# Posts by Damon

Total # Posts: 30,061

**Math**

-4 (4) < 4x < 5(4) -16 < 4x < 20 -16 + 5 < 4x+5 < 20 + 5 -11 < 4x+5 < 25

**Math**

proof read perhaps 30% of x is 87 ? .3 x = 87 x = 87/.3 = 870/3

**Chemistry**

heat comes out when you convert water to ice

**physics!**

Ac = v^2/R = omega^2 R well circumference = 2 pi R = 22.6 pi meters does that circumference in 16.6 seconds so v = 22.6 pi/16.6 meters/second so Ac = (22 pi/16.6)^2 / 11.3 the mass has nothing to do with it unless you want the tension in a string :)

**Physics**

leg of right triangle 5^2 + x^2 = 169 x^2 = 144 x = 12 this is a 5, 12, 13 right triangle

**Accelerated Math**

c = 7 s c depends on s

**math**

0.80 p = 65 p = 65/.8 = 650/8

**math**

(568+102-57) * 1.10 =

**All subjects**

EXPRESS all lengths in METERS, not cm for example I do not believe your well is radius of 3 cm Volume of well = V = pi r^2 * 21 Q = flow rate Q = width * depth * 2 m/s V = flow rate Q * time t

**Chemistry**

humm 2H2 + O2 ---> 2H2O O is 16 g/mol so O2 is 32 grams/mol so we have 384/32 = 12 mols of O2 That will yield 2*12 = 24 mols of H2O a mol of H2O is 2+16 = 18 grams/mol so 24 mols = 24*18 = 432 grams water

**calculus**

F = k x 4 = k (.1) k = 40 pounds/foot Energy = Work = (1/2) k x^2 = (1/2)(40)(.6)^2 foot pounds to get that with calculus work in = F dx = k x dx = k x^2/2 + constant if W = 0 when x = 0 than the constant is 0 so W = (1/2) k x^2

**Physics**

the wavelength is determined by the difference between high and low energy levels in the material emitting the photons.

**Hope someone know this Math**

The original reply that the terms are irrational is rational.

**Math - Calculus**

only if it is horizontal there. http://www.google.com/search?q=critical+point+of+function&ie=utf-8&oe=utf-8

**Math**

but I think you wanted GREEN (9/14) (70) = 45

**Math**

now try that 25/70 = ? 5/14 whew !!!

**Math**

another way multiply both sidees of this equation by the least common multiple of 14 and 70 I think 140 is close enough 140(5/14) = 140(x/70) 10 * 5 = 2 * x 5 * 5 = x 25 = x

**math**

yes

**math**

The area is four times the original and no I am retired.

**math**

double the scale of a two dimensional figure and area is multiplied by 2^2 = 4 times eg rectangle 2 x * 2 y = 2^2 x y = 4 x y

**Math**

multiply both sides by 100x 5 x = 300 x = 60 now try that 3/60 = 30/600 = 5/100 yes

**Math**

that makes NO SENSE. You have no unknown there and it is wrong anyway 5/100 = 0.05 30/6 = 5 they are not the same you must have an x somewhere

**Math**

your second problem statement makes no sense.

**Math**

multiply both sides by 100 x 100 x (3/100) = 100 x (30/x) 3 x = 3,000 x = 1,000 or simply multiply the left side by 10/10 30/1,000 = 30/x :)

**PE**

That is correct if your order is from simple to complex. The original question was from complex to simple

**PE**

most complex ---> simplest systems -> organs->tissues->cells

**PE**

ah, most complex is supposed to be first I think.

**math**

the area of a trapezoid is the average length of top and bottom (L1+L2)/2 times the height http://www.google.com/search?q=area+of+trapezoid&ie=utf-8&oe=utf-8

**Physics**

q * E charge times electrical field strength proportional to charge

**Physics**

k Q1 Q2 / d^2 charge and distance

**Physics**

no

**Algebra2**

(x-0)^2 = 4a(y-0) a = distance vertex to focus or to directrix if a is +, parabola holds water here directrix is below vertex, so a is +5 x^2 = 20 y

**Chemistry**

.055*.5 = .0275 mols of H2CO3 You need half as many mols of Fe2SiO4 .5*.0275 = .01375 mols now add up gram molecular mass of Fe+Fe+Si+16+16+16+16 to get grams/mol and multiply by .01375 to get grams

