Friday

September 19, 2014

September 19, 2014

Total # Posts: 18,557

**physics**

LOL, the way MathMate did it is a lot easier :)
*May 24, 2014*

**physics**

The total energy at the top of the trajectory is the same as was stored in the spring (1/2)kx^2 Total energy at top where v = 0 = (1/2) u^2 + m g h we can find u, horizontal velocity easily u = 24.7 m/2.72 s = 9.08 m/s but Vi, initial speed up is easy too tan 55.8 = Vi/u Vi = ...
*May 24, 2014*

**Algebra**

a^(-1.5) ?
*May 24, 2014*

**physics**

say the mass is 1 and the length is 1 if the length were 0.98, the volume would be .98^3 = .941 then if the mass were 1.03 density = mass/volume = 1.03/.941 = 1.094 or 9.4 percent greater
*May 24, 2014*

**Physics**

Volts is not power Amps is not power WATTS is power (volts times amps) watt hours is energy, not power so it has to be 10 kW which is very high, let me see 220 Volts * 50 amps = 11,000 Watts = 11 kW well this is a pretty hefty oven. I could not run two of them in my house :)
*May 23, 2014*

**math**

All the y values are positive the bottom of the V is at (0,0) Hey just sketch the x and y points !
*May 23, 2014*

**math**

what is that symbol? absolute value? y = |-x| is the same as y = |x| x y -3 3 -2 2 -1 1 0 0 1 1 1 2 etc. looks like V
*May 23, 2014*

**math**

slope is NEGATIVE 1/3
*May 23, 2014*

**math**

it goes through (0,5) and (15,0) I do not know what you mean by coordinates or where those numbers come from
*May 23, 2014*

**math**

no, it goes down to the right
*May 23, 2014*

**math**

no graph the line when x = 0 , y = 5 when x = 15 , y = 0
*May 23, 2014*

**Physics**

You are welcome :)
*May 23, 2014*

**Physics**

i = charge /second 5.6 = 116/t t = 116/5.6 = 20.7 call it 21 s
*May 23, 2014*

**Physics**

You are welcome.
*May 23, 2014*

**Physics**

amps is charge per second coulombs/seconds n C /n s so 1.5 C/1.5 s
*May 23, 2014*

**Math**

yes
*May 23, 2014*

**Math**

t = k/r 2 = k/67 k = 134 (which happens to be the distance) t = 134/r t = 134/55 t = 2.436 hours
*May 23, 2014*

**Science**

weight = f ( vitamin A) weight is dependent on vit A hypothesis the weight of the rats depends on how much vitamin A they get in their diet.
*May 23, 2014*

**Math**

Carla, Ms Sue told you to type them in order, then look at the middle.
*May 23, 2014*

**Math**

even number, average of the two middle ones
*May 23, 2014*

**Maths**

y = k/x 2 = k/8 k = 16 y = 16/x a^2-b^2 = (a-b)(a+b) always
*May 23, 2014*

**Algebra**

1 2 3 4 5 6 * * 2/6 = 1/3
*May 23, 2014*

**Math**

You are welcome :)
*May 23, 2014*

**Math**

If c = .2 n = 6/.2 = 30 so sold 25 for .3 so got 25*.3 = 7.5 sure enough
*May 23, 2014*

**Math**

1.25 * 6 = 7.5 profit = 1.5 let cost per box = c sales price = s = c+.1 bought n gave away 5 sold (n-5) cost = n c = 6 so n=6/c sales = (n-5)(c+.1) so (n-5)(c+.1) - 6 = 1.5 (6/c -5)(c+.1) = 7.5 6 -5c + .6/c -.5 = 7.5 -5c + .6/c = 2 -5 c^2 -2 c + .6 = 0 5 c^2 + 2 c -.6 = 0 c...
*May 23, 2014*

**Algebra 1--Please, help me!**

Incomprehensible. Typos?
*May 23, 2014*

**Algebra 1**

look for vertex of the parabola in algebra. (You would be able to do it much faster with calculus or physics) t^2 - 9.25 t - 1.875 = -h/16 t^2 - 9.25 t = -h/16 + 1.875 t^2-9.25t+4.265^2 = -h/16 +1.875+21.39 ( t-4.265)^2 = -1/16( h - 372.25) So, I think it is d and at 4.265 ...
*May 23, 2014*

