Wednesday

July 29, 2015

July 29, 2015

Total # Posts: 149

**maths **

Show that r = 1/4 - 3Cos¦È is polar form of an ellipse and find its centre. pls can anyone could help with this.
*May 11, 2015*

**Math**

-1^2 = 1 so f(2) = 2*1 = 2. (by multiplication)
*May 11, 2015*

**Math**

thanks so much irving
*April 16, 2015*

**Math**

is the correct answer 2800 marbles
*April 16, 2015*

**Math**

3.Josh has a huge marble collection. He counts 280 marbles that are red, and he estimates that this is about 10% of his collection. A.Write and solve a proportion to estimate the total number of marbles Josh has.
*April 16, 2015*

**Math**

thakns irving
*April 16, 2015*

**Math**

did she get 53 problems correct
*April 16, 2015*

**Math **

Mia took a test with 60 multiple-choice questions. Her teacher told her she got 88% correct. A.Write and solve a proportion to figure out how many questions she got correct.
*April 16, 2015*

**Math**

and the proportion answer is 80% right?
*April 16, 2015*

**Math**

i think the unknown in this problem is the percent
*April 16, 2015*

**Math**

1.A restaurant surveys 60 of its customers about their new menu. 48 of the customers that take the survey prefer the new menu. A.Which value is unknown in this problem: the part, percent, or whole? B.Write and solve the proportion to find the percent of the customers that ...
*April 16, 2015*

**math**

4.In Amy’s English class, 30% of the students play an instrument. She does not know how many in the whole school play an instrument, but there are 500 students in the school. A.Solve the proportion 30/100=n/500 to estimate the total number of students in the school who ...
*April 15, 2015*

**Science**

you welcome :-)
*April 15, 2015*

**Science**

you could put that vinegar has the most density because it sinks to the bottom unlike the oil which has bouyancy that keeps it afloat.
*April 15, 2015*

**Science**

yes it's a very reasonable answer
*April 15, 2015*

**Math**

3.Max says there were 6 students wearing shorts in his math class. He is not sure how many people were in the class, total, but he thinks about one third of them were wearing shorts. A. What percent is closest to 1/3 ? Explain. B.Write and solve a proportion below, to estimate...
*April 15, 2015*

**Math**

is that the answer?
*April 15, 2015*

**Math**

What is 21.21% rounded to two decimal places?
*April 15, 2015*

**maths(direction cosines of vectors)**

find the direction cosines of the vector joining the two points (4,2,2,) & (7,6,14) (this is new to me, used to think it was just one point not two.)
*March 9, 2015*

**maths **

What's the coefficient of x^2 in the expansion of (2 - 1/2x)^4 (I've no idea hw to go bout this & I would also like to know under which topic it falls)
*March 2, 2015*

**math**

I was d one dat posted d previous question, I had to re-post again cos d plus sign won't show after I click submit
*March 2, 2015*

**math **

The line x plus 7y=5 cuts the circle x^2 plus y^2=15 at the points P & Q. Find: a) P & Q. b) the midpoint of PQ. (I don't know why, but the plus sign does not show after I submit d question so dats y I wrote it in words)
*March 2, 2015*

**Maths**

there's a plus sign in btw x & 7y, d system prolly removed it. x plus 7y=5 x^2 plus y^2=15
*March 2, 2015*

**Maths **

The line x 7y=5 cuts the circle x^2 y^2=15 at the points P & Q. Find: a) P & Q. b) the midpoint of PQ.
*March 2, 2015*

**physics(waves)**

A wave has a speed of 340m/s and a period of 0.28ms. what's the wavelength? so I worked this and I got 95.2m but the answer to d question says 0.095m. period(T) = 1/F (since F = 1/T) therefore, F = 1/0.28 = 3.5714 wavelength = velocity/frequency w = 340/3.5714 = 95.2m (Isn...
*February 23, 2015*

**Calculus **

If Y = SecXTanX, find y" 4y' 4y. I can easily do the second part of the question if I could if only I could find d first and second derivative of SecXTanX, pls do help.
*February 9, 2015*

