Friday

April 29, 2016
Total # Posts: 26,093

**math**

10.5 km/cm which is 1,050,000/1
*December 22, 2015*

**math**

385 ( 1 in/25 mi) = 15.4 in
*December 22, 2015*

**Huh?**

How would I know? I have no idea what a or d is.
*December 22, 2015*

**math**

I have no ideas because I do not know the shape or the scale
*December 22, 2015*

**math**

6 ft (9.6/12) = 4.8 ft
*December 22, 2015*

**science**

CaO + 2HNO3 ---> H2O + Ca(NO3)2 ?? CaO = 40 + 16 = 56 grams/mol so we have 1.5/56 = .0268 mols of CaO
*December 22, 2015*

**science help**

You need a good storage system so you can provide energy left over from the windy days on the calm days. (super batteries, pump up to a reservoir, flywheels, whatever.
*December 21, 2015*

**science help**

Yes of course. The others are nutty.
*December 21, 2015*

**science help**

I have no idea what your experiment was.
*December 21, 2015*

**science help**

yes
*December 21, 2015*

**science help**

Oh come on, If you squeeze it together it gets denser If you release the pressure it expands and gets less dense
*December 21, 2015*

**math help pls pls**

3x + 2 y = 27 2 x + y = 27-11 = 16 ================= The student's conclusion is correct because the solution to the system of equations 3x + 2y = 27 and 2x + y = 16 is (5, 6). C
*December 21, 2015*

**math help pls pls**

Now I did the other one. You do this one.
*December 21, 2015*

**pharmacy tech**

.01 x + .05(30 - x) = .03 (30)
*December 21, 2015*

**world civilizations II**

I vote for a) ( Poland , Russia)
*December 21, 2015*

**math help pls pls**

by the way, now that we know, we go back and see why They will have the same solution because the first equation of System B is obtained by adding the first equation of System A to 4 times the second equation of System A.
*December 21, 2015*

**math help pls pls**

GRAPH THEM ALL !!! I tend to put them in the slope intercept form y = m x + b to graph them System A first 6x + y = 2 or y = - 6 x + 2 second −x − y = −3 or y = -1 x + 3 now I can easily graph them where do they cross? -6x+2 = -1 x + 3 5 x =-1 x = -1/5 so ...
*December 21, 2015*

**Physics**

i = V/R = 6/3 = 2 amps in parallel, currents add in series, voltages add
*December 21, 2015*

**MATH HELP**

whew, you had me worried there.
*December 21, 2015*

**MATH HELP**

I guess you will have to check your text book :)
*December 21, 2015*

**MATH HELP**

y = x/2 -3 and y = x/2 -5 two parallel lines with the same slope but different y axis intercepts therefore they never, ever, cross and there is no solution
*December 21, 2015*

**Math**

http://davidmlane.com/normal.html
*December 21, 2015*

**History [Check?]**

Stalin? Free elections ????
*December 21, 2015*

**our own English school**

That certainly would be a good start :)
*December 21, 2015*

**Algebra**

more than -5 and less than +5 -5 < x < +5 line between x = -5 and +5 less than -5 or more than +5 -5 > x > +5 line left of -5, skip -5 to + 5 and line right of +5
*December 21, 2015*

**Algebra**

0 </= x < 8
*December 21, 2015*

**physics**

The 2 kg hanging block: x defined down m a = m g - T T = m (g-a) T = 2 (9.81-a) The 3 kg bock on the slope: now x is up the slope T - m g sin 30 = m a T = m (g/2+a) T = 3 (4.9-a) your turn.
*December 21, 2015*

**khalsa model senior secondary school**

http://www.jiskha.com/display.cgi?id=1450703655#1450703655.1450708788
*December 21, 2015*

**physics**

Check the questions and answers below for hints. For example: http://www.jiskha.com/display.cgi?id=1328161975
*December 21, 2015*