**Physics**

yes

**Physics**

http://en.wikipedia.org/wiki/Interference_(wave_propagation) note: [2A] cos (kx- wt) cos(phase angle/2)

**math**

By up I suppose you mean up in y because you have no z coordinate. Just increase all the y locations by 3 and leave the x coordinates the same. eg: S(4,4)

**no idea**

do not see picture

**physics**

Spaceship 2 has it all:) 300*0 = 0 300*4 = 1,200 kg m/s

**physics, vectors**

If a unit vector in the x or east direction is i, the y direction or north is j, and the z direction or up is k, then: momentum vector=12,000 i + 0 j + 0 k magnitude = sqrt (12,000^2+0^2+0^2) =12,000 kg m/s

**Physics**

200(1.5) = .5 w w = 600 Newtons

**incomplete**

What is the question? a = (13.4-0)/5 m/s^2 = r*alpha v = 0 + a t = r*omega d = 0 + 0t + (1/2)(5)t^2

**Hot math questions**

LOL :)

**English**

well, "he" is a person :) Had got no business to be there After the day was done — "It's very rude of him," she said, "To come and spoil the fun." So who does she think the night belongs to?

**Algebra math 150**

height times average of a and b

**Physics**

The increase in gravitational potential energy = m g h where h is the HEIGHT change, the increase in distance from the center of the earth. Work = distance times force IN THE DIRECTION OF MOTION 200 * 4 = 800 Joules alternatively force component up slope * 4/sin 20 = 200 sin ...

**math 1**

when you typed 1/3x + 4 I assume you mean (1/3)x + 4 and not 1/(3x) + 4 or 1/(3x+4) y = (8-x) so (8-x) = (1/3) x + 4 24 - 3 x = x + 12 4 x = 12 x = 3

**Math**

a = 3 m b = 8 m c = 6b = 48 m a/c = 3 m/ 48 m = 1/16

**Chemistry**

(a) but when she opens the bottle the air inside is still at 1 atm so must escape out the open top--> whoosh !

**math 73**

.22 c + .02 m = .04(20) c + m = 20 so m = (20-c) so .22 c +.02(20-c) = .8

**Physics**

omega is angular velocity in radians/second omega R = 5 m/s so omega = 5/.3 = 16.7 radians/second Ke = (1/2)I omega^2

**Math**

You are welcome.

**Math**

Make a number line on a piece of paper. Draw the situation on it. Left 8 from -20 -20-8 = -28

**you need limits**

infinite as stated

**Calculus**

assuming that your answer is correct dy/dx = x^2 e^(x^3/3) but e^(x^3/3) = y-2 so dy/dx = x^2 (y-2) hummm I'll try dy/(y-1) = x^2 dx ln(y-1)= x^3/3 + c (y-1) = e^[x^3/3 + c] y-1 = e^(x^3/3) e^c y-1 = Ce^(x^3/3) y = 1 + Ce^(x^3/3) 3 = 1 + C C = 2 so y = 1 + 2e^(x^3/3)

**Science**

1. wrong 2. right 3. wrong 4. both mass and distance G M1M2/d^2 5. both (or they would bash each other) 6. right 7. It is near the poles that you have darkness at noon when the sun is above the other Capricorn or Cancer :) 8.Right 9. WRONG!!!! (google moon landing) 10. Wrong...

**English**

Nope. None of them are.

**Social studies**

Nope, remember that 3/5 of a person thing?

**Math**

(1/4) 16 = 4 lettuce (1/8) 16 = 2 punpkin (1/2) 16 = 8 red tulips 4+2+8 = 14 16-14 = 2 rows of carrots

**math**

recursive means you get the value from an earlier value or values. An+1 = An + 5 for example Explicit means you calculate it without reference to the former value A = 5 n for example

**Math**

x = 4 y = -2 what more can I say?

**Science**

meters (not kilograms or seconds)

**Calculus**

Nah, I carried an incorrect extra x

**Calculus**

10 x-3xdy/dx-y(3x)=6y^2 dy/dx (6y^2+3x)dy/dx = 10 x -3xy dy/dx = (10x-3xy)/(6y^2+3x)

**social studies**

I am trying to calm down and go back to the calculus question.

**social studies**

http://www.abrahamlincolnonline.org/lincoln/speeches/gettysburg.htm

**social studies**

For heaven's sake Google ! READ THE ADDRESS @!

