Sunday

May 29, 2016
Total # Posts: 26,282

**algerbra 2**

4 - x so?
*January 6, 2016*

**Math**

the total passing speed is 180 km/hr the distance is 600 m = 0.6 km so t = d/s = .6 /180 = 1/300 hour (1 hr/300) * 3600 s /hr = 12 seconds
*January 6, 2016*

**Math**

They want minutes so do it all in minutes 4 seconds = 4/60 = 1/15 minute half hour = 30 minutes 30 = 4 + (1/15) t 26 * 15 = t t = 390 minutes (which is 6.5 hours)
*January 6, 2016*

**Subject-verb agreement**

I agree on A and D You are right I suppose about measles in theory but surely you would say: "Measles spreads". Although C may be correct, I object. In fact, physics is easy to learn.
*January 6, 2016*

**Math**

A = 1/8 job/day B = 1/4 job/day A + B = 3/8 job /day which is 8/3 days per job (8 days/3 jobs) 10 Hours/day = 80/3 hours/job = 26 2/3 hours
*January 6, 2016*

**Math**

multiply 1.2 * 1.1 = 1.32 so the price increased a total of 32 percent. 6600/1.32 = ?
*January 6, 2016*

**Math**

A * 1.2 = B A * 1.2 * 1.1 = C = 6600 so A = 6600/(1.2*1.1)
*January 6, 2016*

**Math**

after the first spending spree he has 0.85 M left then he wanders into the horse track and spends 0.6 of that so he has 0.85 M * 0.4 = 4080 M = 4080/(.4*.85) = 12,000
*January 6, 2016*

**Oh come on**

You are asking us to help and have not even tried? All of us here have already passed the subject. We do not need practice taking percentages. Please post your attempts. Do not expect us to just do homework or exams for you.
*January 6, 2016*

**Physics**

(1/2)mv^2 = .5 (0.500)(300)(300) J
*January 6, 2016*

**ELA/Social Studies**

Well, what position do you intend to apply for? You are applying. I am not applying. Let's see your work first. I bet someone here would be willing to help at that time.
*January 6, 2016*

**Social Studies**

General MacArthur ? http://history.state.gov/milestones/1945-1952/japan-reconstruction
*January 5, 2016*

**Algebra 1**

http://www.jiskha.com/display.cgi?id=1452020437 Start trying to do them and stop asking us to do it all.
*January 5, 2016*

**Algebra 1**

Henry and I have both done this already, scroll down.
*January 5, 2016*

**Algebra 1**

Yes, but no need to ask is there?
*January 5, 2016*

**Algebra 1**

to eliminate y, multiply the first equation by 5 and the second equation by 3: 20 x + 15 y = 60 21 x + 15 y = 78 --------------------subtract -1 x = - 18 so x = 18 so 4(18) + 3 y = 12 72 + 3 y = 12 3 y = -60 y = -20 ----------------------- check that to be sure 7(18) + 5 (-20...
*January 5, 2016*

**Algebra 1**

4x-y=23 7x+y=21 ------------so add instead to eliminate y 11 x = 44 x = 4 well that is better 7(4) + y = 21 28 + y = 21 y = -7
*January 5, 2016*

**Algebra 1**

4x-y=23 7x-y=21 ------------subtract to eliminate y -3x =2 x = -2/3 I suspect that you have a typo
*January 5, 2016*

**History**

What is due south of Florida's capital city ? :)
*January 5, 2016*

**History**

Look at a map ! East of East Florida is the Gulf stream, the bleak Atlantic, then Africa
*January 5, 2016*

**Algebra 1**

It tells you to use substitution and you already have y, all alone on the left. It is (-3x+6) so use that. substitute it for x i the other (first) equation 4 x + 2(-3x+6) = 10 4 x - 6 x + 12 = 10 2 x = 2 x = 1 y = -3(1) + 6 = 3
*January 5, 2016*