**Physics**

Agree if the battery is dead BUT If the circuit is open the voltage is whatever the battery was charged to. If the circuit is "shot circuited", the terminals connected by a thick wire of zero resistance, the current becomes infinite and the voltage zero V = i R V = i...
*December 21, 2015*

**Physics projectile motion**

Click on some of the earlier problems below, for example: http://www.jiskha.com/display.cgi?id=1383313306
*December 20, 2015*

**physics**

g is -9.8 if up is positive The only time I did not use - is when the thing was falling. I knew I had - on both sides. I could have written - (h +19.6) = - 4.9 t^2 because it goes DOWN that distance with a negative acceleration starting at the tip top of its path.
*December 20, 2015*

**physics**

v = Vi - 9.81 t v = 0 at top so 0 = Vi - 9.81*2 Vi = 19.6 m/s up h = Vi t - 4.9 t^2 = 19.6(2) - 4.9(4) = 19.6 meters above roof then falls for 8 - 2 = 6 seconds from way up there h+19.6 = 4.9 (36) h = 157 meters, 50 stories high !
*December 20, 2015*

**physics**

40000/3600 = 11.11 m/s 15 m/11.11 m/s = 1.35 seconds to get to Porsche starting point time t from porsche start. Vp = 3 t xp from light = (1/2)3 t^2 t car = (t - 1.35) seconds xc from light = 11.11 (t-1.35) when does xp = xc ? 1.5 t^2 = 11.11 (t-1.35) 1.5 t^2 - 11.11 t + 15 = ...
*December 20, 2015*

**Physics poweful diver**

By the way 20 meters per second is quite a spring. Are you sure it is not 2 ? say you jump with a speed up of 20 m/s from the ground at top. I will call g = 10 instead of 9.81 0 = 20 - 10 t t = 2 seconds upward h = 5 t^2 = 5(4) = 20 meters that is like 20 yards 60 feet !!! ...
*December 20, 2015*

**Physics**

v = Vi - 9.81 t h = Hi + Vi t - 4.9 t^2 A. after .5 seconds: v = 20 - 9.81(.5) h = 5 + 20 (.5) - 4.9 (.25) B. 0 = 5 + 20 t - 4.9 t^2 solve quadratic equation for t when h is zero C. at top v = 0 0 = 20 - 4.9 t at top use t at top for height h = 5 + 20 t - 4.9 t^2 D. v = 20 - 8...
*December 20, 2015*

**PHYSIS**

omega = sqrt (k/m) so 2 pi f = sqrt (k/m) so 2 pi/T = sqrt (k/m) so 2 pi/ 6.60 = sqrt (k/53) solve for k then m g = k x x = 53*9.81/k
*December 20, 2015*

**Math mystery**

if it is equilateral why does it have three different side lengths?
*December 20, 2015*

**math**

a + a+d + a+2d = 3 a + 3 d = 3(a+d)=12+3d firat = 4 third = 4+2d 7th = 4+6d r and the geometric is b, br, br^2, br^3 ... 4 = b 4+2d = b r = 4r 4+6d = b r^2 = 4 r^2 so 2 d = 4 r - 4 or d = 2r-2 6 d = 4 r^2 -4 or d = (2/3)r^2 -2/3 2 r - 2 = (1/3) (r^2 - 1) 6 r - 6 = r^2 - 1 r^2...
*December 20, 2015*

**maths**

10 m (100 cm/m) = 1000 cm
*December 20, 2015*

**physics**

p = m v so v = p/m Ke = (1/2) mv^2 = (1/2) m (p^2/m^2) = (1/2) p^2/m
*December 20, 2015*

**physics massive and momentous homework dump**

Have you tried to do all these problems or do you just think I need the practice? momentum after = momentum before momentum is a vector so momentum in the x direction after = momentum in the x direction before and momentum in the y direction after = momentum in the y direction...
*December 20, 2015*

