Sunday

May 29, 2016
Total # Posts: 40,892

**geometry**

no table?
*May 28, 2016*

**Bio**

a miracle. The genetics of rabbit hair color are very compliated. The genetics of the white rabbit with BLUE eyes is even more complicated.
*May 28, 2016*

**SCIENCE HELP**

2.3.4,6 nope, think harder.
*May 28, 2016*

**Math- Prob Stat**

you test the outcomes over time, to see if the outcomes are within the confidence intervals of the theoritical probability. And, one has to define fair.
*May 28, 2016*

**Calculus**

d^2=(12t)^2 + (19t)^2 where t is time in hours sailing. In this case, t=1hr take the derivative 2d dd/dt=2*144t+2*19^2 t dd/dt = relative velocity v= (288 +261)/d where d=sqrt(12^2+19^2)
*May 28, 2016*

**Calculus**

d^2=(12t)^2 + (19t)^2 where t is time in hours sailing. In this case, t=1hr solve for d.
*May 28, 2016*

**SCIENCE PLZZ HELP!!!**

strong base has very few H3O+ ions
*May 28, 2016*

**Physics**

The simple answer is yes, it is going 20k mph. However, that is a simple answer.
*May 28, 2016*

**Physics**

velocity has to be relative to something. What was the planet moving at 10Kmph relative to? Was it moving? What was the rocket relative to?
*May 28, 2016*

**Mathematics**

w=ax+bx^2+c 169=5a+25b+c 18=3a+9b+c So, assume c=0 first find a and b. multiply first equation by 3, second by 5 169*3=15a+75b 90=15a+45b subtract second equation from first 507-90=30b b=13.9 then find a in the second equation then, go to the original statement, check it with ...
*May 28, 2016*

**business math**

http://www.calculatorsoup.com/calculators/financial/depreciation-declining-balance.php
*May 28, 2016*

**Physics**

Pressure is the same, and the area of the output is proportional to the ratio of diamenters squared, so output force=(16/4)^2 *170N = 16*170N
*May 28, 2016*

**physical science**

Hydrogen bonding has a great effect on cohesive forces on molecules.
*May 28, 2016*

**Maths**

the tile has to be evenly divisible into 11.2 and 7.2 area=11.2*7.2=80.64 I see that .2 will go in both evenly. tiles .2x.2= .04 area number tiles=80.64/.04
*May 28, 2016*

**Physics**

mass=density*volume=density*area*t thickness=mass/density*area = 6.20E-6kg/(19.300kg/m^3*(2.98cm^2)(m/100cm)^2 = 6.20E-6/(19.300*2.98E-4) m =1.08mm check my work, that seems pretty thick .
*May 28, 2016*

**PHYSICS**

100=distance kicked+distance ran 100=48*cos37*t+v*t but t is time in air. hf=hi+vi*t -16t^2 0=0+48sin37 t-16t^2 0=t(48sin37-16t) t=4sin37 so put that t into the distance equation, solve for v. One wonders why your teacher is not using SI units.
*May 28, 2016*

**Math pronto please help mrs sue**

and you are wrong on both. Why don't you just multiply it out?
*May 27, 2016*

**Probability**

incorrect. Pr(2dimes)=2/8*1/7=2/56=1/23 In reality, because the coins are very different in size, they are not equal probability to draw out.
*May 27, 2016*

**Physics**

current=2.91sin30=.. speed of boat across 2.91cos30
*May 27, 2016*

**Chemistry**

yes, draw them out, and name them. Stick to alkanes.
*May 27, 2016*

**Chemistry**

Depends on the temperature of the solution. At zero C, .455g of lead bromide can be dissolved in 100g water. At 100C, about ten times that can be dissolved.
*May 27, 2016*

**English**

no, I think not. Cyclopes, giants, and louts are hardly civilized. All are strong...
*May 27, 2016*

**U.S. History**

Thoreau supported in writing John Brown in has violent actions at Harpers Ferry, which was hardly peaceful. In his essay Civil Disobedience, I find zero references to only peaceful resistance...but references to any means necessary. One should read the essay itself. Thoreau ...
*May 27, 2016*

**U.S. History**

Well, on 6 I disagree. However, others might agree. There has been in my lifetime a change in the connotation of the word "civil". However, in my understanding of Thoreau, "civil" does not mean peaceful, it meant government. You can do your own reading of ...
*May 27, 2016*

**Chemistry**

fast is a physical entity, it can be measured.
*May 27, 2016*

**MATH ANSWER HELP**

I think you are answer grazing. Lets try this: you give your explaination, and I will comment.
*May 27, 2016*

