Tuesday

January 27, 2015

January 27, 2015

**Branches of Math**

**Recent Math Questions**

Post a New Question | Current Questions

**Math**

An orchestra buys music stands for $42 each with $298 in its bank account. Write a function rule that shows how the account balance depends on the number of stands bought. What are the initial value and rate of change of the function?
*Sunday, January 4, 2015 at 1:18pm*

**math**

The weekly marginal cost functions C'(x) and the weekly marginal revenue function R'(x) of a company assembling personal computers are given by C'(x) =RM(3x^2-118x+1315) and R'(x)=RM(1000-4x), where x is the number of computers assembled per week. If the fixed ...
*Sunday, January 4, 2015 at 12:25pm*

**Math**

Kevin had 3/4 yd of string. He used 1/3 of it on a school project. How much string did he use? A.5/12 yd B.1/3 yd C.7/12 yd D.1/4 yd (numbers are all fractions)
*Sunday, January 4, 2015 at 11:59am*

**math**

the ninth term of an arithmetic progression is 52ind the and the sum of the first twelve terms is 414.find the first term and the common difference.
*Sunday, January 4, 2015 at 10:44am*

**math**

Draw a number line counting by 10s for 240
*Sunday, January 4, 2015 at 7:00am*

**math**

Mabel is installing a square pool in her backyard and wants a circular fence to enclose the pool to create 4 grassy areas around the pool as show in the figure. If the pool is located at the coordinates (1, 5), (5, 8), (4, 1), and (8, 4), what is the amount of fencing Mabel ...
*Sunday, January 4, 2015 at 6:33am*

**Math**

John was visiting three cities that lie on a coordinate grid at (-4, 5), (4, 5), and (-3, -4). If he visited all the cities and ended up where he started, what is the distance he traveled? Round your answer to the nearest tenth. (like 3.2 or 5.7)
*Sunday, January 4, 2015 at 6:31am*

**Math**

tom is eight years older than steve. three years ago, steve was two years more than one third as old as tom was then. how old is tom now? answer pls
*Sunday, January 4, 2015 at 4:00am*

**math**

a 2 digit number is 9 times the sum of its digits .if it's ones and tens digits be x and y.write a linear equation in two variable
*Sunday, January 4, 2015 at 2:47am*

**math**

Given that <1 and <2 are supplementary angles and that m<1=115 degrees , explain how to find the measure of the complement of <2
*Sunday, January 4, 2015 at 12:00am*

**Math**

Brenda is building a rectangular pen for her dog. She has enough fencing to build the pen so that it has a perimeter of 36 feet. She wants the pen to have an area of 65 ft2. What are the dimensions of the dog pen? A. 5 feet by 13 feet B. 10 feet by 8 feet C. 9 feet by 9 feet D...
*Saturday, January 3, 2015 at 11:56pm*

**math**

At noon the temperature was 2°f.By sunset it had dropped 6 degrees. WHAT WAS THE TEMPERATURE AT SUNSET?
*Saturday, January 3, 2015 at 10:17pm*

**math/compound **

Calculate the interest earned on an investment of 2500 invested at an interest rate of 6.15%/a compounded quarterly for 10 years.
*Saturday, January 3, 2015 at 7:35pm*

**Physics, Math, Aerospace, Engineering**

A de-orbit burn, similar (but not the same) to that presented in the previous math problem, has been performed. During this de-orbit burn a pre-calculated ∆V (delta V, change in velocity) of 99.1 meters per second will be used to decrease the Shuttle’s altitude from...
*Saturday, January 3, 2015 at 7:22pm*

**math**

Martha wrote the following inequality statement about the temperatures: -4.3<-2.91<5.7
*Saturday, January 3, 2015 at 3:04pm*

**math**

solve the system algebraically and graphically 32x^2+9y^2=324 3y^2-x^2=3
*Saturday, January 3, 2015 at 2:15pm*

**Math**

(Find the slope and y intercept of the graph of each equation) 2y + 4n = -6x Please show steps. Thank you!
*Saturday, January 3, 2015 at 12:31pm*

