Thursday

April 17, 2014

April 17, 2014

Total # Posts: 16,150

**Algebra!**

You are welcome.

**Algebra!**

What is the solution of x^2+14x+112=0? If necessary, round to the nearest hundredth. (1 point) x = [ -14 +/-sqrt(196 -448) ]/2 x = -7 +/- (7.94)i A box shaped like a rectangular prism has a height of 17 in and a volume of 2,720 in^3 The length is 4 inches greater than twice th...

**Algebra!**

What is the value of n so that the expression x^2+11x+n is a perfect square trinomial? (1 point) x^2 + 11x + (5.5)^2 (x+5.5)^2 = x^2 + 11 x + 30.25 What is a solution of x^2+6x=-5? (1 point) x^2 + 6 x + 5 = 0 x = [ - 6 +/- sqrt (36-20) ]/2 x = -3 +/- 2 x = -5 or -1 What is the...

**trig**

sin T = 714/1000 so csc T =1/sin T= 1000/714 = 500/357 tan T = 714/700 = 102/100= 51/50 cos T = 7/10 You have them right but mislabeled.

**Physics**

That is what the grating is all about !

**college physics 2**

yes For the same m (lambda) for smaller d, you need BIGGER theta so the peaks on the target will be further apart as d shrinks.

**college physics 2**

The first off center maximum occurs when the path lengths to the screen from the two slits differs by one wavelength. If you move the slits closer together, the angle to the screen must increase to get path lengths a wavelength different. Therefore is you decrease the spacing ...

**TO: DrBob222 science**

Search with Google. For example: type hydrocyanic acid resulting first link is: https://www.google.com/search?q=hydrocyanic+acid+formula&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a&channel=sb yields instantly HCN

**physics**

the metal was moving in the direction the gas was pushing. That is positive work. As for the first part, figure out how many mols of water vapor you have and how many mols of air, Then do PV = nRT to get partial pressures of each. That final pressure inside is ten times atmosp...

**math 1 question pls help!!!!!**

I think since it is similar everything changed by 1/2 and the new volume is 1/8 times the old 240/8 = 30 ft^3

**Math HELP!! Who can solve??**

None of those but D/(2z), perhaps B Q L / 200 or A

**physics**

It is hard to tell without the velocity.

**College math**

A + 1.5 A = 18 2.5 A = 18 A = 7.20 B = 10.80

**whoops**

Whoops, sorry, use Steve' result.

**calculus**

integral = -(2t-5)/(t^2-5)^2 at infinity ---> -2t/t^2 = 2/t = 0 at 6 = (5-2)/31^2 = .00312 It does not diverge but has a finite answer. If t = sqrt(5) were included, we would have had a problem with a zero denominator.

**TO DrBob222 Science**

Less than 7 is acidic.

**TO DrBob222 Science**

http://www.jiskha.com/display.cgi?id=1395270068

**Math help understand**

They both travel for time t = 3 hours the bike goes: d = 15 t the bus goes d + 195 = v t so d = v t - 195 but t = 3 so 15(3) = v(3) - 195 45 = 3 v - 195 3 v = 240 v = 80 km/h

**Physics**

Ac = v^2/r F = m Ac = m v^2/r = 80 (3.2^2)/2.4 = 341 N = 340 N to two figures

**Physics.**

m v^2/r = 1.9 (2.8)^2/2.3 Newtons

**Math**

20 things could happen in the two tosses for example D1 first then D2 or Q1 or Q2 or Q3 or D2 first then D1, Q1 Q2 Q3 or Q1 first then D1 D2 Q2 Q3 . . etc Both quarters out of the 20 I see 6 so 6/20 = 0.3 both dimes I see 2 out of the 20 or 0.1 both dimes or both quarters I se...

**geometry**

1 rev is distance of pi D so pi D feet/9 minutes = speed in feet/min .495 mi/h * 5280 ft/mi * 1 h/60 min = 43.56 feet/min SO pi D/9 = 43.56 D = 9 (43.56)/pi or D = 125 feet

**math trig**

a^2 + 100 = 225 a^2 =125 = 25 * 5 a = 5 sqrt 5

**Science URGENT PLEASE**

You are welcome :)

**Science URGENT PLEASE**

1. sour, acid <7 2. H+ and O-2 sort of H3O+ and O-2 is another way to look at it 2 b H O H because that is shape of molecule 2 c same number of 2 H+1 as O-2 3 a H+ up 3 b beats me, why should it change? 3 c OH- up, what else is new? 4 http://facultyfp.salisbury.edu/dfrieck/...

