Thursday

July 24, 2014

July 24, 2014

Total # Posts: 99

**probability**

0.33

**Maths**

1<p<12 Therefore a=1 b=12

**physics**

A 83 kg person escapes from a burning building by jumping from a window 21 m above a catching net. The acceleration of gravity is 9.81 m/s 2 . Assuming that air resistance is simply a constant 92 N force on the person during the fall, determine the person’s velocity just ...

**Science**

lol cool!! im in connections too in 7th grade

**mATH**

wat is 80÷3=?

**math grade 11**

in a reflection the image of the line y-2x=3 is the line 2y-x=9.find the axis of reflection.

**Chemistry**

thanks for the help. im still a bit confused.,, [23.5g x 6.02] + [? x 2.09 x (Tfinal- 0)] + [550.g x 4.184 x (Tfinal- 28.0)] = 0 is this right so far? How would you be able to get the mass of melted ice?

**Chemistry**

An ice cube at 0.00 degree celsius with a mass of 23.5 g is placed into 550.0 g of water, initially at 28.0 degree celsius, in an insulated container. Assuming that no heat is lost to the surroundings, what is the temperature of the entire water sample after all the ice has me...

**Chemistry**

balance this equation NaOH + H2SO4 = NaSO4 + H2O

**calculus**

Find the intervals on which the f(x)= cos^2x is concave up and concave down.

**Math**

2y^2 -8y -3 = 0 please solve

**Math**

2y^2 -8y -3 = 0 please solve

**Math**

2y^2 -8y -3 = 0 please solve

**Math**

2y^2 -8y -3 = 0 please solve

**Math**

2y^2 -8y -3 = 0 please solve

**Math**

please help

**Math**

prove that sinA/(1+cosA) + (1+cosA)/(sinA) = 2cosecA

**MATH **

THE LINE Y=X+4 INTERSECTS THE CURVE 2X^2 + 3XY - Y^2 + 1 = 0

**MATH **

THE LINE Y=X+4 INTERSECTS THE CURVE 2X^2 + 3XY - Y^2 + 1 = 0

**matj**

prove that (cotx+tanx)(cotx-tanx) = 1/(sin^2 x) - 1/(cos^x)

**math**

thanks

**math**

3+siny = 3cos^2 y for 0<Y<360

**Math**

how do i know if the tangent is positive in the third quadrant?

**Math**

solve 4 sin x = cos x for 0<X<360

**Math**

thanks man

**Math**

g(x) = 3x+5 / x-1 find the inverse function

**Chemistry**

You need to prepare 2 M solutions, with 10 g of solute. What volume of solution will you prepare for ammonium nitrate, NH4NO3?

**IGCSE Chemistry**

Thanks

**IGCSE Chemistry**

Hydrocarbons A and B both contain 85.7 % carbon. Their molar masses are 42 and 84 respectively. a) Which elements does a hydrocarbon contain? b) Calculate the empirical formula of A and of B. c) Calculate the molecular formula of A and B. I solved a) and b) the solutions are a...

**Chemistry**

i think it only has two bond angles that are 120 and 180 only

**Math**

A man and his wife share a sum of money in the ratio 3:2. If the sum of money is doubled, then in what ratio should they divide it so that the man still receives the same amount?

**Chemistry**

K2= +1 Cr=+6 o=-2

**chemistry**

1.2x10^-6

**physics**

at time t=0 the driver starts to brae determine how long the bus takes to stop

**physics**

A 2 kg box slides down a 25 degree ramp with an acceleration of 2 meters per second. Determine the coefficient of kinetic friction between the box and the ramp?

**Chemistry**

Please explain the process of diffusion.

**AP Physics**

See how to solve from a pro who is undergoing IGCSE courses which are better than US High School courses mgh=1/2mv^2 1/2mv^2=mgh mv^2=2mgh V^2=2mgh/m V= square root of 2gh

**Trig**

8 csc theta - 2=10 + 2 csc theta I can't do it. :S

**College Admission**

I am currently outside USA. Now in Asia we follow the Cambridge igcse curriculum. If I move to USA can I still get into an Ivy League college?

**SAT**

This is definitely not homework. I just want to know what would be the best book for preparing my self for the SAT.