**Math: Ratio**

4/3 = b/g so b = 4 g/3 4/5 = (b-160)/g or 4 g = 5 (4g/3 - 160) 4 g = 20 g/3 - 800 12 g = 20 g - 2400 so 8 g = 2400 g = 300
*January 5, 2016*

**MATHEMATICS**

Look at this to see how: http://www.jiskha.com/display.cgi?id=1279831346
*January 5, 2016*

**algebra TYPO**

(1/sin)(1/sin-sin)+ sin-cos/sin+cos/sin You have no = sign I suspect also careless parentheses
*January 5, 2016*

**math**

L + w = 24 20 + 4 19 + 5 18 + 6 17 + 7 16 + 8 15 + 9 14 + 10 13 + 11 12 + 12 seems to be nine
*January 5, 2016*

**math**

a*1000 + b*100 + c*10 + d a = 2c c = b-1 b = 5 then c = 4 and a = 8 so 8,54d You said nothing about the ones digit.
*January 5, 2016*

**math**

the inside rectangle area is 35*17 the outside rectangle area is 40*22 subtract the inside from the outside.
*January 5, 2016*

**algebra**

(4/3) pi r^3
*January 5, 2016*

**Math**

(x/4 ) *4 = (-5) *4 so x = -20
*January 5, 2016*

**Algebra 1**

Exactly
*January 4, 2016*

**Algebra 1**

Yes, but figure out why.
*January 4, 2016*

**Algebra 1**

terry = 15 + 10 t susan = 9 + 12 t so 15 + 10 t = 9 + 12 t 2 t = 6 t = 3 hours
*January 4, 2016*

**math**

You should get; 1 0 5 0 1 -2
*January 4, 2016*

**math**

http://www.gregthatcher.com/Mathematics/GaussJordan.aspx
*January 4, 2016*

**math**

+7 -3 41 +2 +5 00
*January 4, 2016*

**j**

turn IN line
*January 4, 2016*

**Algebra 1**

graph the line w = 190 - L everything under and including that is shaded graph the line L </= 110 it is horizontal or vertical depending on which axis you chose for width everything left or under that is shaded where the two shadings unite, that is your region.
*January 4, 2016*

**Algebra 1**

the sum of the width and length can be no more than half of 380 the length must be at least 110
*January 4, 2016*

**Algebra 1**

perimeter = 2 w + 2 L </= 380 so w + L </= 190 and L >/= 110
*January 4, 2016*

**U.S. History**

I read it wrong. God with Reed !
*January 4, 2016*

**U.S. History**

I agree
*January 4, 2016*

**English**

Absolutely c !
*January 4, 2016*

**Algebra 1**

You are welcome. note this time it does not include the line itself whereas the earlier one was greater than AND equal to
*January 4, 2016*

**Algebra 1**

No constant y is a HORIZONTAL line everything below y = -2
*January 4, 2016*

**Algebra 1**

everything on and to the right of the vertical line x = 3
*January 4, 2016*

**U.S. History**

I would have picked C
*January 4, 2016*

**U.S. History**

I would have picked Sam Adams. Most of us think of Lexington and Concord as the opening volley of the war.
*January 4, 2016*

**Math**

say each eats one pound per day :) I have 21 * 24 = 504 pounds now I have 21 + 15 = 36 people or 36 lb/day 504 pounds/36 lbs/day = 14 days
*January 4, 2016*

**math**

n = d + 43 (d - 17) = .5 n or d = .5 n + 17 so n = .5 n + 17 + 43 .5 n = 60 n = 120 d = n-43 = 77 that is at the start but he spent 17 dimes so 120 + 60 = 180 coins left
*January 4, 2016*

**Algebra 1**

You are welcome.
*January 4, 2016*

**Algebra 1**

2 (4x+3) - 8 x = 3 8 x + 6 - 8 x = 3 0 x = - 3 oh my, division by zero try y = 4x + 3 and y = 4x + 3/2 ah, we have a problem here two parallel lines, same slope but different y axis intercepts They never touch each other, ever/ NO SOLUTION
*January 4, 2016*

