Wednesday

January 28, 2015

January 28, 2015

Total # Posts: 4,204

**Physics**

A car of mass 900.0 kg accelerates away from an intersection on a horizontal road. When the car speed is 49.7 km/hr (13.8 m/s), the net power which the engine supplies is 4300.0 W (in addition to the extra power required to make up for air resistance and friction). Calculate ...
*January 2, 2014*

**math**

thank you starting to get it little by little
*December 18, 2013*

**math **

how would you do the following 12 divided by 2 7/8, 1 1/6 x 3 3/8 ,
*December 18, 2013*

**math **

How do you do the following 1 5/8 +2 7/24 and 1 3/8 divided by 2/4. NOT SURE OF THE FORMULA
*December 17, 2013*

**math**

Thank you. I thought so too
*December 16, 2013*

**math **

At the Pentagon there are921 feet along each outer side facade and 17.5 miles of corridorS inside it. All sides of the Pentagon are equal. What is the perimeter of the Pentagon
*December 16, 2013*

**math**

Is it 7.98 x2 x4.2 /1/2 =16.75?
*December 15, 2013*

**math**

The area of a triangle is 3.99cm2 . If the base is 4.2 cm, how do you find the height ?
*December 15, 2013*

**science very urgent help?**

Susan has heard that taking an over-the-counter ‘energy’ pill, which contains as much caffeine as a strong cup of coffee, makes people feel alert and ‘speedy’. She wonders if taking this pill will make a difference to the reaction times of people doing an ...
*December 13, 2013*

**math**

Tom has 58 cards
*December 12, 2013*

**math**

Tom and Max have 72 football cards.Tom has 2 more than 4 times as many cards as Max has. How many football cards does Tom have?
*December 12, 2013*

**Geography**

They sailed...(double post ;))
*December 11, 2013*

**Social Studies (History)**

Just google search it, @Nicole, it's not that hard honestly...
*December 11, 2013*

**math**

Yeah what Steve said
*December 11, 2013*

**math**

For the first one: if you have to, just list em all out Mugs: 6,12,18,24,30,36,42,48,54,60.... Shirts: 14,28,42,56,70.... See any numbers in common so far? Yep: the 42. So the 42nd guest will get both Second one: Can't figure it out, cuz not enough information, did you ...
*December 11, 2013*

**Math - Precalculus - Parametric Equations/Geometry**

Thanks, but I was wondering how you got the horizontal and vertical speeds, sorry I'm not that good at parametric equations yet :( Also how did you get that the angular velocity is 3*2pi / s? Thanks
*December 11, 2013*

**Math - Precalculus - Parametric Equations/Geometry**

A hockey puck of diameter 3 inches is spinning around its center at a speed of 3 counterclockwise rotations per second. The center of the puck is traveling at a speed of 24 inches per second at an angle of 45 degrees to the positive real axis. (a) At time t=0, the center of ...
*December 11, 2013*

**math**

If you buy one ticket you have a 1/2500 chance of winning. Thus, you're expected value is 5000/25$ = 2$ return for your 5$ ticket. So you get -$3.
*December 11, 2013*

**College Algebra**

C * x = C x = C/C C/C = 1 x = 1
*December 11, 2013*

**College Algebra**

slope = y2 - y1 / (x2-x1) = 7/5 perpendicular = -1/m so we have -5/7
*December 11, 2013*

**College Algebra**

Erm....? *I found them!* They're in the 3rd row before the = signs. Seriously though, I don't get what you're asking...
*December 11, 2013*

**math**

adult ticket = 3 * child ticket adult + child = 36 substitute in: 3 child ticket + child ticket = 36 4 child ticket = 36 child ticket = 9
*December 11, 2013*

**algebra**

ax^2 + bx + c = 1 plug in first value 4a -2b + c = 1 do the same for the others: 0 + 0 + c = 5 c = 5 16a + 4b + c = -59 so we plug in c into the equations with and b: 16a + 4b + 5 = -59 4a -2b + 5 = 1 4a = 2b -4 2a = b - 2 16a + 4b = -64 8(b-2) + 4b = -64 2(b-2) + b = -16 2b...
*December 11, 2013*