**Math**

Nah, I do not have to do an experiment. there are four equally likely outcomes.
*May 23, 2014*

**Science**

http://www.jiskha.com/display.cgi?id=1400875475
*May 23, 2014*

**having trouble please help?**

Do you think we should allow them ... starts out biased (should we throw them in jail or merely hang them?) "syrupy soft drink" implies bias ---> Should there be a ----- no bias healthy versus unhealthy ? certainly biased
*May 23, 2014*

**Calculation in chemistry**

2 grams of M in 8 grams of MOn where M is metal symbol and n is O atoms per metal atom There were 8-2 = 6 grams of O in MOn 6 grams of O * (1 mol of O/16 grams) = 6/16 = 3/8 mol of O which is 3/16 mol of O2 so 3/16 mol of O2 combines with 2 grams metal so .5 mol of O2 combines...
*May 23, 2014*

**Math**

draw a sketch The bottom has height 7 The top has height 9 The left side is at 4 the right side is at 8 what is missing is the upper right at (8,9)
*May 23, 2014*

**science**

v = g t 20 = 9.81 t t =2.03 seconds h = (1/2) g t^2 h = 4.9 (2.03)^2 h = 20.4 meters
*May 23, 2014*

**Science**

same Justin the whole tie amount of tissue needed depends on type of tissue used pulse rate is the dependent variable and I do not know why you say it is not write as: pulse rate = f(music type) see definition:http://dictionary.reference.com/browse/dependent+variable
*May 23, 2014*

**physics**

final momentum = 4.7 (1000+2200)=15040 initial momentum = 1000 v so v = 15.04 m/s
*May 23, 2014*

**physics**

a liter is 10^3 = 1000 cm^3 so we have 22.4 * 1.5 = 33.6 moles of gas at 273 deg K and 100 kPa P V = n R T n and r remain the same so P1V1/T1 = P2V2/T2 100 (1500)/273 = P2 (1000)/253 P2 = 139 kPa ABSOLUTE pressure - 100 KPa for gage = 39 k Pa gage
*May 23, 2014*

**Algebra**

Here is a combinations and permutations calculator to get permutations, the "Is order important" box should be YES to get combinations the is order important box is NO http://www.mathsisfun.com/combinatorics/combinations-permutations-calculator.html Here you are ...
*May 22, 2014*

**HELP!!!! MATH**

LOL, I would have had the 15 degrees from horizontal, living on the bleak ocean where at least a seven to one scope is required.
*May 22, 2014*

**geometric**

No C) foot
*May 22, 2014*

**geometric**

Given those English unit choices, I think foot is the correct choice. A standard shipping container is 20 feet long but most these days are double that, 40 feet long.
*May 22, 2014*

**Physic**

x = A sin w t v = A w cos wt a = -w^2 A sin wt = -w^2 x so A w = .438 or w = .438/A A w^2 = 1.53 so A *(.438)^2/A^2 = 1.53 so 1.53 A = .192 A = .125 m
*May 22, 2014*

**One last math question**

1/2 - 1/9 = 9/18 -2/18 = 7/18 18 * 7/18 = 7 2/3 - 1/6 = 4/6 - 1/6 = 3/6 = 1/2 9 * 1/2 = 9/2 so 7+9/2 = 14/2+9/2 = 23/2 then 23/2 / (5/2) = 23/5 = 4 3/5
*May 22, 2014*

**math**

Draw a sketch of the ten tables in a row. Only two people can sit at the middle ones because the ends are up against the next tables. for the two tables on the end, the usual two can sit plus one on each end of the whole line
*May 22, 2014*

**math**

20* .3 + 15 * .05 = 6 + .75 = 6.75 ============================ the middle 8 tables only seat 2 but the two end tables seat 3 8*2 + 2*3 = 16 + 6 = 22
*May 22, 2014*

**algebra**

h(m+1) = 2 f f = h(m+1)/2
*May 22, 2014*

**5th Grade ADV. Math**

You are welcome :)
*May 22, 2014*

**5th Grade ADV. Math**

another way A plays the other 3 B plays only C and D more because has already played A that is 2 more C plays only D because has played A and B so one more 3+2+1 = 6 again plus that last game = 7
*May 22, 2014*