**Algebra 1**

x = +5 y + 3 x = -5 y + 3 -----------------add 2 x = 6 x = 3 then y = 0 they cross at (3,0)
*January 4, 2016*

**Science -- Check my Answer Plz (again)**

Now we have a heat capacity question mass of 50 mL = 50 grams change in temp = 10 degrees C specific heat capacity of water = 1 cal/gram deg C so heat in = 1 cal/g C * 50 g * 10 C = 500 Calories = 5 * 10^2 Calories
*January 4, 2016*

**Algebra 1**

LOL - You are welcome.
*January 4, 2016*

**Algebra 1**

19/2 = 9.5 !!!!
*January 4, 2016*

**Algebra 1**

( -2 , -19/2 ) ?
*January 4, 2016*

**Algebra 1**

Now you try. I did the last one.
*January 4, 2016*

**Algebra 1**

-x+2=3x-1 4x = 3 x = .75 then y = 1.25 so ( .75 , 1.25 )
*January 4, 2016*

**Science -- Check my Answer Plz**

you had typed 540*10^4 it should be 5.40 * 10^4
*January 4, 2016*

**Science -- Check my Answer Plz**

You will need 540 calories per gram water is 1 mL or 1 cm^3 per gram so I get 540 * 100 csl which is 5.40 * 10^4 cal I hope B is a typo and should be 5.40*10^4
*January 4, 2016*

**Science -- Explaination on Heat Capacity?**

You are welcome, good luck.
*January 4, 2016*

**Science -- Explaination on Heat Capacity?**

Oh my, you question is not about heat capacity but about the latent heat of fusion of water. to melt one gram of ice at 0 deg C requires 224 Joules or 79.8 Calories so to melt 10 grams requires 2240 Joules or 798 calories (so pick 800) specific heat capacity is when there is a...
*January 4, 2016*

**Math**

number of spots for players over the season = 42 * 9 = 378 378/14 = 27 games for each player
*January 4, 2016*

**math**

of course now that you mention it, adding a number to itself is kind of like multiplying it by two if it were six instead of five 6+6 = 12 2*6 = 12
*January 4, 2016*

**math**

2 n = n + 5 ? n = 5
*January 4, 2016*

**Geometry (again)**

You could maybe see if a^2+a^2 = c^2 or in the trapezoid if the two diagonals are equal
*January 4, 2016*

**Algebra**

T(t)= 12 + 3 (t-7)
*January 4, 2016*

**Rational Numbers**

Well done !
*January 4, 2016*

**Rational Numbers**

You are welcome.
*January 4, 2016*

**Rational Numbers**

A. Sometimes 22/7 is used for pi HOWEVER it is only an approximation. There are no two whole numbers you can divide and get pi. pi is therefore IRRATIONAL B no way, irrational C no way, irrational D 4/3 YES, finally
*January 4, 2016*

**U.S. History**

.... and now ?
*January 4, 2016*

**Math**

let u = sin x so du/dx = cos x y = cos^-1 (u) dy/dx = - [1/(1-u^2)^.5 ] du/dx = -[ 1/cos x] cos x = -1 we agree
*January 4, 2016*

**math**

540/27 = 20
*January 4, 2016*

**physics**

bullet mass + wood mass = 2.107 kg potential energy if up 0.4 meter: I assume this is along the circumference so .4 = theta * 2 = theta = .2 radians = 11.5 degrees distance up from bottom = 2 (1-cos theta) = .0803 meters so energy at top = m g h =2.107*9.81*.0803 = 1.66 Joules...
*January 4, 2016*

**Math Complicated**

You are welcome.
*January 4, 2016*

**Math Complicated**

Yes, you have it :)
*January 4, 2016*

**Math**

(24/48)(x^4/x^2) (y^2/y) (1/2) x^2 y
*January 4, 2016*

**physics**

vertical problem: v = Vi - 9.81 t v = 0 at the top t = Vi/9.81 at the top which is 100 meters h = Vi t - 4.9 t^2 100 = Vi^2/9.81 - .5*9.81 (Vi^2/9.81^2) 100 = .5Vi^2/9.81 Vi = 44.3 m/s T = angle up from horizontal sin T = 44.3/50 T = 62.4 degrees t = 2 * Vi/9.81 = 2*44.3/9.81...
*January 4, 2016*

