Friday

April 18, 2014

April 18, 2014

**Branches of Math**

**Recent Math Questions**

Post a New Question | Current Questions

**Math**

Hi steve, thank you for this, if you please can you give me an explanation :( im short with answers, and quite busy at work.
*Monday, March 24, 2014 at 5:28am*

**Math**

assuming no amputees, there are 12 too many legs to be all ducks. So, 6 of the animals had 2 extra legs each. 8 ducks and 6 cows or, more algebraically, if there are d ducks and c cows, d+c = 14 2d+4c = 40 now solve for d and c.
*Monday, March 24, 2014 at 5:06am*

**Math**

Mohammed had ducks and cows on his farm. These 14 animals had a total of 40 legs. How many each animals did Mohamed have?
*Monday, March 24, 2014 at 4:30am*

**Calculus**

Nevermind I didn't read the question correctly. I got it! Thank You!
*Monday, March 24, 2014 at 1:43am*

**math, economics**

Consider a market in which consumption of the good being traded generates a positive externality. There are 100 identical consumers, each with a utility function given by 1/2√q+m+√G, where G denotes the total level of consumption in the market. The good is sold by ...
*Monday, March 24, 2014 at 12:55am*

**economics, math **

Could you please help me with this problem: Consider an oligopolistic market with two firms. Each of them produces using a cost function given by c(q)=q2. The aggregate demand in the market is given by 1000−p. Suppose that, in order to increase production, the government...
*Monday, March 24, 2014 at 12:50am*

**Calculus**

after this, i am to solve the differential but I am confused as to what I would make T air. dT/dt=-k(45-Tair) what do i do with the other 2 variables since k is a constant of proportionality. and T air is a constant
*Monday, March 24, 2014 at 12:49am*

**Gr 10 math - finding slopes in shapes**

Thank you, Steve.
*Monday, March 24, 2014 at 12:26am*

**Math**

dunno. Is 6^2 - 4(-7)(3) positive? The discriminant will always tell you.
*Sunday, March 23, 2014 at 11:43pm*

**Gr 10 math - finding slopes in shapes**

correct. -3/-4 = (-1)(3) / (-1)(4) = 3/4 The -1's cancel out
*Sunday, March 23, 2014 at 11:42pm*

**math**

thank you
*Sunday, March 23, 2014 at 11:19pm*

**math**

No solution
*Sunday, March 23, 2014 at 11:18pm*

**math**

3x-y=-2 3x-y=4 Please help me solve
*Sunday, March 23, 2014 at 11:08pm*

**math**

17cm
*Sunday, March 23, 2014 at 10:29pm*

**math**

If -2y = 1, then y = -1/2 Thus 3x + (-1/2) = 1, then: 3x = 3/2 x = 1/2
*Sunday, March 23, 2014 at 10:22pm*

**math**

Solve by elimination 5x+y=2 3x+y=1 This is what I got : 3(5x+y=2) -5(3x+y=1) 15x+3y=6 -15x-5y=-5 -2y=1 2 2 Y=1/2 15x+3(1/2)=6 15x+3/2 =6 15x/15= 9/2 /15 X=3/10
*Sunday, March 23, 2014 at 9:50pm*

**Math**

a = 90 - b 2b + a = 96 2b + (90-b) = 96 b = 6
*Sunday, March 23, 2014 at 9:49pm*

**Math**

2 cups = 16 fluid ounces 1 gallon = 128 fluid ounces 1 pint = 16 fluid ounces x/16 = 16/128 Solve for x.
*Sunday, March 23, 2014 at 9:44pm*

**math**

Please help me solve by elimination . 5x=20+y 16=3y+4x
*Sunday, March 23, 2014 at 9:43pm*

**Math**

1 gallon = 16 cups The directions make 18 cups. 1 pint = 2 cups Solve this proportion. 2/18 = x/2 18x = 4 x = 0.222 cups of concentrate
*Sunday, March 23, 2014 at 9:42pm*

**math**

thank you
*Sunday, March 23, 2014 at 9:38pm*

**math**

how far from an 84 foot burning building should the base of the fire truck ladder be placed to reach the top of the building at an angle of 60 degrees with the ground. the ladder is mounted to the truck 8 ft off the ground
*Sunday, March 23, 2014 at 9:37pm*