**5th Grade ADV. Math**

That did not line up right, but I hope you see the point
*May 22, 2014*

**5th Grade ADV. Math**

Whoops, you do not do it that way in grade 5 Make a grid ___A___B___C___D A --- * --* --* B----------*---* C--------------* D ------------- The stars are the games played in the first round You see there are 6 of them then the final is 7
*May 22, 2014*

**5th Grade ADV. Math**

combinations of four taken two at a time = 4C2 = 4!/[ 2! (4-2)! ] = 4*3*2 /(2 * 2) = 6 games before the final so 7
*May 22, 2014*

**calculus**

If you draw this you see you want the integral from y =0 to y = 3 of -x dy y = ln(1-x) e^y = 1-x -x = e^y -1 so integral from 0 to 3 e^y dy - dy e^y - y at 3 = e^3-3 e^y - y at 0 = 1 so e^3 - 4 about 20 - 4 = 16
*May 22, 2014*

**pre-algebra**

when x increases by 2, y always decreases by 1 so m = slope = -1/2 y = -x/2 + b put in a point like (4,0) 0 = -4/2 + b so b = 2 so y = -x/2 + 2
*May 22, 2014*

**Math**

You are welcome.
*May 22, 2014*

**Math**

The top of the first rainbow will not fit into the bottom of the one above it.
*May 22, 2014*

**math**

tan 15 = d/495
*May 22, 2014*

**math**

You are welcome :)
*May 22, 2014*

**math**

yes -10 + 8 = -2 yes 9 - (-9) = 9+9 = 18
*May 22, 2014*

**Algebra where did I go wrong**

5! / [ 2! (5-2)! ] 5!/(2! 3!) 5 * 4 * 3 *2 /(2 * 3 * 2) 10
*May 22, 2014*

**math**

combine LIKE terms 8x + 6 x = 14 x 2 = 2 so 14 x + 2
*May 22, 2014*

**MATH**

You are welcome.
*May 22, 2014*

**MATH**

L * w = 225 2 L + 2 w = 60 so L + w = 30 and w = 30-L L (30-L) = 225 30 L - L^2 = 225 L^2 -30 L + 225 = 0 (L-15)(L-15) = 0 L = 15 meters
*May 22, 2014*

**SCIENCE HELP !!**

Do muskrats eat catfish? If so, they might get hungry.
*May 22, 2014*

**college calculus**

.5 = e^-k(5730) ln .5 = -.6931 = - 5730 k k = 1.2097*10^-4 .45 = e^-1.2097*10^-4 t ln .45 = -.7985 = -1.2097*10^-4 t t = 6601 years
*May 22, 2014*

**Algebra**

I can not. { x-[ -2 + sqrt(160) ]/6} * {x+[ -2 + sqrt(160) ]/6}
*May 22, 2014*

**History**

I guess I would go with Midway of the choices above. He certainly did not buy Alaska from Canada :)
*May 22, 2014*

**History**

seward's folly
*May 22, 2014*

**History**

Lots of things, including buying Alaska (Seward's Folly)from Russia :)
*May 22, 2014*

**algebra/ Can see I am right**

arrangements of three letters: 26^3 = 17576 but subtract 241 17335 times 1000 17,335,000
*May 22, 2014*

**Math please check my answers?**

237 (1.02)^t is correct
*May 22, 2014*

**Math please check my answers?**

slope = (83- -29) / (-2 - -10) = 112/8 = 14 which is indeed positive :)
*May 22, 2014*

**appliance repair**

Although E is the answer they are looking for, E is much more commonly used for the electric field strength which is Volts per meter. The question is poorly written.
*May 22, 2014*

**Algebra**

You are welcome. This is a good example to diiferentiate between combinations and permutations Combinations of 31 taken 5 at a time would be 31! /[ 5! (31-5)! ] That takes into account all the different groups of five you can make, but does not order the five for specific ...
*May 22, 2014*

**Algebra**

It is not combinations because the order matters, it is permutations. (Joe could be either president or vice president for example and those are not the same) 31!/(31-5)! = 31!/26! = 31*30*29*28*27 = 20,389,320
*May 22, 2014*