**Physics**

Say what energy changes are taking place: a)clockwork toy b)boy kicking soccer ball c)boiling kettle on a gas ring d)person walking upstairs What are the wasted energy in a) b) c) and d)?

**Physics**

Metal expands more than glass when both are heated. How can this fact be used to help open a metal screw top on a glass bottle which appears to be stuck?

**Algebra**

x^2+y^2=86 and xy=(-16), Find the value of (x-y)^2 Please help i am a bit tense today so i can't figure it out.

**Math**

thanks a lot. I really apreciate your help.

**Math**

Please help me solve this equation -5t+2=-2t*2

**Chemistry**

Sulfur Trioxide can be dissolved to form sulphuric acid. But it is avoided since the reaction is violent. Explain why?

**Physics**

What is the difference between magnetic field of a bar magnet anf the magnetic field around a current-carrying coil? Please answer with a good explanation.

**Math**

5/6

**math**

The answer is A)11. In my country we do this in grade 7. You just need to use unitary method.

**Physics**

If you cut a magnet in half does each half become a magnet. Give a clear explanation to your answer.

**Physics**

My question is how does metal corrosion affect a reed switch? This question is from my textbook. We are following cambridge igcse science.

**Math**

The shipping department must send out 50 cases of quarters. Five stores will receive ten cases each. How many cases are left?

**Math**

ok thanks

**Math**

[x+5]> 1 -

**Math**

Solve the inequality: Absolute Value of X+5 is greater than or equal to 1. I'd appreciate someone telling me how to solve it and get the answer. Thank you

**Math**

Solve the inequality: absolute value of x+is greater than or = to1. What form do you put it in? I missed class, and would appreciate someone telling me how to do this problem. Thanks!

**Science**

What roles do these systems play in supporting cellular respiration? -digestive system -repiritory system -circulatory system

**Distance Problems**

A bus and a car leave the same place and travel in opposite directions. If the bus is traveling at 50 mph and the car is traveling at 55 mph, in how many hpurs will they be 210 miles apart. Again please help me with the boxes, Im in advanced math and I'm not good with the ...

**Distance Problems**

A bus and a car leave the same place and travel in opposite directions. If the bus is traveling at 50 mph and the car is traveling at 55 mph, in how many hpurs will they be 210 miles apart. Again please help me with the boxes, Im in advanced math and I'm not good with the ...

**Distance Problems**

John took a drive to town at an average rate of 40mph. In te evening he drove back at 30mph. If he spent a total of 7 hours traveling, what is the distance traveled by John? Please set up the boxes and help solve.

**Distance Problems**

James and tom are in 2 cities which are 186 miles apart and travel towards eachother. James' average rate was 32 mph, and Tom's average ratewas 36mph. If James started at 9:00am and Tom's startes at 9:30 what time did they meet? I need help settign up the boxes. SO...

**Math**

At 11:00am a car (1) leaves city "A" at a constant rate of 60 mi/hr toward city "B". AT the same time a second car (2) leaves city "A" at the constant rate of 50 mi/hr. The distance between cities A and B is 220miles and a highway used by the two ...

**Math**

2 cyclists start at the same tiem from opposite ends of a course that is 45 miles long. One cyclist is riding at 14 mph and the second is riding at 16mph. How long after they begin will they meet?

**8th grade science**

thanks again mr.bob i appreciate it

**8th grade science**

why is diffusion important to living things? (organisms) u get full credit no worries! =]

**8th grade science**

thanks! and I took your advice on my short story (deeper ever deeper) and I got a 100 I really appreciate what you did and I strongly look up to your critisism. ty

**8th grade science**

I need some websites for the answers to these questions: What is diffusion? What causes diffusion? Why is diffusion important to living organisms? Thanks, AMir

**english check ms.sue**

Ooh that must feel horrible flunking a coarse. Yeah.... wouldn't liek to plagerize...

**Please read my short story deeper Ever deeper**

It is close to the middle. U'll see it its the one with millions of comments and replies lol.