**Differentiation **

If Y = e^tanx, find dy/dx
*February 9, 2015*

**Calculus**

The volume of a solid
*February 6, 2015*

**calculus **

lim x->0 (Sin^3 3x - 3x^3)/(x^3) (x^4)
*January 29, 2015*

**Math**

Could u show the workings, pls. I knw, I =PRT/100 P=$1600.00 R=7% so which are we looking for, I or T?
*January 28, 2015*

**Calculus**

lim x->0 (Sin^3 3x - 3x^3)/(x^3) (x^4)
*January 28, 2015*

**Calculus **

Evaluate lim x->0 (Sin^3 3x - 3x^3/x^3 x^4) I got zero (0) to be my answer by imputing 0 in place of x but am not so sure if the answer should be 0, am thinking it should be like 1/0 or something like that.
*January 28, 2015*

**Algebra 1**

no, its should be 4.8 ¡Á 10^8
*January 28, 2015*

**Calculus **

Find ¡Ò[dx/(x-2)(x+3)(x-4)] this is really confusing and I need help with it.
*January 28, 2015*

**Calculus **

differentiate tan-1(2x/1-x^2)
*January 27, 2015*

**vectors**

a = (A plus B), b =(B plus C), c =(C plus A)...I add added the plus symbol in between b4 submitting, don't know why it's not show.
*January 26, 2015*

**vectors **

Show that a¡Á(b c) = (a¡Áb) (a¡Ác), given that a =(A B), b =(B C), c =(C A). WORKINGS ... given, a¡Á(b c) = (a¡Áb) (a¡Ác) :. imputing the values of a, b and c (A B)¡Á[(B C) (C A)] = [(A ...
*January 26, 2015*

**trig**

Sin = Opposite/Hypotenuse, Cos = Adjacent/Hypotenuse, Tan = Opposite/Adjacent. To remember, memorize as SOH, CAH, TOA. Where A = Adjacent, H = Hypotenuse, O = Opposite. Since we were given the opposite side and one angle & we're to find the hypotenuse, therefore, you use ...
*January 5, 2015*

**Physics**

Yea, you get to use F=MxA where, M=mass, A=acceleration. if you expand the equation, you notice F=MxA where A=velocity change / time taken for change therefore, f = 1kg x (5ms/5secs)
*January 1, 2015*

**Advanced Algebra **

If a pond can support up to 10, 000 fish, the rate of growth of the fish population is jointly proportional to the number of fish present and the difference between 10, 000 and the number of fish present. The rate of growth is 90 fish per week when 1, 000 fish are present. a. ...
*November 15, 2014*

**College Algebra**

How to solve this system? x + [(3x-y)/(x^2+y^2)] = 3 y - [(x+3y)/(x^2+y^2)] = 0
*October 11, 2014*

**mechanics and fluids**

a block of mass 6 kg resting on a horizontal surface is connected by a cord passing over a light, frictionless pulley to a hanging block of mass 4 kg. the coefficient of kinetic friction between the block and the horizontal surface is 0.5. after the block are released, find ...
*September 8, 2014*

**physics**

I don't understand what you tryna say.
*July 31, 2014*

**physics **

A solid of mass 1kg suspended by a string is completely immersed in water. If the tension in the string is 5N, calculate the upthrust on the solid. (take g = 9.78m/s)
*July 31, 2014*

**physics**

I still don't understand.
*July 31, 2014*

**physics **

Calculate the energy required to vapourise 50g of water Initially at 80¡ãC if the specific heat capacity of water is 4.2 J/g.k. (specific latent heat of vapourisation of water is 2260 J/g)
*July 31, 2014*

**maths**

2x^2 + 2y^2 - 8x + 5y + 10 = 0
*July 30, 2014*

**physics**

Constructive interference will occur, cos constructive interference occurs wen d path difference btw identical waves at a point is n¦Ë...where n = 0,1,2,3... Destructive interference occur wen d path difference btw two identical waves at a point is n¦Ë ...
*July 30, 2014*

**Maths (differentiation)**

Differentiate Y = 1/SinX^2
*July 28, 2014*

**maths**

Thank you you're awesome
*July 18, 2014*

**maths**

factorize completely X^2 + 2X^2 - 15X / 2X^2 - 18
*July 18, 2014*

**Maths (factor theorem)**

9x^2 6xy 4y^2 is a factor of 27x^3 - 8y^3, find the other factor.
*July 18, 2014*