**math**

(5 miles/ 2 minutes )60 minutes = 150 miles I assume on a race track :)
*December 19, 2015*

**Math**

a y = -x + b y = -x/a + b/a
*December 19, 2015*

**math**

h = 9 - .5 t or if you insist on x and y y = 9 - .5 x (0,9) obviously (1,8.5) (2,8) (3,7.5) etc etc etc yes, there is one y for every x y = 9 - .45 x
*December 19, 2015*

**science help PLS**

Hey, I you squeeze it, it gets denser !
*December 19, 2015*

**science help PLS**

yes
*December 19, 2015*

**science help PLS**

well, I do not think you need anything but imagination here but anyway if PV = n R T density proportional to n/V n/V = P/RT if T constant density goes down if pressure goes down
*December 19, 2015*

**MATH HELP**

F(t) = 6 t ? t is time or year F(6) = 6 * 6 = 36 Could you have a typo? Do you mean something else by 3(2) maybe 3^2 which is 9 but that would give 54 which is not a choice.
*December 19, 2015*

**math**

Surely the question was not worded that way. Do you mean assessed value of property? (8/12)(12300)(.16) = 1312 By the way a 16% tax rate is much, much higher than any I have ever heard of. No one would buy property there.
*December 19, 2015*

**Math**

II think you mean t^2 + 4 t + 30 v = 2 t + 4 a = 2 I do not know why you are supposed to know that if you are not taking calculus.
*December 19, 2015*

**Math**

Yes, that is the only one where he makes 200 or more
*December 19, 2015*

**math**

cups a cups is 8 ounces of water a pint is 16 ounces of water 8 cups is 4 pints a pint is a pound the world around (500 cm^3 of water (500 grams) is often called a pound :)
*December 19, 2015*

**Physics (Heat)**

Dry air moving over your skin causes evaporation from the surface which is cooling as well as brute force warming up if your skin is warmer than the moving air.
*December 19, 2015*

**Math**

2w+2L = 46 so w+L = 23 L = w+5 so w + w + 5 = 23 2 w = 18 w = 9 then L = 14
*December 19, 2015*

**Mathematics**

ab = 10 a + b a + b = 4 so b = (4-a) 10 b + a - 10 a - b = 18 - 9 a + 9 b = 18 -9 a + 9 (4-a) = 18 -18 a = -18 so a = 1 then b = 3 and the number is 13
*December 19, 2015*

**Physics for**

If you mean the spring force is F(x) = - k x^4 the force you have to exert is the negative of that then integral from x1 to x2 of integral-F(x) dx which is (1/5)k [ x2^5 - x1^5 ] = (1/5) k [ 1.35^5 - .73^5 ]
*December 19, 2015*

**math**

I do not know what specific level you are talking about. around third grade "Singapore Math" texts seem to be common, for example "Math in Focus" , The Singapore Approach, which you can find online for example: http://www.rainbowresource.com/prodlist.php?...
*December 19, 2015*

**math**

Ah, I think that is backwards. We learned our math from you (see Fibonacci). http://en.wikipedia.org/wiki/Fibonacci " Fibonacci popularized the Hindu–Arabic numeral system to the Western World[5] primarily through his composition in 1202 of Liber Abaci (Book of ...
*December 19, 2015*

**S.M.JR College**

(3/8) T
*December 19, 2015*

**Health 4 questions PLZ HELP MEEEEEEE**

I told you what I thought.
*December 18, 2015*

**Health 4 questions PLZ HELP MEEEEEEE**

trans fats are cheap because easily manufactured but bad 2 agree 3 agree 4 it is the percentage of what you need of that nutrient that day (somebody says)D
*December 18, 2015*