**Math - Please help**

(Write an equation in slope intercept form of the line that passes through the given point and is parallel to the graph of the equation.) (1, -3); y + 2 = 4(x – 1) Please show steps
*Saturday, January 3, 2015 at 11:22am*

**math**

Types of triangles?
*Saturday, January 3, 2015 at 10:31am*

**Math Linear Equations**

Two lines are drawn on a co-ordinate axis. The equation of the first line is y=-2,and the equation of the other line is y=3x+1. What are the co-ordinates of their intersection point? I have been on this for hours and can't figure out how to do this. Please help. Thank you
*Friday, January 2, 2015 at 11:53pm*

**Math-Linear Equations**

True or false? A line perpendicular to a line whose slope is -0.75 has a slope of 1.3 repeating. Please help me with this.Thank you
*Friday, January 2, 2015 at 7:39pm*

**math**

Evan buys 2 CDs. $1.49 is added to the total price which is the 5% sales tax. What is the cost for each of the CDs?
*Friday, January 2, 2015 at 4:19pm*

**math-algebra HELP!!!!**

a scientist theorized that you can estimate the temperature by counting how often crickets chirp. the scientist gathers the data in the table shown. A)how many cricket chirps would you expect to indicate a temperature of 85 degrees? include a graph and an equation as part of ...
*Friday, January 2, 2015 at 4:01pm*

**algebra**

IREALY DON'T KNOW MY MATH THAT MUCH CAN YOU HELP.
*Friday, January 2, 2015 at 3:55pm*

**math**

Carla invests $3,000, at 8% interest, compounded quarterly for 1 year. Manually calculate the compound interest for this investment.
*Friday, January 2, 2015 at 2:02pm*

**Math**

(Write each equation in standard form using integers) y – 4 = -2(x – 3) Please show steps Thank you!
*Friday, January 2, 2015 at 12:18pm*

**Math**

A newly married couple expected a boy and a girl or four children, occuring boy or girl has equal probability. Find the probability of success of their expectations.
*Friday, January 2, 2015 at 11:29am*

**math lit, accounting, business studies, cat**

Can i study (b com)supply chain management in varsity. My main concern is math lit.
*Friday, January 2, 2015 at 6:20am*

**math fractions**

3/12+3/4x=
*Friday, January 2, 2015 at 3:36am*

**math**

the sum of two number is 39 . twice the first number plus 3 times the second numberis 101. find the numbers. x+x+1=39 2x=38 x=19 twice the first number 19 it would be 38 and 57 b three times the second number. i know is wrong kind o but please tell me.
*Friday, January 2, 2015 at 2:30am*

**Math**

Eighty metres of fencing are available to enclose a rectangular area. What are the dimensions that enclose the max area. What is max area?
*Friday, January 2, 2015 at 12:52am*

**math**

How many subset of 6 can I get from 18 elements
*Thursday, January 1, 2015 at 8:12pm*

**Math**

A tractor tire has a diameter of 6 feet and is revolving at a rate of 45 rpm. At t=0, a certain point is at height 0. Write an equation to describe the height of the point above the ground after t seconds. The answer is apparently d=-3cos(3pi/2)t +3 But I thought it's ...
*Thursday, January 1, 2015 at 4:16pm*

**Math**

A Ferris wheel makes 3 revolutions per minute. If the diameter is 20 feet, write an equation to describe the height off the ground of a particular seat after t seconds. I got d=10cos(6pi)t as the answer, is this correct?
*Thursday, January 1, 2015 at 4:06pm*

**ELEMEMTARY MATH**

WHAT iS THE SQUARE ROOT OF 12 MY ANSWER IS 2, AM I CORRECT?
*Thursday, January 1, 2015 at 3:18pm*

**math**

Janet invested $10,000, part at 2% and part at 12%. If the total interest at the end of the year is $600, how much did she invest at 2%?
*Thursday, January 1, 2015 at 1:49pm*