**Math, HELP!**

A concert venue sold 1425 tickets one evening. Tickets cost $40.00 for a covered pavilion seat and $30.00 for a lawn seat. Total receipts were $48,000.00. How many of each type of ticket were sold?
*December 10, 2013*

**math**

Thank you. I was going crazy trying to figure it out.Thank you for all your help in math
*December 10, 2013*

**math**

sorry i just dont get it.
*December 10, 2013*

**math**

Started with 125.87 -40 =85.87
*December 10, 2013*

**math**

IS IT 85.87 +40.00 =125.87 -22.25 =103.62 +22.25. so is it103.62?
*December 10, 2013*

**math **

This morning Tom deposited 22.25 in his bank account. At lunchtime he withdrew 40.00 and he found out that he had a balance of 85.87. What was his balance at the start of the day?
*December 10, 2013*

**math**

72 is what percent of 480? Write an equation.
*December 10, 2013*

**math**

15/23.25= x/100 then you cross multiply?
*December 10, 2013*

**math**

Estimate a 15% tip on a taxi ride that cost 23.25.
*December 10, 2013*

**math**

thank you!
*December 10, 2013*

**math**

36*108=3888 divided by 100=38.88?
*December 10, 2013*

**math**

108 is 36% of what number? Write and solve a proportion.
*December 10, 2013*

**math**

It is B.
*December 10, 2013*

**math**

What percent of 94 is 23? A.n/94=23/100 B.23/94=n/100 C.94/n=23/100 D.23/94=100/n
*December 10, 2013*

**math**

What number is 73% of 215? A.215=0.73n B.n=0.73*215 C.0.73=n*215 D.215=73n
*December 10, 2013*

**Algebra2**

srry :(
*December 10, 2013*

**Algebra2**

minus the first from the 3rd equation we get 3x-3x + 2y-2y + 3z -z = 7-1 2z = 6 z = 3 plug into the 2nd equation to get 5x+5y = 3-12 = -9 plug into the first equation to get 3x+2y = 4 Multiply the 2nd equation by 2 and the 1st by 5 10x+10y = -18 15x+10y = 20 minus first from ...
*December 10, 2013*

**Parametric equations/Trigonometry - Lattice points**

Thanks, but why is it a triangle and not a line I graphed it and it is a line do I have to connect the ends and stuff?
*December 10, 2013*

**Parametric equations/Trigonometry - Lattice points**

A lattice point is a point with integer coordinates. How many lattice points (x,y) with -100 less than or equal to x less than or equal to 100 and -100 less than or equal to y less than or equal to 100 are on the graph of the parametric equations x=30-40 cos t y=-50 + 30 cos t...
*December 10, 2013*

**Geometry**

volume = w * h * l surface area = 2wh + 2lh + 2wl So find something with dimensions that multiply up to the same number but the surface area is different, for example if w = 1 h = 2 l = 8 compared with w= 1 h = 4 l = 4 It would give different surface areas 4 + 32 + 16 8 + 8 + 32
*December 10, 2013*

**Trigonometry**

ww w . wolframalpha . c om
*December 10, 2013*

**Chemistry**

I have a similar question and I got 1.7x10^-8 but would we have to multiply this value by 2?
*December 9, 2013*

**English**

I suppose so, if she meant a journal entry, you should probably write it as a journal entry.
*December 9, 2013*

**science**

P = W(joules)/t(time in sec) 120J / 5 seconds = ?
*December 9, 2013*

**Language Arts**

? @ zamaya @ sandy, we were given no info, no story...
*December 9, 2013*

**Astronomy**

Erm...I don't think we're going to solve all these problems for you you need to at least make some effort
*December 9, 2013*

**Algebra 1b!**

what do yo think for each problem?
*December 9, 2013*

**Geometry**

2.5 * 4.6 * x = 172.5 x = 15 surface area = 2 * wh + 2*wl + 2*hl 2.5 * 4.6 * 2 + 2*2.5 * 15 + 2*4.6*15 =?
*December 9, 2013*