**health PLZ HELP ME ASAP**

I believe so
*December 18, 2015*

**health PLZ HELP ME ASAP**

Nutrition Facts Peanut butter, smooth style Amount Per 2 tbsp (32 g) Calories 188 % Daily Value* Total Fat 16 g 24% Saturated fat 3.3 g 16% Polyunsaturated fat 4.4 g Monounsaturated fat 8 g Cholesterol 0 mg 0% Sodium 5 mg 0% Potassium 208 mg 5% Total Carbohydrate 6 g 2% ...
*December 18, 2015*

**health PLZ HELP ME ASAP**

check out peanut butter.
*December 18, 2015*

**Social Studies**

I did not see any in any of the Tolkien movies.
*December 18, 2015*

**Social Studies**

For some mysterious reason I had a lot of trouble finding Big Horn sheep in New Zealand links with google. I did find some New Zealand hunting outfitters that were ready and willing to send clients to Colorado though :)
*December 18, 2015*

**NEED Math Help ASAP PLZ!!!**

You are welcome.
*December 18, 2015*

**NEED Math Help ASAP PLZ!!!**

direct variation means y is proportional to x (if you double x, you double y) algebraically that means; y = k * x where k is a constant which they call "constant of proportionality" and I just call "k" :) here y = (-3) * x or -3x
*December 18, 2015*

**Science**

By the way tides are much more complicated than the explanation I just gave which is attributable to Isaac Newton himself. They are fundamentally a wave motion pulled around and around the earth by the interaction of earth and moon gravity. However in the deep open ocean they ...
*December 18, 2015*

**Science**

They would smooth out and there would be no diurnal motion of the water surface. Boring, like a lake :)
*December 18, 2015*

**Science**

Most of the diurnal tide motion is caused by the rotation of earth under the moon. The moon pulls hard on the part of earth closer to the moon, that is a high tide when you look up at the moon However you get a second high tide that day when the moon is on the opposite side ...
*December 18, 2015*

**physics**

m v^2/r = .7 m g or Ac = .7 g :) 39^2 / r = .7 (9.81) r = 39^2/ (.7*9.81)
*December 18, 2015*

**PHYSICS**

v = Vi + a t v = 0 when it stops 0 = 2.7 - .12 t y = 2.25 seconds to stop d = Vi t - (1/2) a t^2 = 2.7 * 2.25 - .5 * .12 * 2.25^2
*December 18, 2015*

**Physics**

friction force up slope = mu m g cos 30 work done by friction = -80 mu m g cos 30 drop in height = 80 sin 30 = 40 ft potential energy drop = m g (40 ft) ke = (1/2) m v^2 so (1/2)m(45)^2 = 40 m g - 80 mu m g cos 30 1012 = 40(32) - mu * 32 * 69.3 1012 = 1280 - 2218 mu mu = (1288...
*December 18, 2015*

**Random answers**

Hey, try the problems. also be careful typing y-5/3=1 which is y = 8/3 is NOT (y-5)/3 = 1 which is y = 8
*December 18, 2015*

**Math**

0.9 * 59.99 = 53.99 5 * .035 * 660 = 115.50 agree
*December 18, 2015*

**English**

I agree with all four answers.
*December 18, 2015*

**One more for Damon!**

buy the pizza first 21.39 - 12.99 = 8.40 for the water 8.40/2.10 = 4 bottles or A
*December 18, 2015*

**Math**

2. 1y+1.2 y = 2.2 y so 2.2 y + 1.2 d 5. -3m + 3m + 18 = 0 + 18
*December 18, 2015*

**Math**

Hey, you asked for the average speed but you answered 8 8 is the speed OUTBOUND 24 km/3 hours = 8 8 is the speed out, not the average speed
*December 18, 2015*

**Math**

return trip took 4 hours at 6 km/h so d = 24 km (that must be to Guam from the harbor entrance buoy :) total round trip took 3+4 = 7 hours total distance = 24+24 = 48 km average speed = 48 km/7 h = 6.85 km/h
*December 18, 2015*