**Math**

Reiny ..thanks for the formula and example. I tried it and i get that both sets of triangles are congruent but it is multiple choice with one answer. I dont know what i am doing wrong. How do I determine which two triangles on a graph are congruent. ∆QRS and ∆DEF ...
*Thursday, January 1, 2015 at 12:58pm*

**Math**

(Find the slope and y intercept of the graph of each equation) 2y + 4n = -6x
*Thursday, January 1, 2015 at 12:18pm*

**math**

For the curve given by 4x^2+y^2=48+2xy, show that there is a point P with x-coordinate 2 at which the line tangent to the curve at P is horizontal.
*Wednesday, December 31, 2014 at 8:03pm*

**math**

For the curve given by 4x^2+y^2=48+2xy, find the positive y-coordinate given that the x-coordinate is 2.
*Wednesday, December 31, 2014 at 8:03pm*

**math**

Tyson handle 250 service calls on his shipped yesterday. Of those, 20% resulted in a successful upsell additional services. You're texting Nexus 6 dollar Commission on top of his regular salary for a successful up so that makes, how much commission did he make yesterday?
*Wednesday, December 31, 2014 at 2:17pm*

**Math- Max and Minimum**

Consider the function f(x) = 3/4x^4 –x^3 -3x^2 + 6x , find the relative extrema for f(x), be sure to label each as a maximum or minimum. How do I find the x-values of what it is asking?
*Wednesday, December 31, 2014 at 1:33pm*

**Math**

If 360 workers called in sick and 240 went to work, how many workers work at the company all together? Solve using fractions and multiplication or division. Obviously the answer is 600 but how do I solve the problem using multiplication or division?
*Wednesday, December 31, 2014 at 10:09am*

**MATH**

I entered the wrong coordinates in a previous question, i corrected down below. How do I determine which two triangles on a graph are congruent. ∆QRS and ∆DEF or ∆ABC and ∆XYZ. i found the coordinates of both sets: QRS Q(-2,5), R(-2,1), S(-5, 1) DEF D(5...
*Wednesday, December 31, 2014 at 9:33am*

**5th grade Math**

Please help, what operation should I use to solve this problem? Jessica bought 10.50 pounds of potatoes. The potatoes are sold in sacks of 20 if the potatoes cost $1.99 per pound. How much money did Jessica spend?
*Wednesday, December 31, 2014 at 7:51am*

**math**

For the curve given by 4x^2+y^2=48+2xy show that ((dy)/(dx))=(y-4x)/(y-x)
*Wednesday, December 31, 2014 at 3:11am*

**Math**

How do I determine which two triangles on a graph are congruent. ∆QRS and ∆DEF or ∆ABC and ∆XYZ. i found the coordinates of both sets: QRS Q(-2,5), R(-2,1), S(-5, 1) DEF D(5,-5), E(5,-2), F(2,-2) or ABC A(4,5), B(6,2), C(2,2) XYZ X(-4,-5), Y(-6,-2), Z(-...
*Tuesday, December 30, 2014 at 10:29pm*

**math**

The requirement for computer server capacity at Acme Industries is expected to increase at a rate of 15% per year for the next 5 years. If the server capacity is expected to be 1,400 gigabytes in 5 years, how many gigabytes of capacity are there today? Round to the nearest ...
*Tuesday, December 30, 2014 at 10:01pm*

**Math**

What operation should I use to solve this problem? Jessica bought 10.50 pounds of potatoes, The potatoes are sold in sacks of 20. If the potatoes cost $1.99 per pound how much money did Jessica spend
*Tuesday, December 30, 2014 at 8:59pm*

**Math**

A building was 210 ft high and a guy was 8 ft from the top and let down a wire that is .44 radians (degrees) to the ground... How long is the wire?
*Tuesday, December 30, 2014 at 4:35pm*

**Math/ Statistics**

The owner of a football team claims that the average attendance at home games is over 3000, and he is therefore justified in moving the team to a city with a larger stadium. Assuming that a hypothesis test of the claim has been conducted and that the conclusion is failure to ...
*Tuesday, December 30, 2014 at 12:17pm*