**Math**

Erm...no....it can't.
*December 9, 2013*

**math**

0.205 * 7700 = ?
*December 9, 2013*

**Math-Precalculus-Parametric Equations - Ellipses**

Thank you very much both of you sirs it is much appreciated!
*December 9, 2013*

**Math-Precalculus-Parametric Equations - Ellipses**

The graph of the equation (x-h)^2/(a^2) + (y-k)^2/b^2 = 1 is an ellipse with center (h,k), horizontal axis length 2a, and vertical axis length 2b. Find parametric equations whose graph is an ellipse with center (h,k), horizontal axis length 2a, and vertical axis length 2b, and...
*December 9, 2013*

**science**

And I'd say B not A cuz brown bats are like keystone species and they are vital to the environment, some other bats might not be in the area etc. Or they might be the most plentiful
*December 9, 2013*

**science**

B I'd say, cuz there's probably lotsa other different types of that type of animal, (for example different types of bat, not just brown bats) so those animals would "fill in the gap"
*December 9, 2013*

**MATH**

2X-3Y=5 -2X -2X -3Y=5-2X DIVIDE BOTH SIDES BY -3 Y=-5/3+2/3X NOW DO THE SAME FOR THE OTHER ONE PLUG THE -2 IN FOR X Y=-5/3+2/3(-2) PUT IN CALC WATCH SIGNS!! Y=-3
*December 9, 2013*

**MATH**

Y=2X+4 Y=2(3)+4 Y=6+4 Y=10
*December 9, 2013*

**MATH**

CORRRECTION!!!! -4/5!
*December 9, 2013*

**MATH**

5X-Y=3 -5X -5X -Y=3-5X DIVIDE BY -1 ON BOTH SIDES Y=-3+5X PLUG IT IN PLUG IT IN 7=3-5(X) SOLVE SUBTRACT BY 3 ON BOTH SIDES 4=5X AND DIVIDE BY -5 ON BOTH SIDES 4/5=5/5X 4/5=X
*December 9, 2013*

**Trigonometry/Geometry - Inequalities**

Actually I solved it, but thanks :P
*December 7, 2013*

**Trigonometry/Geometry - Inequalities**

Let a, b, and c be positive real numbers. Prove that sqrt(a^2 - ab + b^2) + sqrt(a^2 - ac + c^2) is greater or equal to sqrt(b^2 + bc + c^2). Under what conditions does equality occur? That is, for what values of a, b, and c are the two sides equal? This looks like a geometry...
*December 7, 2013*

**algebra**

lol caps much?
*December 6, 2013*

**Trigonometry - Geometry - side lengths**

ohhhhh that makes sense i should have thought of that thanks!
*December 6, 2013*

**Trigonometry - Geometry - side lengths **

In convex quadrilateral ABCD, angle A is congruent to angle C, AB=CD=180, and AD is not equal to BC. The perimeter of ABCD is 640. Find cos A. Hmm...I drew the diagram, and labeled some things, I drew an altitude from D to AB and did some other things, but no success was ...
*December 6, 2013*

**science**

Which of the following...?
*December 6, 2013*

**language**

? or....? Anyways, the grammar is correct, I suppose.
*December 6, 2013*

**Algebra 2**

multiply all sides by 2x^2 1 + 4x^3 + 6x^2 = 0 let y = x^2 1 + 4y^2 + 6y=0 4y^2 + 6y + 1 = 0 Apply the quadratic formula then sqrt the answer to get the answer
*December 6, 2013*

**Classical Mechanics Physics**

:/ What did you do so far? Also, we're not really going to solve all your problems for you you have to at least make an effort
*December 6, 2013*

**statistics**

Where are the scores
*December 6, 2013*

**help**

first number ----> machine ----> 2nd number ---> machine ---> 3rd number ----> machine ----> 4th number = 271 Machine basically multiplies the number by 3 and subtracts 2. So we work backwards. 271 + 2 = 273. Divide it by 3 to get the 3rd number, 91. Do the ...
*December 6, 2013*

**physics**

Calculate the net work output of a heat engine following path ABCDA in Figure 14.30, where V1 = 5.0 10-3 m3 and V2 = 20.0 10-3 m3.
*December 6, 2013*

**physics**

The rate of heat conduction out of a window on a winter day is rapid enough to chill the air next to it. To see just how rapidly windows conduct heat, calculate the rate of conduction in watts through a 3.00 m2 window that is 0.600 cm thick if the temperatures of the inner and...
*December 6, 2013*