**Math**

the directions for lemonade say to put 2 cups of liquid concentrate into one gallon of water. if olivia only wants to make one pint of lemonade, how many fluid ounces of concentrate should she put?
*Sunday, March 23, 2014 at 9:32pm*

**math**

a team won 13 games lost 5 games and tied 2 games what percent of the games did the team win
*Sunday, March 23, 2014 at 9:32pm*

**math**

A team won 13 games and lost 5 games what of the games did the team win
*Sunday, March 23, 2014 at 9:29pm*

**Math**

Does -7x^2+6x+3 have two real-number solutions?
*Sunday, March 23, 2014 at 9:06pm*

**math**

3t = 3 * 30 = 90 3 * 90 = 180
*Sunday, March 23, 2014 at 8:55pm*

**math**

Justin takes three times as long to do a job as Carl does, suppose t represents the time it takes Carl to do the job. Then 3t represents the time it takes Justin. How long does it take Justin if Carl takes (a) 30 sec? (b) 90 sec? (c) 2 min?
*Sunday, March 23, 2014 at 8:40pm*

**Gr 10 math - finding slopes in shapes**

Is the slope 3/4 the same as -3/-4? In other words, do the negatives cancel each other out and become a positive number? Thanks!
*Sunday, March 23, 2014 at 8:38pm*

**math**

man, ya gotta check your answer. It does not fit the first equation. y = x-3, so x + 3(x-3) = 6 4x = 15 x = 15/4 y = 3/4
*Sunday, March 23, 2014 at 8:14pm*

**Algebra**

Solve? You mean the zeroes? y=0=-0.04x^2 + 1.3x + 56 x=(1.3 +-sqrt(1.3^2+3*.04*56)/(.08) do the math.
*Sunday, March 23, 2014 at 8:13pm*

**Math**

If you rearrange things a bit, you get x - 6y = 2 3x - 18y = 4 which is the same as x - 6y = 2 x - 6y = 4/3 The lines are parallel, so there is no intersection, and no solution to the equations. Your answer fits the 2nd equation, but not the first.
*Sunday, March 23, 2014 at 8:11pm*

**math word problems**

a = b/2 b = 4c a+c = 648 so, b/2 + b/4 = 648 3/4 b = 648 b = 648 * 4/3 = 864
*Sunday, March 23, 2014 at 8:06pm*

**math**

Solve by substitution: x-y=3 x+3y=6 This is what I get: X+3y=6 Y=x-3 X(x-3)=6 2x= 9 2 2 X= 9/2 9/2+3y=6 9/2-9/2+3y= 6-9/2 3y/3= 3/2/3 Y= ½
*Sunday, March 23, 2014 at 8:06pm*

**Math**

How do you solve this by substitution? x=6y+2 3x-18y=4 This is the answer I get: 3(6y+2)-18y=4 18y+6-18y=4 18y+1818y+6-18y+18y=4 36y=10 36 36 Y=5/18 3x-18(5/18) =4 3x-5+5= 4+5 3x= 9 3 3 X=3 (3, 5/18)
*Sunday, March 23, 2014 at 8:02pm*

**Math**

2x + (90-x) = 96
*Sunday, March 23, 2014 at 8:00pm*

**Math -Quadratics Help!**

#1 I assume you can find the intersection of two lines. In this case, that is at (1,1/4). The line 5x+7y+3=0 has slope -5/7, so now we have a point and a slope, and the desired solution is y - 1/4 = -5/7 (x-1) #2 y=3x-5 has slope 3, so the angle it makes with the x-axis is ...
*Sunday, March 23, 2014 at 8:00pm*

**Math**

Two angles are complementary. Twice one angle plus the other is 96. Find the measure of each angle.
*Sunday, March 23, 2014 at 7:50pm*

**Math**

3,500
*Sunday, March 23, 2014 at 7:20pm*

**Math**

Vo = 200 Ft/s = Initial velocity. g = 2*(-16) = -32 Ft/s^2. hmax = (V^2-Vo^2)/2g = (0-(200)^2)/-64 = 625 Ft. Yes, because his max. ht. is greater than the ht. of the building.
*Sunday, March 23, 2014 at 7:06pm*

**3rd grade math**

347
*Sunday, March 23, 2014 at 6:58pm*

**Math**

P = 2L + 2W 46 = 2(W + 9) + 2W 46 = 4W + 18 28 = 4W 7 = W
*Sunday, March 23, 2014 at 6:18pm*