**Math/ Statistics**

A consumer advocacy group claims that the mean amount of juice in a 16 ounce bottled drink is not 16 ounces, as stated by the bottler. Determine the null and alternative hypotheses for the test described. A. H0: µ = 16 ounces Ha: µ < 16 ounces B. H0: µ &...
*Tuesday, December 30, 2014 at 12:09pm*

**Math/ Statistics**

z = 1.8 for Ha: µ > claimed value. What is the P-value for the test? A. 0.9641 B. 3.59 C. 96.41 D. 0.0359
*Tuesday, December 30, 2014 at 12:06pm*

**math**

How do I solve this? -5(4x+1) =15 Thank you
*Tuesday, December 30, 2014 at 10:47am*

**Math**

A savings account with a current balance of $5,000 earns 2.75% annual interest, compounded continuously. To the nearest dollar, what will be the account balance in 10 years?
*Tuesday, December 30, 2014 at 9:50am*

**Math**

∆ABChas vertices A(–1, –2), B(–4, –4), and C(–3, –5). Graph ∆ABC and its image after a reflection over the x-axis. Name the coordinates of the vertices of the reflected triangle...is it A(1,-2), B(3, -4), C(2,-5) or A(-1,2), B(-3,4), C...
*Monday, December 29, 2014 at 10:48pm*

**science**

Research suggests that American students lack a sufficient education in math and science to compete globally. How does the controversy about teaching evolution affect and reflect this problem?
*Monday, December 29, 2014 at 6:24pm*

**Math**

Which of the following ordered pairs is a solution to the inequality y less than or equal to -2x + 8? a. (0, -4)<<<< b. (5, -1) c. (7, 0) d. (9, 1)
*Monday, December 29, 2014 at 5:33pm*

**Math**

The twice–differentiable function f is defined for all real numbers and satisfies the following conditions: f(0)=3 f′(0)=5 f″(0)=7 a)The function g is given by g(x)=e^ax+f(x) for all real numbers, where a is a constant. Find g ′(0) and g ″(0) in ...
*Monday, December 29, 2014 at 2:53pm*

**math**

A board is 54 inches long. Mate cuts the board into 6 equal pieces. How long is each piece
*Monday, December 29, 2014 at 2:23pm*

**Math help, Please**

An inverted conical tank (with vertex down) is 14 feet across the top and 24 feet deep. If water is flowing in at a rate of 12 ft3/min, find the rate of change of the depth of the water when the water is 10 feet deep.
*Monday, December 29, 2014 at 2:10pm*

**Math**

The edge of a cube was found to have a length of 50 cm with a possible error in measurement of 0.1 cm. Based on the measurement, you determine that the volume is 125,000 cm3. Use tangent line approximation to estimate the percentage error in volume.
*Monday, December 29, 2014 at 1:36pm*

**math**

Describe a situation this week when you used math to solve a problem involving data, graphs and statistics.
*Monday, December 29, 2014 at 10:41am*

**Math**

Is rotating the point L(4,4) 90° ABOUT THE ORIGIN THE SAME AS REFLECTING THE POINT OVER THE X-AXIS? EXPLAIN. I get that the rule is counter clockwise and you rotate x and y and then change the value of the 1st sign.. becomes -y,x but i don't know how to answer the ...
*Sunday, December 28, 2014 at 11:34pm*

**Math**

Jill traveled to Canada and bought a new lamp for $460 Canadian dollars. In U.S. dollars (to the nearest cent) this is equivalent to
*Sunday, December 28, 2014 at 9:14pm*

**math**

Let x1,x2,x3 be random sample of f(x)=exp(-x),x>0,zero elsewhere,if y1=x1/x2,y2=x3/(x1+x2),y3=x1+x2 find g(y1,y2,y3),g(y1),g(y2,y3)
*Sunday, December 28, 2014 at 4:28pm*

**math**

a boy has 380 prize tickets he wants to exchange for action figures at a prize booth,the prize both tickets 5 tickets can be exchanged for a large figure and 7 tickets for 2 small figures the boy wants 4 times as many small action figures as large can the boy get 80 small ...
*Sunday, December 28, 2014 at 3:18pm*

