is designing a website for a clothing company. Clothing items will be arranged on a web page in a rectangular display showing 32 clothing items, with the same number of items in each row. How many ways can the display be arranged? Answer: 8 ways
*Sunday, December 14, 2014 at 2:28pm*

**math**

Karen and Alicia sell TVs. Last month Alicia sold 15 less TVs than Karen. Together they sold 99. How many TVs did Karen sell?
*Sunday, December 14, 2014 at 2:25pm*

**math**

how do you convert centimeter into meteres
*Sunday, December 14, 2014 at 1:40pm*

**math**

Sheldon needs to buy 8 gallons of ice cream. Cold Farms price small size $2.50 for 1 pint large size $4.50 for 1 quart Cone Dreams price of small size $4.25 large size $9.50 for 1 gallon Which size container of Cold Farm ice cream is the better deal? Explain Which size and ...
*Sunday, December 14, 2014 at 1:35pm*

**Sixth Grade Math**

Complete the following statement. As the value of n in the expression (1/4)^n increases, the value of the expression is? I need help with this question.
*Sunday, December 14, 2014 at 1:33pm*

**Sixth Grade Math**

To find the surface area of a box, add the areas of the faces: 2(lw) + 2(lh) +2(wh). What is the surface area of the box below? H=8m W=5m L =11m My answer is 366m.
*Sunday, December 14, 2014 at 1:30pm*

**MATH**

Suzanna needs a board that is at 3.5 meters long. is the board long enough Explain
*Sunday, December 14, 2014 at 1:27pm*

**math**

Suzanna does not have a ruler but she has a several books that is 17 centimeters tall. Suzanna lays the books end to end and finds tat the board is the same length as 21 books. How many centimeters long is the board
*Sunday, December 14, 2014 at 1:24pm*

**Math Question**

Given tan θ = -8/5 and sin θ < 0, find sin θ, cos θ, csc θ, sec θ, and cot θ.
*Sunday, December 14, 2014 at 11:20am*

**Math**

Convert 35 degress to radian measure. Convert 250 degress to radian measure.
*Sunday, December 14, 2014 at 11:20am*

**Math**

Keon has marbles, 10 red, 5 green and 8 blue. What part of the marbles is blue?
*Sunday, December 14, 2014 at 8:46am*

**math**

Suppose payments were made at the end of each quarter into an ordinary annuity earning interest at the rate of 9%/year compounded quarterly. If the future value of the annuity after 8 yr is $80,000, what was the size of each payment?
*Sunday, December 14, 2014 at 1:44am*

**Math**

Given: Segment AB is congruent to Segment DE Prove: Segment AD is congruent to BE Note: (for the illustration) C is the midpoint of Segment AE, B is the midpoint of Segment AC and D is the midpoint of Segment CE.
*Sunday, December 14, 2014 at 12:32am*

**Math**

The altitude of a plane as it begins to descend is shown by the linear equation a = 22,000 – 800m, where a is the plane’s altitude, in feet, and m is minutes. What is the plane’s altitude when m = 12? ft
*Saturday, December 13, 2014 at 7:43pm*

**Math**

(2x-1)(3x-7)(4x+3) =6x^2-14x-33x+7 =(6x^2-19x+7)(4x+3) =24x^3+18x^2-126x+28x+21 =24x^3+18x^2-88x+21 <-- my answer but the correct answer is 24x^3-50x^2-23x+21 please correct me? thank you!
*Saturday, December 13, 2014 at 7:01pm*

**Math **

A fence 12ft high runs parallel to a tall building at a distance of 2ft from the building. What is the length of the shortest ladder that will reach from the ground over the fence to the wall of the building?
*Saturday, December 13, 2014 at 6:44pm*

**Math**

complete the equation for the linear function whose graph contains the points (2,5) and (3,0) y - ____ = _____(x -2) *fill in the blank - not sure how to do this question cleaning company charges a fee of $65 in addition to $10.50 per hour of cleaning.. x = the number of hours...
*Saturday, December 13, 2014 at 6:25pm*

**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*

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