**Math**

Just put a 5 where I had a ? mark :) say distance d a to b time = 3 = d/v b to a time = 5 = d/(v-15) so d = 3 v and d = 5(v-15) 3 v = 5 v - 75 2 v = 75 v = 37.5
*December 18, 2015*

**Math**

outbound at speed v back at speed (v-15) say distance d a to b time = 3 = d/v b to a time = ? = d/(v-15) You did not give me all the information
*December 18, 2015*

**Math**

2.3960 = 2.3 + 0.096 + 0.0000 2.3965 = 2.3 + 0.096 + 0.0005 the 0.0005 wins in fact you would round the second one to 2.397 :) but even 2.3961 would be a winner
*December 18, 2015*

**Math (2 Part Question)**

12 d = 25 + 8 d 4 d = 25 d = 25/4 = 6 1/4 so if more than 6 days (7 or more) ==================== check how much for 6 days? without = 72 with = 25 + 48 = 73, so no pass how much for 7 days without = 84 with = 25 + 56 = 81, so yes, for 7 days cheaper with pass
*December 18, 2015*

**Math I'm DYING!!!**

You are welcome.
*December 18, 2015*

**Hey, careful !**

Need parentheses if complex numerator Perhaps you mean (y-5)/3 = 1 multiply both sides by 3 y-5 = 1*3 = 3 add 5 to both sides y -5 + 5 = 3+5 y = 8
*December 18, 2015*

**Math I'm DYING!!!**

-21 a + 16 a factor a out a (-21 + 16) a (-5) or -5a
*December 18, 2015*

**Math I'm DYING!!!**

1. y - 5/3 =1 you want to get y alone try adding 5/3 to both sides y - 5/3 = 1 +5/3 = +5/3 ---------------- add y -5/3 +5/3 = 1 + 5/3 so y = 1 + 5/3 we need a common denominator, 4 y = 3/3 + 5/3 or y = 8/3 which is 2 2/3 ===========================now check if y = 8/3 then y...
*December 18, 2015*

**sin^-1(4/5)**

well I agree with anonymous :)
*December 18, 2015*

**Maths trigonomentry**

3 cos x = 5-4 sin x 9 cos^2 x = 25 - 40 sin x + 16 sin^2 x 9 (1 -sin^2x) = 16 sin^2 x -40 sin x + 25 9 - 9 sin^2 x = 16 sin^2 x -40 sin x + 25 0 = 25 sin^2 x - 40 sin x + 16 let z = sin x 25 z^2 - 40 z + 16 = 0 (5 z - 4)(5 z - 4) = 0 wow, that was lucky sin x = 4/5 :)
*December 18, 2015*

**Maths deduce!damon or steve plz help any one**

(p-q)^2 = p^2 - 2 pq + q^2 (q-r)^2 = q^2 - 2 qr + r^2 (r-p)^2 = r^2 - 2 rp + p^2 ---------------------------add them 2 p^2 + 2 r^2+ 2 q^2 - 2(pq+qr+rp) = 2[ p^2 + r^2+ q^2 -(pq+qr+rp)] well all those squared quantities are positive so that quantity is > (pq+qr+rp)]
*December 18, 2015*

**not my thing**

sorry I suspect you have already tried expanding all that out
*December 18, 2015*

**Social Studies**

I said that partly because he established a seaport for Russia opening to the rest of Northern Europe. It was named for him for most of the history since.
*December 18, 2015*

**Social Studies**

I have to agree, but would say Navy :)
*December 18, 2015*

**Social Studies**

(or at least Magellan's crew )
*December 18, 2015*

**Social Studies**

I think B because circumnavigation is not an advance in technology.
*December 18, 2015*

**exploration or exploitation ?**

Circumnavigation is not a technology advance but an accomplishment by Ferdinand Magellan.
*December 18, 2015*

**Math help plz?**

if 3x+1 = 4 then x = 1 when x = -3, 3x+1 = -8 I have no idea, sorry
*December 18, 2015*