Wednesday

September 28, 2016
Total # Posts: 4,926

**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*

**Science**

When calculating the distance to extremely distant stars using parallax, astronomers use incredibly accurate instruments. Why is this important? Please help Thank you

*November 25, 2013*

**Science**

When using the method to calculate the distance to stars, astronomers measure the parallax angels exactly 6 months apart. Why? Please help!

*November 25, 2013*

**Physics**

James joule measures temperature of the water at the top and bottom of the waterfalls. If one of these waterfalls is 55m high, and all gravitation energy of the water is at the top of the falls. What temperature difference would be between the water at the top and bottom? (...

*November 25, 2013*

**Physics**

James joule measures temperature of the water at the top and bottom of the waterfalls. If one of these waterfalls is 55m high, and all gravitation energy of the water is at the top of the falls. What temperature difference would be between the water at the top and bottom? (...

*November 25, 2013*

**Math-Algebra**

What have you done so far?

*November 24, 2013*

**Trig-Geometry - Law of sines and cosines**

Hello everyone, I've been struggling on this problem for quite some time. It would be appreciated if you could help. Thanks. (The website is the diagram, it is a screenshot) In the diagram below, triangle ABC has been reflected over its median AM to produce triangle AB'...

*November 24, 2013*

**math**

13/43 * 30/43* 30/43 Unless I am wrong. This may be more complicated than I think.

*November 24, 2013*

**biology**

D acetyl coa or coenzyme A

*November 24, 2013*

**biology**

At the end of the electron transport chain when electrons & H+ & O2 combine. Oxygen is the final electron acceptor.

*November 24, 2013*

**Admin?**

Hi do you know who the admins are or the moderators? thanks

*November 21, 2013*

**Law**

You probably want a new Vehicle identification number to prevent authorities from trakcing you down, so probably A, or maybe B. definitely not C or D ;)

*November 21, 2013*

**Math**

23/100 23% 0.03 3% 0.325 32.5% 1/4 25% 0.6 60% 0.75 3/4 12.5% 0.125 100% 1.00 1/1

*November 21, 2013*

**Math**

Sorta confused about the question, what do you mean?

*November 21, 2013*

**math**

1, 1, 5, 5 2, 2, 4, 4 3, 3, 3, 3

*November 21, 2013*

**maths**

What do you mean by the underscore?

*November 21, 2013*

**Trigonometry/Geometry - Law of sines and cosines**

In most geometry courses, we learn that there's no such thing as "SSA Congruence". That is, if we have triangles ABC and DEF such that AB = DE, BC = EF, and angle A = angle D, then we cannot deduce that ABC and DEF are congruent. However, there are a few special ...

*November 21, 2013*

**math**

Nice, good job.

*November 21, 2013*

**maths**

underscore = ?

*November 21, 2013*

**Math**

0.721 x 100 means move decimal point to the right 2 spaces, so it should be 0.721 --> 7.21 ---> 72.1 72.1

*November 21, 2013*

**Trig-Medians and law of cosines and sines**

thanks a lot man!

*November 20, 2013*

**Trig-Medians and law of cosines and sines**

In triangle ABC, we have AB=3 and AC=4. Side BC and the median from A to BC have the same length. What is BC? Not making sense to me, I think the answer must be simple, but I don't know how to solve I applied the law of sines but to no avail. Help is appreciated, thanks.

*November 20, 2013*

**math**

use a calculator.... 25/41 is more than 1/2 13/30 is less thus 25/41 is greater

*November 19, 2013*

**Maths**

Uh......what...?

*November 19, 2013*

**literature**

the answer is definitely not c thats for sure I'd agree with you on the answer A since Franklin is sorta mocking the idea of witchcraft etc.

*November 19, 2013*

**Advanced Functions**

I guess so

*November 19, 2013*

**Advanced Functions**

Oh wow, we got teh same answer reiny cool

*November 19, 2013*

**Advanced Functions**

sin 60 cos 30 sin 120 (all degrees, not radians)

*November 19, 2013*

**algebra**

if you meant 499.79 - 15099000000 then the answer is -1509899500 please specify exatly what you mean it's not clear.

*November 19, 2013*

**Chemistry**

2.

*November 19, 2013*

**English**

what do you do in church, you meditate. so I'd say rink because what do you do in a rink, you skate.

*November 19, 2013*

**6th grade math**

yup you're right,

*November 19, 2013*

**Trig - Law of sines and cosines**

Thanks a lot

*November 19, 2013*

**Trig - Law of sines and cosines**

ABC is an equilateral triangle with side length 4. M is the midpoint of BC, and AM is a diagonal of square ALMN. Find the area of the region common to both ABC and ALMN. I drew the diagram but I don't know how to find the answer? I think it has something to do with the law...

*November 19, 2013*

**English**

C thermometer measures heat seismograph measures tremors (record and measure earthquakes)

*November 19, 2013*

**English**

which analogy

*November 19, 2013*

**English**

remember, a toe is part of the foot(there are 5 toes on a foot) which of the answers is part of another thing(there are 5 of the first on the second)

*November 19, 2013*