Friday
September 19, 2014

Posts by Sam


Total # Posts: 3,989

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

Calculus
:)
December 9, 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

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