**math**

.06*Cost=75 Cost=75/.06=not 1175
*May 27, 2016*

**Matt**

outside surface=PI*D*L = PI*3.2cm*5.6cm
*May 26, 2016*

**Math**

x=.3*80
*May 26, 2016*

**Physics**

This is not physics, it is algebra I. 1/rt=1/r1+1/r2 common denominator on right is r1r2 1/rt=r1r2/r1r2 (1/r1+1/r2) 1/rt=(r2+r1)/r1r2 multiply both sides by rt*r1r2/(r1+r2) r1r2/(r1+r2)=rt
*May 26, 2016*

**English**

Raise is better. Lift implies something attached is raising.
*May 26, 2016*

**physics**

Henry
*May 26, 2016*

**physic**

force*distance=pressure*area*distance= 2.40E5Pa*PI( .0125)^2*.3 = ?
*May 26, 2016*

**Math please help pronto**

what is your thinking? z^a * z^b= z^(a+b)
*May 26, 2016*

**Math-Calc**

take the derivative... 2(x^2+y^2+2xy)=25(x^2-y^2) 2(2x dx + 2ydy+2ydx+2xdy=25(2xdx-2ydy) collect the dy terms dy(4y+2x-50y)=dx(-4x-2y+50x) dy/dx= you do it, then put in the point 3,1 and solve for dy/dx
*May 26, 2016*

**Mrs.Sue?**

Balance=2975(1.04)^t after t is what? Put this into your google search engine, with whatever t is supposed to be. 2975(1.04)^t=
*May 26, 2016*

**Math topic part 2**

b = .8a- .2
*May 26, 2016*

**physics**

work=600*4=2400joules power=2400/3 =800 watts
*May 26, 2016*

**physics**

vf=vi+at solve for a.
*May 26, 2016*

**Algebra Plz help :)**

I have no idea what the question is, and I have no idea what link you were following nor why. Please repeat the entire question. Thanks.
*May 26, 2016*

**Quick physics help**

http://www.theguardian.com/notesandqueries/query/0,5753,-19877,00.html
*May 25, 2016*

**math**

A+B=90 x+6+3x-8=90 4x=92 x=23 A=29 B=61
*May 25, 2016*

**Math(PleaseHelp!)**

proof. a+b = sum of even numbers 2(a/2)+2(b/2)= where a/2 and b/2 can be even or odd, or both. 2 ((a/2+b/2) ) has to be an even number, because it is evenly divislble by 2 (note the leading 2). Therefore, the sum of two even numbers is even.
*May 25, 2016*

**Math**

B, D
*May 25, 2016*

**Math**

If the base of the tower is on the same horizontal plane as the point 2m below P, then (h-2)/15= tan65 h=2+15tan65
*May 25, 2016*

**mathh help plsss plsss**

can be solved by factoring. ?? I wonder if your teacher meant "can have real roots". All can be factored, however, if the (b^2-4ac) is negative, the roots are complex, and Difficult to factor, however, they can be solved by factoring. b^2-4ac 36-34...=4
*May 25, 2016*

**Algebra**

(x-19)(x+1)....k=18 (5x+7)^2 k=70 (25x+7)(x+7) k=181, or (25x-7)(x-7) k=-181 (5x+49)(5x+1) k=150 or -150 (25x+49)(x+1) k=74 or -74 (25x+1)(x+49) k=1275 or -1275
*May 25, 2016*

**CHEMISTRY**

.4? That is very acid, very, very acid. Color depends on the specific indicator, but commonly, it will be very red. http://www.gcsescience.com/Indicator-Color-pH-Scale.gif
*May 24, 2016*

**Algebra**

slope of the line: m=(-3-1)/(4+1)=-4/5 slope of the perpendicular (gradient)=5/4
*May 24, 2016*

**science**

sinTheta=n/1.03 n/1.03=.994 n= 1.028 http://www.physicsclassroom.com/class/refrn/Lesson-3/The-Critical-Angle
*May 24, 2016*

**calculus-help.. .Me**

y=e^(-kt)[Acosh(qt)+Bsinh(qt)] y'=-ke^-kt [Acosh(qt)+Bsinh(qt)] +e^-kt[Aqsinh(qt)+Bqcosh(qt) y"=k^2 e^-kt[Acosh(qt)+Bsinh(qt)] -ke^-kt[Aq^2cosh(qt)+Bq^2sinh(qt)]-k^2e^-kt[Aqsinh(qt)+Bqcosh(qt)+e^-kt[Aq^2cosh(qt)+Bq^2sinh(qt) regrouping y'=(q^2-k^2)y-k^2(y')=0
*May 24, 2016*

**Pre-Calc**

cot2x+csc2x= cos2x/sin2x + 1/sin2x= [(1-sin2x)+1]/sin2x [2-sin2x]/sin2x 2csc2x-1= and done
*May 24, 2016*