**Math and Finance**

If May invests $5,000 compounded annually at 8%, how much money will she have at the end of 8 years?
*Sunday, December 28, 2014 at 3:10pm*

**math**

Let x1,x2,x3 be random sample of f(x)=2x,0<x<1,zero elsewhere find P(x1/x2<0.5)
*Sunday, December 28, 2014 at 1:01pm*

**Math**

find the distance between point A(5,3) and point B (1,0) on a graph using the Pythagorean Theorem.
*Sunday, December 28, 2014 at 12:57pm*

**math**

Let x1,x2,x3 be random sample of normal(6,4)(x+1)/2,-1<x<1,find P(max{x1,x2,x3}>8)
*Sunday, December 28, 2014 at 12:55pm*

**math**

Let x1,x2,x3 be random sample of normal(6,4), find P(max{x1,x2,x3}>8)
*Sunday, December 28, 2014 at 12:52pm*

**math**

Let x1,x2,x3 be random sample of normal(6,4), find P(max{x1,x2,x3}>8)
*Sunday, December 28, 2014 at 12:52pm*

**math**

Let x1,x2,x3,x4,x5 be random sample of f(x)=(x+1)/2,-1<x<1,zero elsewhere, find P(four of{x1,x2,x3,x4,x5}>0)
*Sunday, December 28, 2014 at 12:34pm*

**Math**

a line has a slope of 6 and a y-intercept of –10. which is the equation in slope intercept form
*Sunday, December 28, 2014 at 12:17pm*

**Math**

Solve the system of two equations 2y=8 and 15y=2x-4
*Sunday, December 28, 2014 at 12:12pm*

**math**

how the quadratic equation is useful in calculating the stopping distance when the breaks are applied to a vehicle?
*Sunday, December 28, 2014 at 9:26am*

**Math**

A uniform rod, AB 2 meters long has a mass of 10 kg and rests with its end A on a rough horizontal ground with coefficient of friction 0.6. The rod is is inclined at 30 degrees to the horizontal and is supported on a rough pin at point C, 1.5 meters from A with coefficient of ...
*Saturday, December 27, 2014 at 11:00pm*

**math**

i have 20.00 for my phone calls every time i call it takes 2.50 then 24 cents a minute how much would it cost to talk for 5 minutes?
*Saturday, December 27, 2014 at 9:30pm*

**Math**

A floating leaf bobs up and down a total of 8 cm. the leaf completes 3 complete cycles in 8 seconds. (Assume equilibrium at t=0.)Write an equation to model the simple harmonic motion. Can someone explain to me why the answer to this problem is d=4sin(3pi/4)t?
*Saturday, December 27, 2014 at 4:59pm*

**Math**

Will Rogers spun a lasso in a vertical cycle. The diameter of the loop was 6 feet, and the loop spun 50 times each minute. If the lowest point on the rope was 6 inches above the ground, write an equation to describe the height of this point above the ground after t seconds. ...
*Saturday, December 27, 2014 at 4:57pm*

**math**

If a plant grew 1 1/4 inches in one month. If the plant grows at the same rate, how many inches will it have grown at the end of 3 1/2 months?
*Saturday, December 27, 2014 at 3:48pm*

**Physics**

Station Math Two station astronauts will each perform two 8-hour EVAs within 13 days to repair a damaged solar panel that was impacted by a micrometeoroid on the space station. What is the total amount of oxygen needed by the two astronauts to accomplish this? Please put your ...
*Saturday, December 27, 2014 at 1:52am*

**math**

A music stores stock of music includes new releasesand top ten hots on the ratio of 3:5. How many top ten hits are tthere in a shipment of 80???? What I did 3:5 *16:*16 48:80 Is it right or not plz tell. I am having so much difficult I in this one
*Saturday, December 27, 2014 at 1:39am*