**Calculus**

Suppose you have a hot cup of coffee in a room where the temp is 45 Celcius. Let y(t) represent the temp. of coffee as a function of the number of minutes t that have passed since the coffee was poured a) write a differential equation that applies to newtons law of cooling. ...
*Sunday, March 23, 2014 at 6:16pm*

**Math -Quadratics Help!**

I have a test tomorrow with a few sample questions that are expected to be on the test that I do not know how to properly do. 1)Find the slope intercept equation of the line passing through the intersection of the lines 2x-4y=1 & 3x+4y=4 and parallel to the line 5x+7y+3=0 2)...
*Sunday, March 23, 2014 at 6:15pm*

**Math**

The perimeter of a rectangle is 46 cm. One side is 9 cm longer than the other side. Find the lengths of the sides.
*Sunday, March 23, 2014 at 6:14pm*

**Math - Quadratics & Analytical Geometry**

I have a test tomorrow with a few sample questions that are expected to be on the test that I do not know how to properly do. 1)Find the slope intercept equation of the line passing through the intersection of the lines 2x-4y=1 & 3x+4y=4 and parallel to the line 5x+7y+3=0 2)...
*Sunday, March 23, 2014 at 6:13pm*

**Math**

two angles are complementary. Twice one angle plus the other is 96'. Find the measure of each angle.
*Sunday, March 23, 2014 at 6:13pm*

**math word problems**

Package A weighs half as much as Package B. Package B weighs four times as much as Package C. The total weight of Package A and Package C is 648 grams. Find the weight of Package B.
*Sunday, March 23, 2014 at 5:47pm*

**math**

You forgot the decimal point. 0.85 * 2.99 = $2.54 Doesn't that make more sense than over $200 for a bottle of soda? Subtract the cost of the soda from $10.00 to find the amount of change.
*Sunday, March 23, 2014 at 5:34pm*

**math**

I am sorry because I am really bad at math!! But after multiplying, I got 254.15, then I subtracted that by 10.00 and I got 244.15 now? Can you please explain to me what I have done wrong? :(
*Sunday, March 23, 2014 at 5:20pm*

**math**

Hmmm! What a store! It gives you more change than you paid. Please try again -- remembering that the change you receive must be less than $10.00
*Sunday, March 23, 2014 at 5:16pm*

**math**

I got $15.41?
*Sunday, March 23, 2014 at 5:04pm*

**probability math question**

10 marbles 8 not blue what do you think?
*Sunday, March 23, 2014 at 4:59pm*

**probability math question**

a bag contanins 7 red marbles, 2 blue marbles, and 1 green marble. What is the probabilty of choosing a marble that is not blue?
*Sunday, March 23, 2014 at 4:55pm*

**math**

C = pi*2r = (22/7) * 2(7n-21) C = (44/7) * (7n-21) = (308n - 924)/7 = 44n - 132
*Sunday, March 23, 2014 at 4:41pm*

**math**

10.00 - (0.85 * 2.99) = ?
*Sunday, March 23, 2014 at 4:40pm*

**math**

Anthony went to the store to buy soda. There was a sign that said, "15% off." The soda eas priced at $2.99 How much did the soda cost Anthony? If Anthony paid with a ten dollar bill, how much change did he recieve?
*Sunday, March 23, 2014 at 4:33pm*

**math**

minimize 2(xy + xy/4 + y^2/4) subject to xy(y/4) >= 231 x=5.29 y=13.22 h=3.30
*Sunday, March 23, 2014 at 4:26pm*

**math**

A company is selling 1 gallon blocks of orange juice. your task is to design a rectangle box ( prism) that meet all the criteria below: a) contains at least 231 cubic inches. b)the height of the box must be exactly 1/4th of the width of the box. c)the box is closed on all 6 ...
*Sunday, March 23, 2014 at 4:03pm*

**math**

0.6/24 = 2/x 0.6x = 48 x = 80 minutes
*Sunday, March 23, 2014 at 3:48pm*

**math**

maren walks 3/5 miles in24 minutes at a steady pace. how long does it take her to walk 2 miles
*Sunday, March 23, 2014 at 3:38pm*