**math trig**

cos/(1+sin) + (1+sin)/cos cos^2/[ cos(1+sin) ] +(1+sin)^2 /[cos(1+sin)] (cos^2 + 1 + 2 sin + sin^2)/[cos(1+sin)] but cos^2 + sin^2 = 1 ( 2 + 2 sin) /[cos(1+sin)] 2 (1+sin)/[cos(1+sin)] 2/cos which is 2 sec

**algebra**

Jim - 13 = Tom Jim + Tom = 75 Jim + (Jim - 13) = 75 2 Jim - 13 + 75 2 Jim = 88 so Jim = 44 Tom = Jim-13 = 31

**math**

-220 = 360 - 220 = 140 which is 180 - 40 which is 40 degrees above the -x axis in quadrant 2 tan and cot are negative in Q2 tan 40 = .839 so cot 40 = 1/.839 = 1.19 BUT it is negative so -1.19 <------------

**math**

You are welcome. Good luck !

**math**

I do not think it is. If you put them over a common denominator it is easy. If you use your calculator to look at them as decimals it is really, really easy.

**Science question, only 1**

I think we would starve because no plants would grow but maybe die from no conversion of CO2 to C and O2 without photosynthesis first.

**Physics**

total mass = .5 + .005 = .505 kg potential energy = m g h = .505*9.81*.08 = .396 Joules that is Ke at bottom (1/2) (.505) v^2 = .396 v = 1.25 m/s momentum = m v = .505 * 1.25 = .633 kg m/s

**Phy**

Post once please

**Physics**

Been there, done that

**Algebra ll**

You are welcome :)

**Algebra ll**

simple yearly interest rate i (percent = 100 i) at n = 1 first year beginning Amount = A second year Amount = A + Ai Third year Amount = A + 2 A i This is an arithmetic sequence with A = starting amount A i = d so Amount = A + d (n-1) recursive Amount n = Amount (n-1) + d wher...

**Math (algebra)**

V = pi r^2 h = 500 so h = 500/(pi r^2) area of side = 2 pi r h area of top and bottom togethr = 2 (pi r^2) =2 pi r^2 cost = C = .11(2 pi r^2) +.06(2 pi r h) C = .22 pi r^2 + .12 pi r [500/(pi r^2)] C = .22 pi r^2 + 60/r C = .691 r^2 + 60/r I need to use calculus to find the ma...

**Math (algebra)**

Area = x y A = x (36 - x^2) = 36 x - x^3 domain is 0 </= x </= 6 assuming that it has to be on the POSITIVE x axis( the function would work fine for negative x but you specified + x) for largest I have to use calculus dA/dx = 0 at max = 36 -3 x^2 x^2 = 12 x = 2 sqrt 3 wh...

**Criminal investigation**

You are welcome :)

**Criminal investigation**

Joe the slasher, who has disposed of 14 people so far who squealed on him to the cops, might resent your testimony.

**math**

each drives for time t and the sum of their distances is 1080 70 t + 65 t = 1080 135 t = 1080

**math --- check my work!**

You are welcome.

**math --- check my work!**

5. sqrt[804/(4 pi)] = 8 check 4 pi (64)= 804.24

**algebra**

The line over the D multiplies the D(which is 500) by 1000

**algebra**

With a line over the D

**algebra**

I think DMMMCCCIII https://int.darkbyte.ru/503303

**Physics**

I assume your 4.2 meters is vertical component of ramp since you did not give an angle. m g h = 11 * 9.81 * 4.2 = 453 Joules decrease in potential energy That goes in PE of spring (1/2) k x^2 = 453 250 x^2 = 906 x = 1.90 meters due to velocity k x = weight = 11*9.81 x due to w...

**Math**

Sketch a number line and mark the points on it. Then list them from left to right.