**Math**

You buy a television for $550. That price included a 10% sales tax. what is the price without sales tax? The answer choices are A)$500 B)$605 C)$55 D)$550 I did a proportion to find this answer by doing: 10/100=x/550 ;and I ended up getting $495, which is not one of the ...
*Friday, December 26, 2014 at 10:07pm*

**Math**

Write an equation with phase shift 0 to represent simple harmonic motion with initial position -1/2, amplitude 1/2, and period 4. I got d=(1/2) sin (pi/2) t + (1/2). Is this correct?
*Friday, December 26, 2014 at 7:16pm*

**Math**

An electrician charges a $50 fee to make a service call plus $25 per hour he works. Determine whether the relationship between the two variables is proportional. Hours Cost($) 1 75 2 100 3 125 4 150 Is this proportional? Because i am not sure. When i plot these points on a ...
*Friday, December 26, 2014 at 6:56pm*

**math**

A music stores stock of music includes new releases and top ten hits in the ratio of 3:5. How many top hits are there was n a shipment of 80. What I did,,................... 3:5 #16:*16 48:80
*Friday, December 26, 2014 at 5:47pm*

**math**

a muffin recipe calls for 4 cups of sugar and yields 36 muffins. if amelia only wants to make 24 muffins, how much sugar will she need?
*Friday, December 26, 2014 at 5:35pm*

**math**

the bookstore normally sells mechanical pencils for $6.50. this week the pencils are discounted by 25%. to the nearest cent, what is the amount of the discount?
*Friday, December 26, 2014 at 4:52pm*

**math **

suppose a 24 acre plot of land is being divided into 1/3 acre lots for a housing development project. what is the greatest number of lots possible in the development? so do you solve by dividing 24 and 1/3?
*Friday, December 26, 2014 at 4:38pm*

**math**

the area of an equilateral triangle is given by the expression s^2 x square root of 3/4, where s is the side length of the triangle. what is the area of the triangle? round to the nearest tenth the triangle is 5 cm on all three sides.
*Friday, December 26, 2014 at 4:22pm*

**math**

estimate 58% of 121 by using 10%. show your work. thanks so much
*Friday, December 26, 2014 at 4:20pm*

**math**

the french club is hosting a breakfast each monday morning in the cafeteria. The breakfast menu is shown in the table. crepes-2 dollars croissants-3 dollars danish- 5 dollars juice- 1 dollar write an algebraic expression that can be used to find a customer's total cost ...
*Friday, December 26, 2014 at 4:15pm*

**math**

overnight the low temperature dropped to -6 degrees Fahrenheit. If the high temperature during the day was 11 degrees Fahrenheit, what was the difference between the high and low temperatures? Please help, thank you so much!
*Friday, December 26, 2014 at 4:05pm*

**math**

the distance from the sun to earth is about 1.5x10^11 meters. suppose light travels at a speed of 3x10^8 meters per second. About how long does it take light from the sun to reach earth? PLEASE HELP!!!
*Friday, December 26, 2014 at 3:51pm*

**math**

It's been several years since I have had to do math and I am posed with this ? and don't recall how to find the answers. There is a fixed overhead of $1 per bolt. They make a run of 10,000 bolts at a total marginal cost of $70k. They sell them all, and lose $20k. What ...
*Friday, December 26, 2014 at 3:19pm*

**math**

A wire 360 cm long is cut into two pieces. One piece is formed into a square and the other into a circle. If the two figures have the same area, what are the lengths of the two pieces of wire (to the nearest tenth of an centimeter)? Take the length of the circle to be x cm.
*Friday, December 26, 2014 at 1:54pm*

**6th grade math**

S 4 cups of cereal. The box states that one serving of cereal is equal ti 4/5 cup. How many servings did Sandra eat? Please explain and show work!
*Friday, December 26, 2014 at 1:22pm*

**Math**

A bag contains 33 balls: 10 blue 11 red and 12 green If a person will select balls at random from the bag without replacement, what is the minimum number of balls needed to be selected in order to be sure that the balls selected include 3 balls of the same color
*Friday, December 26, 2014 at 3:58am*

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