**Maths**

3 * 7 = 21

**physics**

(1/2) m v^2 = m g h so v = sqrt (2 g h) g = 9.81 m/s^2 h = 30 m

**value**

m g h/t

**Physics**

well first the 2 ohm resistor Vtwo = i R = 1.2*2 = 2.4 volts Now the two in parallel They are both at voltage V V = i1 (6) = i2 (18) but we know i1+i2 = 1.2 so i1 = 1.2 - i2 6(1.2- i2)=18 i2 7.2 = 24 i2 i2 = 7.2/24 = .3 amps through 18 ohm i1 = 1.2 - .3 = 0.9 amps through 6 ...

**History**

North American white pine for spars.

**History**

Archimedes screw pump, capstan, windlass, aft rudder on pintles with wheel, deadeyes and lanyards .....

**History**

LOL, could go on for hours. steam boxes for plank bending. oakum, pitch pine, eventually copper bottom paint

**History**

white oak frames and planking and locust trunnels (tree nails)

**History**

eat limes "Lime-juicers" avoid scurvy

**History**

Navigation technology (determination of longitude)

**Math**

divide by density, not number of people (50/750)100 = 6.67 %

**physics**

1.05*10^5 * .12*.18 = ---- kilograms now it is not clear if that is one of four tires if so then multiply by 4 I wonder because around 2,000 kg is reasonable for a car and four times that is pretty heavy.

**Science**

Venus is volcanic so I suppose you would call hardened lava rocky.

**Math Trig**

d1^2 = 225-100 = 125 d2^2 = 225 - 64 distance between = d1+d2 add because the walls are in front of and in back of the fireman:)

**Science**

Now wait a minute, what do you think dew point means? It is the point where there is so much water in the air that the air can not hold any more at that temperature. That means the relative humidity is 100%

**math**

A bag contains 2 white marbles amd 3 green marbles. Two marbles are drawn at random, one after the other. The first marble is replaced before the second one is drawn. What is the probability that the first marble is green and second one is white?

**Health**

Now you are getting beyond my knowledge of the subject but I think you are correct. The other answers do not make sense.

**Health**

You are welcome.

**Health**

I agree with your answers

**Math**

L = w + 8 (L-5 )(w+4) = L w (w+8-5)(w+4) = (w+8)w (w+3)(w+4) = w^2 + 8 w w^2 + 7 w + 12 = w^2 + 8 w w = 12 etc

**Math**

x + y = 60 .4 x + .9 y = .75 (60)

**Math**

4 1/4 - 3/4 the easy way is 3 5/4 - 3/4 = 3 2/4 = 3 1/2 however if your were into making live hard for yourself you could 4 1/4 - 3/4 = 4-2/4 = 4 -1/2 = 3 1/2

**Math**

well because it is awkward to subtract 3/4 from 1/4 You could do it and work with the negative fraction but it is easier to say: 4 1/4 = 3 5/4 then it is easy

**Math**

You sure need a big calculator but I would settle for 3.14159 (88.3773)^2 because I do not remember pi any further than that.

**math**

Your teacher asks tricky questions :)

**math**

6 * 4 = 24 so 24 dollars for every bag of 7 apples 120/24 = 5 bags of 7 apples you got one free in each bag, so 5 free 5*7 = 35 apples total friend bought 21/7 = 3 bags for $24 each. 3 * 24 = 72 dollars $4 for an apple is ridiculous

**TEAS 6 MOMETRIX**

alternative to that which is called "elimination" is "substitution" from the second equation x + y = 5.90/2 = 2.95 so you can say x = 2.95-y now use that in the first equation 4(2.95-y) + 3 y = 9.55 11.80 - 4y + 3 y = 9.55 y = 11.80 -9.55 = 2.25 again

**TEAS 6 MOMETRIX**

4 x + 3 y = 9.55 now multiply your second equation by 2 4 x + 4 y = 11.80 subtract the first equation from the second 0 x + 1 y = 11.80-9.55 = 2.25 the end

**Huh**

I have no idea what your problem looks like. LS 154 means something to you somewhere, not to me on Massachusetts Bay.

**math**

I got 14 13 + 10 + 9 + 9 = 41 41 - 27 = 14 25/2 = 13 17/2 = 9 for two seaters

**math**

No fair, can not cut two person desk in half :) Please check my reply below.

**math**

then subtract the 27 you have and buy 14

**math**

13 + 10 + 9 + 9 needed

**math**

No, 25/2 is not a two person desk need 13 desks for 25 people and 9 desks for 17 people TRICK QUESTION :)