**simple physics**

normal force on floor = 750 sin 25 + 9.81 m friction force =.73(750 sin 25 + 9.81 m) so 750cos25 = .73(750 sin 25 + 9.81 m) solve for m

**PHYSICS**

You are welcome. As always, check my arithmetic.

**PHYSICS**

Initial speed = 3 m/s acceleration constant during braking therefore average speed during stop = 3/2 = 1.5 m/s time to stop = t =7 m / 1.5 m/s = 4.67 seconds v = Vi +a t 0 = 3 + a(4.67) a = -0.643 m/s^2 F = m a F = 5 (.643) F = 3.21 Newtons F = mu (weight) 3.21 = mu (5)(9.81) ...

**Enough with the spaming.**

We are here to help. Please try to do your own work before asking for help with virtually identical problems.

**Math**

-1 * 14.8 -2 * 7.4 -4 * 3.7

**help i have no idea!!!!!!**

Now wait a minute, try this yourself.

**help i have no idea!!!!!!**

1 m/s * 5 * 60 = 300 so she has 100 left to walk

**help i have no idea!!!!!!**

d = rate * time 45 * 4 = rate * 5 rate = 45 * 4 / 5 = 36 km/h

**carver**

If each grandchild gets half a cup of sugar in punch, Bruce missed the class on nutritional errors.

**Linear Algebra**

That is fine as long as you did not skip any parentheses when you typed the question as Steve asked. We are all assuming that h^3 is in the numerator.

**Linear Algebra**

2 were wrong, he told you what was wrong.

**Physics**

work is the product of force and the distance moved in the direction of the force. No motion = no work

**physics**

Initial momentum = 2(200) -9(20) = 400 - 180 = 220 final momentum = 11 v Conservation of momentum, Newton's First Law ---> 220 = 11 v so v = 20 m/s

**Discrete Mathematics**

36 possibilities total white = 1 ---> 5 with white smaller white = 2 --> 4 . . . white = 5 --> 1 In other words 5+4+3+2+1 = 15 out of 36 15/36 = .417

**Math**

275 - 225 = 50 degrees difference in heading In two hours Ship A went 16 * 2 = 32 Sbip B went 20 * 2 = 40 c^2 = a^2 + b^2 - 2 a b cos C c^2 = (32)^2 + (40)^2 -2(32)(40)cos 50 c^2 = 1024 + 1600 - 1646.5 c^2 = 978.4 c = 31.3 For pert B, similar triangle, double time, double dist...

**Quadratic Functions in Algebra**

x^2 - 6 x = C-20 x^2 - 6 x + 9 = C - 11 (x-3)^2 = C-9 vertex at x = 3,000 and cost = 900

**Algebra: Quadratic Functions**

-16 t^2 + 128 t = s - 70 t^2 -8 t = -s/16 + 4.375 t^2 - 8 t + 16 = -s/16 + 20.375 (t-4)^2 = -(1/16) (s - 326) vertex at time = 4 and height = 326

**Math**

5 green 20 total first green = 5/20 = 1/4 second green = 4/19 (1/4)(4/19) = 1/19

**College Math**

"Union" Anything in A, B or both 2 , 3, 5 , 6 , 7 , 9 http://mbaker.columbiastate.edu/algebratips_pages/union%20and%20intersection.htm 5 is the intersection of A and B by the way

**physics**

M is irrelevant at acceleration a, v = a T L = (1/2) a T^2 a = 2 L/T^2

**vocabulary power unit 5 grade 6**

synonym ----> two words that mean the same thing eg if you had HAPPY then A) miserable B) joyful C) sad E) cantankerous You would circle B (I think :)

**Math**

4/7 = x/4 x = 16/7

**math**

0.9 - 6 r -2 (0.2) 0.9 - 6 r - 0.4 0.5 - 6 r

**Math**

If you multiply the top and bottom of a fraction by the same thing you do not change the value of the fraction. 0.4 * 10 ----------- 0.2 * 10 is exactly the same as 4 ---- 2

**math**

20 x + 8 - 6 so 20 x + 2

**Physics**

work to lift = m g h = 750 * 9.81 * 13.2 Joules/minute work for Ke = (1/2)(750)(17.4)^2 Joules/minute C) add those and divide by 60 to get Joules/second or Watts