**Evaluate the expression.Algebra**

9*6*3 /(6*4) 9*3/4 27/4
*May 21, 2014*

**geometry**

2 x + 10 = 80 2 x = 70 x = 35
*May 21, 2014*

**physics**

used up 67,500 + 290,000 - 30,000 Joules
*May 21, 2014*

**math 6 probaility**

there are four possible outcomes of flipping a pair h h h t t h t t so you should get h h 60/4 = 15 times we got it 24 or 9 more times than expected
*May 21, 2014*

**math 6 probability**

It is a whole new game after the first play. 75% IF you had said what is the probability of him hitting two in a row, that would be .75*.75 BUT that is NOT what you were asked.
*May 21, 2014*

**math**

up 4 in horizontal 10 so 4/10 = .4
*May 21, 2014*

**math**

do the others the same way
*May 21, 2014*

**math**

That was using the distributive property. You can also use FOIL if you know it.
*May 21, 2014*

**math**

4. (3x + 4)(x – 2) (1 point) 3x(x-2) + 4(x-2) 3 x^2 - 6 x + 4x - 8 3 x^2 -2x - 8
*May 21, 2014*

**math**

2 x * 10 x = 2*10 * x *x = 20 x^2 2. –3m(m + 8) = -3 m(m) + -3m(8) = -3m^2 - 24 m
*May 21, 2014*

**math 6 probability**

no, it hit the red section 225 times out of 1125 times spun
*May 21, 2014*

**math 6 probability**

5*225 = 1125
*May 21, 2014*

**History**

I guess you are talking about Canada maybe? Railways came after the revolution in the US. Was Canada several colonies so they could have inter-colonial railways?
*May 21, 2014*

**Algebra please check my answers**

4) The formula below can be used to find the amount of radioactive material that remains after a certain period of time, where A0 is the initial amount of material, A is the amount of material remaining after t hours, and k is the decay constant. A = A0(2.71)-kt...
*May 21, 2014*

**Algebra please check my answers**

3) Robert is considering purchasing a manufactured home that costs $77,300. If he expects the home value to decrease 8% each year, which function will show the value of Robert's manufactured home in t years? A. V(t) = $83,484t B. V(t) = $77,300(-0.92)t C. V(t) = $77,300(1....
*May 21, 2014*

**geometry**

6/15 = x/81
*May 21, 2014*

**Math**

band alone 11 choir alone 17 band and choir alone 4 band and math alone 7 math and choir alone 6 band choir and math 3 math alone 9 from 11+4+10+6+17 + M = 57 so 2 classes = 4+7+6 = 17
*May 21, 2014*

**Math 6 meters help**

144 = 2L + 2 w so L + w = 72 L = w + 4 so w + 4 + w = 72 2 w = 68 w = 34 then L = 38 A = L * w = 38 * 34 = 1292
*May 21, 2014*

**algebra**

not combinations because order does not matter in combinations we need permutations of 7 taken 4 at a time p(n,r) = n!/(n-r)! = 7!/3! = 7*6*5*4 = 840
*May 21, 2014*

**Algebra**

x intercept of f(x) = -3 y intercept of f(x) = 12 g(x) = -3 x -9 x intercept of g(x) = -3 y intercept of g(x) = -9 so it is not A
*May 21, 2014*

**HIS204**

By the way I agree with Stephen and with Ms. Sue. However I feel especially strongly about 4.4 since I lived in California during the war and friends of my family were included. http://www.history.com/this-day-in-history/war-relocation-authority-is-established-in-united-states
*May 21, 2014*

**HIS204**

4.4 !!!! Look up history of Japanese - Americans during WW2
*May 21, 2014*

**Math**

8*8 = 64 squares first piece has two possible spots so 2/64 is chance it will pick one of them now there are 63 spots left and the second piece has to hit it. 1/63 is that probability 2/64 * 1/63 = 4.96*10^-4 = .000496 ------------------------------- 8 rows first piece can hit...
*May 21, 2014*

**Math 6. Correct?**

You are welcome.
*May 21, 2014*

**Math 6. Correct?**

3/18 = 5/30 yes
*May 21, 2014*

**Math 6. Correct?**

30 feet = 360 inches 360/5 = 72 to 1 4.5 inches * 72 = 324 inches = 27 feet not 29.5
*May 21, 2014*

**trianom**

the minute hand does two complete circles distance around 2 circles = 2 * 2 pi r = 4 * pi * 9 = 113 inches
*May 21, 2014*

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