**math**

Right.
*Sunday, March 23, 2014 at 3:21pm*

**math **

Round 75.36 to the nearest unit I think the answer is 75
*Sunday, March 23, 2014 at 3:15pm*

**MATH HELP!!**

from the 2nd: 2c + 6d = -34 c + 3d = -17 c = -3d-17 plug into the 1st: 3(-3d-17) - 7d = -3 -9d - 51 - 7d = -3 -16d = 48 d = -3 then c = -3(-3) - 17 = -8 c = -8 , d = -3
*Sunday, March 23, 2014 at 2:42pm*

**math word problems**

It lost the 2' plus another 4' (1 yd 1 ft). 2' + 4' =?
*Sunday, March 23, 2014 at 2:31pm*

**Math**

1/3 = 10/30 1/5 = 6/30 1/6 = 5/30 10/30 + 6/30 + 5/30 = 21/30 = 7/10
*Sunday, March 23, 2014 at 2:28pm*

**Math **

If 1/3 of. My salary is in one bank, 1/5 in another and 1/6 in another how much I have left
*Sunday, March 23, 2014 at 2:24pm*

**math word problems**

A black pole 3 yd 2 ft long was 2 ft longer than a white pole. When part of the black pole was cut away, it was 1 yd 1 ft shorter than the white pole. How much of the white pole was cut away?
*Sunday, March 23, 2014 at 2:08pm*

**MATH HELP!!**

3c-7d=-3 2c+6d=-34
*Sunday, March 23, 2014 at 1:49pm*

**math**

14%
*Sunday, March 23, 2014 at 1:44pm*

**Math**

How do you get 3.75 m from 3.8 m
*Sunday, March 23, 2014 at 1:18pm*

**Math**

29
*Sunday, March 23, 2014 at 1:05pm*

**Math**

Bella keeps a supply of red, blue, and black pens in a drawer. The drawer has 14 red pens, 18 blue pens, and 10 black pens. If Bella wants a red pen, what is the minimum number of pens she has to pull out from the drawer to make sure she gets a red pen?
*Sunday, March 23, 2014 at 12:20pm*

**math**

x^(5/2)
*Sunday, March 23, 2014 at 11:36am*

**math**

x^2 sqrt(x)
*Sunday, March 23, 2014 at 10:53am*

**math**

If a new home can be constructed for $160,000, what is the opportunity cost of federal defense spending, measured in terms of private housing? (Assume a defense budget of $700 billion.)
*Sunday, March 23, 2014 at 10:46am*

**Math**

Just noticed that Steve answered the same question when you reposted it just a few entries above this Please avoid reposting the same question, especially when it still shows near the top of the list of questions like it did here. It avoids unnecessary duplication of solutions.
*Sunday, March 23, 2014 at 8:54am*

**Math**

vector ab = (-3,4,1) vector dc = (3, -4, -1) = vector cd since their magnitude is the same, and they simply have opposite direction they must be equal and parallel So the figure is a parallogram vector cb = (0,-2,6) area = cross product of ab and cb = (-3,4,1) x (0,-2,6) = (26...
*Sunday, March 23, 2014 at 8:51am*

**College Math**

thanks steve. u really help me out.. really appreciate it .. =)
*Sunday, March 23, 2014 at 7:01am*

**math**

just substitute and evaluate g(x) = x^2-x, so g(g) = g^2-g = (x^2-x)^2 - (x^2-x) g(f) = f^2-f = (2x-1)^2 - (2x-1) f(x) = 2x-1, so f(g) = 2g-1 = 2(x^2-x)-1 f(f) = 2f-1 = 2(2x-1)-1 expand those out if you desire.
*Sunday, March 23, 2014 at 6:28am*

**College Math**

AB has direction (-3,4,1) BC has direction (0,-2,6) CD has direction (3,-4,-1) DA has direction (0,-2,6) So, AB || CD and BC || AD since the sides are parallel in pairs, they must have the same lengths in pairs (I trust you can verify this). the area is just |(b-a)x(d-a)| ...
*Sunday, March 23, 2014 at 6:26am*

**College Math**

show that the quadrilateral with vertices at the following points is a parallelogram and find its area. a = (5,2,0), b = (2,6,1), c = (2,4,7), d = (5,0,6)
*Sunday, March 23, 2014 at 1:33am*