**math**

draw radii from center to the three intersections on the circumference all length r sine of half angle up at intersection of 13 cm legs = 5/13 so half angle = 22.6 deg isosceles triangle now with legs r meeting base 13 at 22.6 angle cos 22.6 = r/6.5 r = 6.5 cos 22.6 r = 6

**Physics**

weight = m g normal force down on floor N= m g+Fsin 28 friction force back = .25 N so F cos 28 = friction force back (a) F = friction force back / cos 28 force component in direction of motion = F cos 28 Newtons d = 4.1 meters so (b) Win = 4.1 F cos 28 Joules (c) -4.1 F cos 28...

**math**

30 + 10 w - w = 30 + 9 w

**Algebra**

(1/5) / 3 = 1/(5*3) = 1/15

**math**

.8 * 14 * 5 = $56

**chemistry**

CuNO3 molar mass = 63.5 + 14 + 3(16) = 125.5 grams/mol 8.22 g /125.5 g/mol = .0655 mols of the stuff .0655 mols/x liters = .59 mols/1 liter x = .111 liters

**Math**

2*3*2 = 12 4 of them are red (thick, thin, small Lg) 2 of them (a small and a large) -----------------red ---------small --yellow -----------------blue thick ------------------ red ---------large --- yellow -------------------blue -------------------red ---------small ----yell...

**Physics**

If your scale reads in grams or kilograms, that is mass assuming you do this on earth without acceleration (do not do it while in free fall before opening your parachute) If your scale reads in pounds, that is really force, not mass. Convert the pounds to kilograms.

**physics**

THINK !!! B goes up when current goes up, that is what causes B gets weak when you get away from wire of course. so the second choice

**Alegbra**

You do this one, same way as I did the other one.

**Alegbra**

8.2*10^5 / 2.75 * 10^-3 = (8.2/2.75) * 10^(5+3) = 2.98 * 10^8

**AP Calc**

sure, the base is y, the hypotenuse the center of the base is at y/2 half the base = the altitude

**AP Calc**

It is all in the first quadrant, base = y

**AP Calc**

area of triangle at x with base y: altitude of triangle is y/2, same as half the base so area = (y/2)(y/2) = y^2/4 y^2 = b^2 (1 - x^2/a^2) so y^2/4 = (b^2/4) (1 - x^2/a^2) integrate that from x = 0 to x = a

**College math**

LOL - now how am I to respond to that ? Thank you and you are welcome :)

**College math**

b^2 = 16 4 a c = 24 oh my b^2 - 4 a c is Negative :( That means we have a pair of complex conjugate roots

**PHS 105**

F = m a F is the same on both (Third Law) m2 a2 = m1 a1 10 m1 a2 = m 1 a1 a 2 = a1 /10 if a1 is 1 then a2 = 0.1 m/s^2

**scince i try i have no idea**

Google them for example force definition physics yields among other links: http://physics.info/newton-first/

**math**

200 * 1/3 is one way

**math**

9/16 or anything else greater than 1/2 and less than 1

**AP Calculus**

I assumed circumscribed meant outside, but it is unclear indeed.

**AP Calculus**

sketch the graph of e^x with the rectangles of height e^2, e^4 and e^6 and base of 2 each 2 e^2 + 2 e^4 + 2 e^6 = 2 (e^2 + e^4 + e^6)

**physical science**

Period = 1/f = (1/5.3)10^-14 seconds distance = speed * time lambda = 3*10^8 m/s * (1/5.3)* 10^-14 = .566 * 10^-6 meters = 566 * 10^-9 meters 10^-9 meters is nanometers, usually used for visible light wavelength

**physics**

P = angular momentum = I omega I1 = (1/2) m r^2 = (1/2)(4.7)(.17)^2 = .0679 P1 = (.0679) 2 pi (1.8) I2 = I1 + (1/2)(3.1) (.065)^2 = .0679 + .00655 = .0744 P2 = P1 so .0744 (2 pi)(rps) = .0679 * 2 pi *1.8 rps = 1.64 revs/s so I agree with you wholeheartedly

**Physics**

You are welcome :)

**Physics**

short string ----> higher frequency !!! f = k/L so (5/4) 440 = 550

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