**Maths **

(243/32)^-1/5 ¡Á 2^-2
*July 18, 2014*

**Maths**

if p:q=2/3:1/6 & q:r=3/4:1/2. find p:q:r
*July 18, 2014*

**Physics**

The tension in the string provides the centripetal force for objects tied to a string & movin in a circular path. Ft = mv^2/r where m=mass of d object, v=uniform velocity of d movin body & r=radius of d circle formed by d moving string 1 revolution = 360¡ã or 2pie...
*July 18, 2014*

**world history**

Search on Google.
*June 1, 2014*

**Math**

1 - 2/7 = (7 - 2)/7 = 5/7
*May 29, 2014*

**Science 1 question**

If you're doubting check google, I'm positive that it's A.
*May 21, 2014*

**Science 1 question**

The answer is A.
*May 21, 2014*

**maths/permutation and combination **

Find the number of ways, the digits 0,1,2 and 3 can be permuted to give rise to a number greater than 2000. Please I need an explanatory workings!!!
*May 21, 2014*

**Maths (Integration)**

Please can you show an explanatory working, just to be able to work a similar question. thanks
*May 21, 2014*

**Maths (Integration)**

Integrate(1+x/x^3)dx Don't know how to go bout this, if the numerator was a whole number it would ve been easier for me, Pls help me out.
*May 21, 2014*

**Maths**

Sorry one more thing, how do you get the slope?
*May 21, 2014*

**Maths**

Alright, thanks.
*May 21, 2014*

**Maths**

ok, can you pls direct me on how to work a similar question?
*May 21, 2014*

**Maths**

So the question is wrong?
*May 21, 2014*

**Maths**

find the equation of the perpendicular bisector of the line joining P(2, -4) to Q(-5,1) A. 8y-14x 13=0 B. 8y-14x-13=0 C. 8y 14x-13=0 D. 8y 14x 13=0 Please I need someone to help me with this, with an explanatory workings.
*May 21, 2014*

**Trig**

angle of 25 degrees is measured, point 'M' our obtuse triangle is then 'TBM' and we also define a point 'G' that is at ground level and colinear with points 'T' and 'B' such that 'MBG' forms a right triangle whose hypotenuse is ...
*April 15, 2014*

**Algebra - Functions**

1) Given that F(x) = -5+7x^2, find and simplify: 8F(x) = F(8x) = 2) Find the domain of the function: f(x) = -2x+12 q(v) = ^9sqrt(-3v+14) f(x) = [(x-5)/(sqrt(15-x))] B(y) = [7/(81-(1/y^2))]
*February 26, 2014*

**MATH ANALYSIS & TRIG**

At noon, Al is 6km north of point O traveling south at 10km/h. Also at noon, Barb is 2km east of point ) traveling east at 5km/h. A) express the distance "d" between Al and Barb as a function of time "t" hours after noon. B) Find the time at which the ...
*October 29, 2013*

**Chemistry**

A sample of iron weighing 15.0 g was heated with potassium chlorate (KClO3) in an evacuated container. The oxygen generated from the decomposition of KClO3 converted some of the Fe to Fe2O3. If the combined mass of Fe and Fe2O3 was 17.9g,calculate the mass of Fe2O3 formed and ...
*August 22, 2013*

**physics**

A toboggan slides down a hill and has a constant velocity. The angle of the hill is 6.50° with respect to the horizontal. What is the coefficient of kinetic friction between the surface of the hill and the toboggan?
*June 30, 2013*

**math**

A tractor tyre has a radius of 7cm and it made 1600 complete revolutions on a journey.How many metres did the tyre travel?
*June 4, 2013*

**science**

you are asked to make a 0.3M Calcium chloride solution in a flask that can hold 200ml.How would you do it.
*February 16, 2013*

**math**

tilissa was on the middle rung of a ladder.she went up 3 rungs,thendown 5 rungs and then up 7 rungs where she rested.later she climbed up the remaining 7 rungs on the ladder.how many rungs did the ladder have?
*January 27, 2013*