**math**

3/5 chance beofre of picking a purple marble 3/5 = 2+ 4 the rest of marbles = 4 so 4 / 4+4 = 1/2
*December 6, 2013*

**math**

......?
*December 6, 2013*

**English**

how does hawthorne use irony to criticize puritan society
*December 5, 2013*

**Science need help**

A group of students are setting up the first experiments, looking at the growth of roots in water containing an added factor. They have decided to grow seeds in both in pure tap-water and in water with a defined amount of vinegar added. As part of their group discussions they ...
*December 5, 2013*

**Trig-Weird Geometry Problem**

Thanks steve!
*December 5, 2013*

**Trig-Weird Geometry Problem**

Determine all triangles ABC for which tan(A-B)+tan(B-C)+tan(C-A)=0. There's a hint: "Can you relate A-B to B-C and C-A?" Should I apply the tangent difference formula (tan(x-y))? Help would be appreciated, thanks.
*December 5, 2013*

**math words problem**

B = 5600 + 71n
*December 5, 2013*

**Science need help**

nces.ed .gov/nceskids/help/user_guide/graph/variables.asp
*December 5, 2013*

**Geometry/Trigonometry**

Wow thanks a lot that helped!
*December 4, 2013*

**Geometry/Trigonometry**

Circles with centers (2,1) and (8,9) have radii 1 and 9, respectively. The equation of a common external tangent to the circles can be written in the form y=mx+b with m < 0. What is b? I drew the diagram and the tangents but to no avail. I cannot seem to find the points ...
*December 4, 2013*

**MATHS**

d + d+k + d+2k + d+3k + d+4k = 5d + 10k 4h term is d+3k = 9 5d + 10k = 85 5d + 15k = 45 -5k = 40 k = -5 and d = 9 + 15 = 24
*December 4, 2013*

**algebra**

difference is 12 dollars per month so for them to be the same the 0.15 needs to catch up to 0.25 by 12 dollars 12 / 0.25-0.15 = 12 / 0.1 = 120 minutes
*December 3, 2013*

**Trigonometry/Geometry**

Oh thank you very much sir!!
*December 3, 2013*

**Trigonometry/Geometry**

Rhombus ABCD, with side length 6, is rolled to form a cylinder of volume 6 by taping AB to DC. What is sin(angle ABC)? I don't know how to begin. Help?
*December 3, 2013*

**physics**

A dock worker loading crates on a ship ﬁnds that a 29 kg crate, initially at rest on a horizontal surface, requires a 90 N horizontal force to set it in motion. However, after the crate is in motion, a horizontal force of 60 N is required to keep it moving with a ...
*December 3, 2013*

**physics**

A dock worker loading crates on a ship ﬁnds that a 29 kg crate, initially at rest on a horizontal surface, requires a 90 N horizontal force to set it in motion. However, after the crate is in motion, a horizontal force of 60 N is required to keep it moving with a ...
*December 3, 2013*

**math**

Thank you
*December 3, 2013*

**math**

Thats what i thought, the question said logical reasoning
*December 3, 2013*

**math**

Two sides of an isosceles triangle are 13 inches and 16 inches. What are two possible perimeters ? IS one 42 ?
*December 3, 2013*

**math**

Thank you. Ms. Sue
*December 3, 2013*

**math **

3 identical tables are 3 1/2 ft wide and 5 1/4 long. To make one long table, they are pushed together to share thrir short ends. What is the perimeter of the long table ?
*December 3, 2013*

**math**

3.865. Thank you. Didnt know about / 1000
*December 2, 2013*

**math**

A group of hikers walk to a lake near the park. They hike 2,408 meters to the lake. They take a shortcut back to the park that is 1,457 meters long. How many kilometers is their hike ?
*December 2, 2013*

**Geometry**

You use a copy machine to enlarge an 8” 11” document, and you choose the 136 % enlargement setting. What will be the dimensions of the enlarged document? Round to the nearest hundredth of an inch.
*November 29, 2013*

**german**

So, yeah, everyone here is correct. It would be placed at the end of the sentence. so it would be like "Wir (subject) wollen (modal) Brot (other stuff) essen (other verb)" Probably not the best example, but things follow that format.
*November 27, 2013*

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