**Math**

x=y^3+y well, you can use the method of http://www.ms.uky.edu/~corso/teaching/math330/Cardano.pdf
*May 24, 2016*

**Physics**

hf=hi+vi*t-4.8t^2 4.8t^2-22t-30=0 use the quadratic equation to solve for time t.
*May 24, 2016*

**science**

half-life, means statistically, the random events of disintegration half will have occurred on the average in that time. Half life only works when there are many, many particles: when 12 are involved, one cannot predict when six will have disintegrated. The model fails on ...
*May 24, 2016*

**Math**

scale factor; 1331/85184 =1:64
*May 23, 2016*

**Math**

I am not certain I am understanding. If I have it, it went 70km in 3hours speed=70/3=23 km/hr
*May 23, 2016*

**astronomy**

Nope. .83=e^(-.693*t/5730) take ln of each side. ln(.83)=-.693t/5730 t= -5730*ln(.83)/.693=1541years which is about 400 years different than the first answer.
*May 23, 2016*

**Chemistry help asap**

Alkaline buffer solutions An alkaline buffer solution has a pH greater than 7. Alkaline buffer solutions are commonly made from a weak base and one of its salts. A frequently used example is a mixture of ammonia solution and ammonium chloride solution. If these were mixed in ...
*May 23, 2016*

**MATH PLZ HELP**

An number cube is rolled 360 times and the results are recorded as follows:61 ones 26 twos 36 threes 76 fours 73 fives and 88 sixes what is the experimental probability of rolling a 2 or a 3 A. 0.07 B. 0.17 C. 0.26 D. 0.83 I DONT UNDERSTAND THIS ONE! Pr(exp)=Pr(2)+Pr(3)=(26+36...
*May 23, 2016*

**Science - 6th grade**

well, you ignored the air resistance during his forward motion (as he jumps out of the plane). It slows him.
*May 23, 2016*

**Math**

it also could be f(x)=- x^2 The data is not complete enought to make a decision on the function
*May 23, 2016*

**Math**

looks to me: f(x)=x-2
*May 23, 2016*

**Physics**

what happened to vo? it was 6.1m/s, not zero.
*May 23, 2016*

**Math (Vectors)**

theta=arcTan(7.2/5.7) and since it is in the third quadrant, theta=arctan(7.2/5.7) + 180 degrees
*May 23, 2016*

**Geometry**

Euler's Formula For any polyhedron that doesn't intersect itself, the Number of Faces plus the Number of Vertices (corner points) minus the Number of Edges always equals 2 Faces=Edges-Vertices+2 = 24-15+2=11
*May 23, 2016*

**Algebra Please help me :(**

The theoretical probabiliyt for any of the events is 1/2*1/2=1/4 the experimental probability for any trial is the number of successes divided by the trials. Example: TT(50) = 18/50=9/25=.36 Dont forget each outcome is random...
*May 23, 2016*

**Physics**

Pressure=80m* 1.03*9.8 kPa+101.3kpa now in terms of atmosphers, divide that all by 101.3kpa
*May 22, 2016*

**Physics**

pressure=h*1.2*9.8 kpa set that equal to 345kpa, solve for h in meters
*May 22, 2016*

**Math**

73 and 37
*May 22, 2016*

**Algebra**

.02*66+.08*Va=.04(Va+66) solving for Va Va(.08-.04)=66(.04-.02) Va=66(.02)/.04=33 liters so your chart should be... 66 - 0.02 - 1.32 x - 0.08 - .08x 66+x - 0.04 -2.64+.04x Your x is my Vacid Va I am not certain why your teacher is using these charts, most students get lost in ...
*May 22, 2016*

**Algebra**

Ta-940=Tb Ta+Tb=1540 subtract the first equation from the second. Tb+940=1540-Tb 2Tb=600 Tb=300 which implies Ta=1240feet
*May 22, 2016*

**Math (pre-celc 12)**

2x(x-30)(x^2-1) how did you get that from the previous line? Not possible. 2x^4-62x^2+60x Ok, looking for roots. by inspection, x=0, x=1 are roots so, I see 5 as a root, and finally, -6 (2x(x+6)(x-5)(x-1))
*May 22, 2016*

**Physics**

I assume that is gauge pressure, not absolute. weight of a column of water h high with diameter of 1m^2: weight=h*1*1E3kg/m^3*9.8N/kg pressure from that (weight /area) pressure=h*1E3*9.8 N/m^2=9.8h kPa 252kPa=9.8 kPa * h h=252/9.8 meters
*May 22, 2016*

**Pharm**

750ml/1.5hr= rateperhour
*May 22, 2016*

**Chemistry**

2HNO3+Mg(OH)2>>Mg(NO3)2 + 2 H2O so you need 1/2 mole magnesium hydroxide for each mole of nitric acid. MoleNitricAcid=.385*2.5*(molmassNitricacid) = .385*2.5*63 MassMg(OH)2=above/2 * molmassMgOH2 = above/2 * 58.3 grams
*May 22, 2016*