**English HL**

I dont know what to write that's why i need help on ma essay
*January 27, 2013*

**English HL**

An essay about("Be quiet,"the leader hissed."they, mustn't know we are here".
*January 27, 2013*

**Physics**

A slingshot with k = 400. N/m is pulled back 0.0500 m to shoot a 0.100-kg stone. If the slingshot projects the stone straight up in the air, (a) what is the speed when the stone is first released, and (b) what is the maximum height to which the stone will rise? [neglect ...
*December 27, 2012*

**Physics**

Thanks so much! Yeah, it's weird it says 0.05 meters. Thanks though!
*December 27, 2012*

**Physics**

A slingshot with k = 400. N/m is pulled back 0.0500 m to shoot a 0.100-kg stone. If the slingshot projects the stone straight up in the air, (a) what is the speed when the stone is first released, and (b) what is the maximum height to which the stone will rise? [neglect ...
*December 27, 2012*

**math**

I work 1 and 1/4 hour per day how many hours do I work per week and for five weeks
*November 26, 2012*

**gallegos **

"Robert can swim the first 50 meters of a race in 1 minute. Then he slows down by 12 seconds for each of the next 50 meters of a race. How long will it take Robert to swim a 400-meter race?
*November 26, 2012*

**gallegos **

"Robert can swim the first 50 meters of a race in 1 minute. Then he slows down by 12 seconds for each of the next 50 meters of a race. How long will it take Robert to swim a 400-meter race?
*November 26, 2012*

**Social Studies**

List the unique circumstances of the interwar period that may have led to ultranationalism.
*October 22, 2012*

**Social Studies**

Which underlying circumstances occurring during the interwar period of 1919 to 1939 may have influenced whether or not nationalist interest was nationalist or ultranationalist?
*October 22, 2012*

**Social Studies**

What national interests lead to ultranationalism?
*October 22, 2012*

**Math Ratios**

LOLZ CAT
*September 13, 2012*

**spanish**

1). What is a "cognate"? 2). Why is learning cognates the most efficient and rapid way to learn to read, speak, increase vocabularly and get high marks on tests in a foreign language? Bonus question: What is the relationship between "cognates" and "...
*June 23, 2012*

**vocab**

These are alternatives, but not synonyms: myopic = short-sighted incompetent = doesn't know how homicidal = wants to kill people cannibal = likes to hunt and eat other people tallest shortest strongest
*June 23, 2012*

**social studies**

The first thing to know about this question is that it is about a hotly-debated political topic. People on different ends of the political spectrum have different answers to offer. There is NO answer that everyone agrees is true or most meaningful. To see the opposing ...
*June 20, 2012*

**College**

underwriter
*June 19, 2012*

**College Essay**

Your "story" works as creative writing, but not as a college admissions essay. Look for the word "special" in the essay question and you probably won't find the word "special." "Special" is NOT synonymous with "significant,"...
*June 18, 2012*

**College Essay**

Since this essay is a "common essay" and will be seen by all of the schools to which you apply, it is a very important essay. It can determine whether you get into any of your favorite schools. I take your essay seriously. This response comes from a lawyer who wrote ...
*June 18, 2012*

**spanish**

1. Cómo estás? (informal) /Cómo está usted? (formal) 2.) No me interrumpes. (informal) No me interrumpe. (formal)
*June 17, 2012*

**SPELLING HELP**

Will my teacher eject me from class and from school if I copy someone else's essay? If she doesn't eject me, will she still consider me to be morally bankrupt? I asked someone to write my story for me, but she objected. She projected onto me the motive of using the ...
*May 21, 2012*

**trig**

If x and y are complementary angles and 5 tan x-12=0,calculate by using a diagram the value of 2sin(squared)x+cos y.
*May 3, 2012*

**math**

Use SOH, CAH, TOA which is Sin20 = opposite/adjacent, Cos20 = adjacent/hypotenuse, Tan 20 = opposite/adjacent
*March 10, 2012*

**Geography - Italy**

I would really appreciate some help to find some information. -Thanks, Francis
*March 1, 2012*

**Geography - Italy**

My teacher gave us a reprt to do a brochure on italy such as currenices, goverment, sports, restaurants, and so far I have about 2 good website (withuout wikipedia!!!).
*March 1, 2012*