**US History**

nope: http://www.dummies.com/how-to/content/what-is-the-presidents-cabinet.html
*January 4, 2016*

**Science**

I agree with YRN on all others
*January 4, 2016*

**Science**

5 is C
*January 4, 2016*

**Science**

Al is 27 g/mol so we have 3 * (13.5/27) * 6 *10^23 electrons lost
*January 4, 2016*

**Science**

M = metal we have MCl2 1 mol chlorine and 1/2 mol of metal 35.5 g chlorine in a mol 111 - 35.5 = 75.5 g of M so M is 75.5 * 2 = 151 g/mol maybe Europium
*January 4, 2016*

**Physic**

sorry, no it is ok well, for a plane wave d^2y/dx^2 must be (1/v^2)d^2y/dt^2 if y = x^2 + v^2 t^2 dy/dx = 2x d^2y/dx^2 = 2 dy/dt = 2 v^2 t d^2y/dt^2 = 2 v^2 2 = (1/v^2) 2 v^2
*January 4, 2016*

**Physic**

well, for a plane wave d^2y/dx^2 must be (1/v^2)d^2y/dt^2 if y = x^2 + v^2 t^2 dy/dx = 2x d^2y/dx^2 = 2 dy/dt = 2 v^2 t d^2y/dt^2 = 2 v^2 so it is not and you should have written x^2 + (1/v^2) t^2
*January 4, 2016*

**Science**

http://hyperphysics.phy-astr.gsu.edu/hbase/electric/restmp.html
*January 4, 2016*

**physics**

west momentum = 1500 * 90 north momentum = 1400 * 72 final west momentum = 2900 Vwest final north momentum = 2900 Vnorth final = initial speed = sqrt(Vwest^2 + Vnorth^2) tan angle west of north = Vwest/Vnorth
*January 4, 2016*

**Math**

upstream speed = u - c downstream speed = u + c d = (u-c)(3.5) = (u+c)(2.1) but c = 3 so (u-3)(3.5)=(u+3)(2.1) 3.5 u - 10.5 = 2.1 u + 6.3 1.4 u = 16.8
*January 4, 2016*

**Another Calculus help plz**

I do not know if you mean tan (x/2) or (1/2) tan x Parentheses are important. I will just do y = tan x = sin x / cos x perhaps that will get you going. dy/dx = (cos^2 x + sin^2 x)/cos^2 x = 1/cos^2 x
*January 4, 2016*

**Calculus help plz**

cos^2 mx dx ? = mx/2 + sin(2mx) / 2m
*January 4, 2016*

**Math**

22.05 = 1960 (r/4) 1960 r = 88.20 r = .045 so 4.5 %
*January 4, 2016*

**Math**

3 * .04 * 820
*January 3, 2016*

**Math**

.75 * 52
*January 3, 2016*

**Science (Mrs.sue please help)**

Yes.
*January 3, 2016*

**Need the picture**

Without the picture there is not much hope of help.
*January 3, 2016*

**Algebra**

slope of zero means constant y (4,9) and (3,9) and calling the second coordinate x is presumably done to confuse the student.
*January 3, 2016*

**Physic - ah got it !**

http://www.thefreedictionary.com/physic
*January 3, 2016*

**Physic**

By the way is a physic something you take for a stomach ache?
*January 3, 2016*

**Physic**

work = force in the direction of motion * distance normal force down = weight - tension component up = m g - F sin 23 friction force = .33(mg-F sin 23) drag force = F cos 23 no accelration so friction force = drag force F cos 23 = .33 (mg-F sin 23) solve for F we want the ...
*January 3, 2016*