**Please read my short story deeper Ever deeper**

thanks for tellign me I guess I got to fix it. I really needed that but it wouldn't be that good when you can tell what the girl is thinking. That is why I wanted to surprise the reader by having the girl reject him. Please tell me what I should right. It's due tomarrow

**Please read my short story deeper Ever deeper**

Pleeeeeeeeeeeeaaaaaaaasssssssse read my short story, it's down here, and I need to have it read by ppl. - - - - - V

**My short Story called deeper ever deeper**

ty, Jake is a teen, but I guess your right about that no crying part. He's snesitive i guess? =] I'm kiddign thanks for the help

**My short Story called deeper ever deeper**

ty

**My short Story called deeper ever deeper**

“Emily, I was wondering if you’d like, I don’t know, like to have dinner with me maybe anytime this week?” Jake was sweating. He was actually doing it. He was looking deep into her eyes, and going deeper, ever deeper. But it was the wrong thing to do. “...

**My short Story called deeper ever deeper**

“I can do it,” Jake thought. “All I have to do is look deep into her eyes, and tell her.” Like that would be easy. He started walking towards her and as soon as he reached her, he kept going on to his next class. At his next class, all Jake could think abou...

**My short Story called deeper ever deeper**

Please read this and tell me what you think. It's due tomarrow. Any constructive critisism is appreciated greatly. “Wow, she’s hot!” Jake Petri thought as he his gaze left his paper and trailed off to Emily Runner from across the classroom. If only he could ...

**3rd grade**

267 +307 ----- 574

**Math age problem**

louise is 4 years younger than jennifer now. In 10 years, louise will be twice the age that jennifer is now. Please help me set this up. It's an age problem.

**math**

louise is 4 years younger than jennifer now. In 10 years, louise will be twice the age that jennifer is now. Please help me set this up.

**Question (Literature)**

There is one quote but i forgot who said this: "no science can replace a myth, and no myth can ever replace science." Basically I think what it means is that literature and science are complete opposites. Hope that helps.

**Spanish**

tysm ur a genius

**Spanish**

how do you say: That is teh coolest thing I have ever heard in my life! in spanish. Tysm

**Dr. bob please help-chemistry**

Use the ruler to measure the circumference of the marble as accuratley as you can, then divide the circumference by 3.14159, or pi. That should give you your answer.

**math**

Oh sweet rhombus, called diamond so, beautiful and glamerous, you put up quite a show, in geometry you are a pain, but on your finger you are bright, so this is a poem about rhombus, I recited it tonight. This is something that I just made up at the top of my head... You might...

**psychology**

The production of new brain cells is neuro-transmitters, and mylen. I hope this helps!

**5th grade**

well what you could do is find a lcd or least common denominator between these numbers. In this case I believe its 560. 560/10=56, 560/8=70,569/7=80 Now you get 7/10= 392/560 5/8=350/560 3/7=240/560 I hope this is what your looking for... =]

**math**

This is my work: D-1 5 -----= -- Cross multiply you get: 2D-2 4 10D-10=4D-4 -4D -4D 6D-10=-4 +10+10 6D=6 ----- 6 6 D=1?

**OOPS again math**

Oh now I get it. in the last step 3D=39 ----- 3 3 so D=13 tysm! your a genius.

**math**

The numerator of a fractionis 5 less than twice the denominator. If the numerator is decreased by 1 and the denominator is increased by 3, the value of the new fraction is 5/4. Find the original fraction.

**math**

thanks thats what i got just making sure =]

**math**

is it 60 im confused i missed class today so, i really didn't get the whole of the lesson. =)

**math**

find two consecutive even integers such that 5 more than the first is divided by 2 less than the second, the result is 13/12.

**algebra**

a+6a=7a 7a+(-9) =30 add -9 to both sides 7a=21 divide 7 by both sides a=3

**science**

thank you!!

**science**

is the density of a metal (like aluminum) the same no matter what the size of aluminum?

**algebra**

4n-2n = 2n 2n=18 divide both sides by 2 to isolate the n n=9

**Math**

assuming you can use the numbers more than once.... 24/2 = 12 12*12 = 144 144/2 = 72 72-24 = 48 48-24=24

**math**

-7 1/8 + 4 3/4 -7 1/8 + 4 6/8 -6 9/8 + 4 6/8 now subtract -2 3/8 - bud is correct.

**chemistry**

Hi. I'm not sure if my strategy for this problem is correct: How many grams of CaCO3 will dissolve in 3.0x10^-2 mL of 0.050M Ca(NO3)2? I think I'm supposed to convert molarity of Ca(NO3)2 into moles, but then i don't know how to get from mols of that to mols of CaC...

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