Tuesday

October 25, 2016
Total # Posts: 27,556

**TYPO**

b/g = 3/4 now 3 boys/7 total is again 3 boys/4 girls the schools have the same number of girls, boys and totals.

*September 14, 2016*

**Math**

b/g = 3/4 now 3 boys/7 girls is again 3 boys/4 girls the schools have the same number of girls, boys and totals.

*September 14, 2016*

**math**

7/1 5/2 8/10

*September 14, 2016*

**Geometry**

You are welcome.

*September 12, 2016*

**Geometry**

http://www.jiskha.com/display.cgi?id=1473719167#1473719167.1473720184

*September 12, 2016*

**Geometry**

I did it. Check down two

*September 12, 2016*

**science**

and snow and ice melt

*September 12, 2016*

**Geometry again**

look below

*September 12, 2016*

**geometry**

I guess the base is 3x and both sides are 2x or the base is 2x and both sides are 3x so 3x + 4x = 112 or 2x + 6x = 112 x = 112/7 = 16 and 3x = 3*16 or x = 112/8 = 14 and 2x = 2*14

*September 12, 2016*

**History**

On second thought, do not check below :)

*September 12, 2016*

**History**

Maryland, Virginia, Pennsylvania all very different charter arrangements, especially religions. Look at answers below maybe.

*September 12, 2016*

**Calculus**

I guess maybe you mean the average value of the function in that domain. integral = (3/4)x^4-4x^3 at -5 = (3/4)625-4(-125) = 968.75 at 4 = (3)64-4(64) = -64 so I get 968.75 + 64 = 1032.75 divide by length of domain, 9 I agree with you, 114.75

*September 12, 2016*

**physics**

total momentum = 0 3*5 = 2*s s = 7.5 m/s in opposite direction

*September 12, 2016*

**physics**

That is distance (scalar) not displacement (vector) angle west of north = A tan A = 15/20 = 3/4 = .75 A = 36.9 deg west of north or 360 - 36.9 = 323.1 degrees true

*September 12, 2016*

**maths**

area = (1/2) d1 d2 84 = (1/2)(12) d2 d2 = 84/6 = 14

*September 12, 2016*

**Algebra**

27*10^11 is correct Are you typing your response on a computer? Perhaps try * instead of the letter x

*September 12, 2016*

**math**

y = 3 z z + x = 36 y + x = 72 ------------ z - y = -36 so z = y-36 y = 3 (y-36) 2y = 3*36 y = 3*18 = 54

*September 12, 2016*

**Algebra**

1.2*5.9 * 10^19

*September 12, 2016*

**math**

http://www.jiskha.com/display.cgi?id=1473658340

*September 12, 2016*

**Algebra**

1.57*10^-1

*September 12, 2016*

**Algebra**

5.0800 * 10^4

*September 12, 2016*

**Math**

d = 30 t d = (1/2)(2.44)t^2 so 30 = 1.22 t t = 30/1.22 solve for t and d then v = 2.44 t

*September 12, 2016*

**Math**

V = (4/3)pi r^3 A = 4 pi r^2 4 pi r^2 = 4 pi (16) + 4 pi (64) r^2 = 80 = 16*5 r= 4 * sqrt 5 so (4/3) pi [ 4^3 *5 sqrt 5 ]

*September 12, 2016*

**Math**

You just said she ate two apples.

*September 11, 2016*

**first you try**

You are evidently studying Europe during the Renaissance. The questions are pretty fundamental to that subject. Many of the potential answers are simply inane (creating military alliances with China?). The right ones are the ones that make sense within the context of the ...

*September 11, 2016*

**algera**

t = 3 f 10 t + 50 f = 2080 10 t + 50 (t/3) = 2080 30 t + 50 t = 6240 80 t = 6240 t = 78 tens

*September 11, 2016*

**Sciene Degree**

(124/112)28

*September 10, 2016*

**math**

on number line |-3| is 3 units right of zero but -3 is 3 units left of zero so the difference is 6 units.

*September 9, 2016*

**Physics**

dn = 55*1.3 de = 65*.75 distance = d = sqrt(dn^2+de^2) displacement vector = d at angle of tan^-1(dn/de) north of east average speed = d/(1.3+.75) velocity = displacement vector/(1.3+.75)

*September 9, 2016*

**Science**

length of string ?

*September 9, 2016*

**Math**

68 - 38 =

*September 9, 2016*

**Math**

1/6 = x/1200 x = 1200/6 = 200 yes

*September 9, 2016*

**Geometry**

If the side of the cube is longer than 42 it sticks out of the prism. Two of them will fit in there because the prism is twice as long as the cube. (84 = 2 * 42) Obviously if you make that 84 length smaller, only one will fit in.