**Math**

show that the quadrilateral with vertices at the following points is a parallelogram and find its area. a = (5,2,0), b = (2,6,1), c = (2,4,7), d = (5,0,6)
*Sunday, March 23, 2014 at 1:26am*

**math**

If f(x)=2x-1 and g(x)=x^2-x find : 1. g(g(x)) 2. g(f(x)) 3. f(g(x)) 4. f(f(x))
*Sunday, March 23, 2014 at 12:28am*

**math**

if f(x)=1-3x and g(x)=x^2-1, find : f(g(x))
*Saturday, March 22, 2014 at 11:53pm*

**math**

what's the trouble? Just substitute and evaluate: g(x) = x^2-1, so g(g) = g^2-1 = (x^2-1)^2-1 g(f) = f^2-1 = (1-3x)^2-1
*Saturday, March 22, 2014 at 11:22pm*

**math**

if f(x)=1-3x and g(x)=x^2-1, find : g(g(x)), and g(f(x))
*Saturday, March 22, 2014 at 11:19pm*

**Math**

loan at 2.8% --- $ x loan at 4.5 % ---- $ 31000-x solve for x .... .028x + .045(31000-x = 1024.40 times 1000 28x + 45(31000-x) = 1024400 etc
*Saturday, March 22, 2014 at 10:54pm*

**Math**

multipy the top equation by 8, the second equation by 7 -56x+72y=-29*8 56x+35y=-28*7 add the two equaitons 105y= sum above right side, then solve for y.
*Saturday, March 22, 2014 at 10:41pm*

**Math Help**

1. x^2 - 10x + 25 = 0 25 = -5 * -5 (x-5)(x-5) = 0 x-5 = 0 X = 5 x-5 = 0 X = 5 Solution set: X = 5, and 5. 2. 2x^2 + 9x -5 = 0 A*C = 2 * -5 = -10 = -1*10 2x^2 + (-x+10x) - 5 = 0 (2x^2-x) + (10x-5) = 0 x(2x-1) + 5(2x-1) = 0 (2x-1)(x+5) = 0 2x-1 = 0 2x = 1 X = 1/2 x+5 = 0 X = -5 ...
*Saturday, March 22, 2014 at 10:41pm*

**Math**

-7x + 9y = -29 8x + 5y = -28
*Saturday, March 22, 2014 at 9:59pm*

**Quick math help**

1. (3p^5*5p^2) + (7p^3*2p^4) = 15p^7 + 14p^7 = 29p^7 2. (6x^2-2xy+3y^2)-(4x^2-xy-y^2) = 6x^2-2xy+3y^2 -4x^2+xy+y^2 = 2x^2 - xy + 4y^2
*Saturday, March 22, 2014 at 9:26pm*

**Math **

solving applied problems two equations (Coles two student loans totaled $31,000. One of his loans was at 2.8% simple interest and the other at 4.5%. After one year, Cole owed $1024.40 in interest. What was the amount of each loan?)
*Saturday, March 22, 2014 at 8:45pm*

**Math**

Thanks Steve, but can anyone else help? Start with the word dinner change one letter at a time to form new until you have the word coffee Thank soooooooo much to everybody.
*Saturday, March 22, 2014 at 8:06pm*

**Math**

Thank you Steve, but I don't have a clue!
*Saturday, March 22, 2014 at 8:02pm*

**Math**

equate the y's to eliminate them: -x+3 = x^2+1 x^2+x-2 = 0 (x+2)(x-1) = 0 ...
*Saturday, March 22, 2014 at 7:45pm*

**Math**

DINNER SINNER SINTER SIFTER SOFTER ... COFFER COFFEE I guess not. Maybe you can come up with something better, but that's the method.
*Saturday, March 22, 2014 at 7:44pm*

**Math**

Doublets? Change one word to another word one letter at a time. Create linking words. DINNER serve COFFEE. Has anybody got a clue how to do this? You have to end with the word coffee? Any help would me much appreciated. Thank You
*Saturday, March 22, 2014 at 7:35pm*

**Math**

Solve the system using elimination. y = -x + 3 y = x^2 + 1
*Saturday, March 22, 2014 at 6:19pm*

**math**

75 is 25% off from 100 75 is 12% off from 85 It is unclear just what you have in mind.
*Saturday, March 22, 2014 at 3:07pm*

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