**cfgcfhbcncf**

volume=flowrate*area*time 50*44*.7 m^3=5000m/hr*PI (.7/2)^2 *time solve for time time=50*44*.7/(5000*PI*(.7/2)^2) hr
*May 22, 2016*

**math**

less than three is a one, or two. pr=1/2 * 1/6 + 1/2 * 1/6= 1/6 or is a word that indicates add the probabilities of each.
*May 21, 2016*

**Math**

ok, the three rectangles run at x=1, 2, 3 for the left endponits, at y=x^.5 the width is 1, so the area is 1*x^.5 areas: first 1-2, area=1*1^.5 left endpoint second 2-3, area=1*2^.5 third 3-4, area=1*3^.5 so the sum of areas is 1+sqrt2 + sqrt3
*May 21, 2016*

**Physics**

weight car=pressure*area*4tires pressure=1350*9.8/(.15*.13*4)Pascals now if you want to change from pascals to psi, pressurePascals*0.000145 psi
*May 21, 2016*

**Chemistry**

well, which is more? 2*5/4 ? 16/32 10/4 ? .5 2.5>.5 so H2 is far in excess.
*May 21, 2016*

**chemistry**

actually, no. M(OH)2 it means you have two hydroxide ions, consisting of 2 O atoms, and 2 H atoms, which are bonded as OH- in a covalent bond, a rather strong bond.
*May 21, 2016*

**Hisyory**

I have one comment on Mr Moore's blog on Aristotle, and it is in reference to <<Students sometimes use the theories and equations without understanding how they were developed, their limitations, or even what problems they address. The development of an idea from ...
*May 21, 2016*

**ordinary differential equation**

see solution 3 http://www.math.cmu.edu/~doffner/teaching/122/quiz7sol.pdf
*May 21, 2016*

**mathematics**

100=45+85-both both=30 which means biology only is 85-30
*May 21, 2016*

**chemistry**

CO2+Na2CO3 + H2O>>2NaHCO3
*May 21, 2016*

**Science**

an answer key. Or a magic 8 ball. or the I Ching.
*May 21, 2016*

**math**

well,then cotX=-3/4 or cotx-1 which means X=arcTan(-4/3) is in quad II or IV = 90+53.13, or 360-53.13 deg if cotx=1, then tanx=1, so x is in quad I or III x=45deg,or 180+45deg
*May 21, 2016*

**math - analytic geometry**

see other post
*May 21, 2016*

**analytic geometry**

http://www.purplemath.com/modules/ellipse.htm if the distances from the two foci are constant, then it is an ellipse, center at 0,0, Consider the point on the x axis x=5, the sum of distances to the foci is 10, so a=5, c=3, and b=sqrt(a^2-c^2)=4, so now you have all the ...
*May 21, 2016*

**Pharmacy (Specific gravity of mixtures)**

you want this basic algebra equation (first change pint to 483ml) 483ml*1.20+V*1.20+500*1=(V+483+500)1.15 solve for V of additional ml of glycol. V(1.20-1 )=1.15(983)-1.2(483)-500 V=I get 254ml check that.
*May 20, 2016*

**BOB PURSLEY PLEASE HELP**

Fq=.55*sinTheta Fg=.55*cosTheta first q: F=kqq/r^2=... http://hyperphysics.phy-astr.gsu.edu/hbase/electric/elefor.html
*May 20, 2016*

**math**

b is definitely wrong.
*May 20, 2016*

**Global Communicaiton Studies**

Psychology Wiki On the Wiki Wiki Activity Random page Videos Images TopContent community Contribute Watchlist Random page Recent changes Sociocultural factors 34,200pages on this wiki Edit Talk0 Assessment | Biopsychology | Comparative | Cognitive | Developmental | Language...
*May 20, 2016*

**MATH REPOST**

quadrant II
*May 20, 2016*

**math**

3/4 * 3 1/2= 3/4 * 7/2= 21/8= 2 5/8 Cups
*May 20, 2016*

**chem.**

Assuming NaI is the limiting reactant, so mass of PbI2 .. moles NaI=.7*.240=0.168moles, which means .168*2 moles of PbI2, so convert that to mass. mass=.168*2*(461) grams.
*May 20, 2016*

**Physics**

lAW OF INERTIA: An clark which is not in motion, will stay not in motion until a force acts on it. the train moved, clark did not. Claudette moved also, right underneath Clark.
*May 20, 2016*

**pre algebra**

I assume white means negative x^2-2x+3x-4+1= x^2+x-3
*May 20, 2016*

**physics**

A and C. Pythagorean theorem
*May 20, 2016*