*September 9, 2016*

**science**

LOL, is the question about time on a digital clock or numbers?

*September 9, 2016*

**College mathematics**

48 cookies/.5 cups = 96 cookies/1 cup 2.25 cups * (96 cookies/cup) = 216 cookies

*September 9, 2016*

**math**

a + b = 14 a - b = 40 ============ add 2 a = 54 a = 27 b = 14 - 27 = - 13

*September 9, 2016*

**Math**

Did you try 15 and 20 ??

*September 9, 2016*

**Physics**

88.3 = (1/2) g t^2 88.3 = .5 * 23.6 * t^2 t = 2.74 seconds

*September 9, 2016*

**PHYSICS**

period = T = 1/f = 1/510 second distance in one period = 340(1/510)meters distance in 250 periods =250*340/510

*September 9, 2016*

**TYPO**

v at 19.5 = v at 8.5 + 10*11 = 105 + 110 = 215 meters/second at 19.5 that is average speed from t = 19 to t = 20 so 215 meters

*September 9, 2016*

**Science**

at 4.5 seconds it is going 65 m/s at 8.5 seconds it is going 105 m/s a = change in v / change in time a = 40/4 = 10 m/s^2 so 19.5 - 8.5 = 11 seconds v at 19.5 = v at 8.5 + 10*11 = 8.5 + 110 = 118.5 meters/second at 19.5 that is average speed from t = 19 to t = 20 so 118.5 meters

*September 9, 2016*

**copy and paste does not work here**

We can not see your list.

*September 8, 2016*

**math**

89 degrees 59 minutes 60 seocnds - 78 degrees 00 minutes 43 seconds =

*September 8, 2016*

**Physics**

I do not know the mass of the bullet but energy = (1/2) m v^2

*September 8, 2016*

**Physics**

mv rocket = m v exhaust so d/dt (mv rocket) = d/dt (mv exhaust) m v rocket = (50 - 2 t)v = m v exhaust = (2t)1000 50 v - 2vt = 2000 t 50 dv/dt -2v - 2t dv/dt = 2000 at t = 0 and v = 0 50 dv/dt = 50 a = 2000 a = 40 m/s^2

*September 8, 2016*

**Math**

-1 = 12 x - 42 + 22 19 = 12 x x = 19/12

*September 7, 2016*

**Physics**

Ke = (1/2) m v^2 work done = F d where F = .68 m g so .68 g d = (1/2) v^2

*September 7, 2016*

**maths**

x^2 + x^2 = 50 x^2 = 25 x = 5

*September 7, 2016*

**Math**

(7+10+14 + x) = 4*15 31 + x = 60 x = 29

*September 7, 2016*

**math**

23/4 = 5 with remainder 3

*September 6, 2016*

**Physics**

3 sin A = 1.7 where A is the angle upstream from straight across

*September 6, 2016*

**Math Help**

6/10 + 7/10 = 13/10 needed each bag is 8/10 so two bags is enough, 16/10 from the secondbag 3/10 is left over plus the entire third bag so remainder = 11/10 or 1 1/10

*September 6, 2016*

**Math**

she worked 2 2/4 + 4 1/4 = 6 3/4 hours 54/6.75 = dollars/hour ===================================== total amount of clay = 1 2/4 + 3/4 = 1 5/4 = 2 1/4 = 9/4 9/4 / 1/8 = 8 ( 9/4 ) = 18

*September 6, 2016*

**Algebra1**

1. If f(x)= 3x + 1 and g(x) = 4x-8, find f(1) + g(-2). a. -2 b. 4 c. 9 d. -11 I agree with you - none of the above but -12 I agree with the rest also

*September 6, 2016*

**Math**

either convert them all to decimal or use common denominator of 100 Probably the tree grows more in a hot year and less in a cold year.

*September 6, 2016*

**Physics**

It must be exciting to be aboard that aircraft, almost like a projectile Easy way - use conservation of energy (1/2)m v^2 = m g h h = v^2/2g and for time: v = 100 - 9.81 t at top v = 0 t = 100/9.81 or about ten seconds

*September 6, 2016*

**math**

divide ---- +x^2 +2x x+1 | x^3 + 3x^2 + 2x - 5 ----- x^3 + 1x^2 --------- + 2x^2 + 2x - 5 --------- + 2x^2 + 2x remainder = -5 or x^2 + 2x - 5/(x+1)

*September 6, 2016*

**science**

They are acidic

*September 6, 2016*

**science**

well I guess try: http://sciencehomeworkhelp.wordpress.com/2013/03/09/preparation-of-bleaching-powder/

*September 6, 2016*

**Physics (Momentum and collusion)**

before collision x momentum = 10m y momentum = 0 after collision x momentum = 10m = 4.7cos 60 m + Vx m y momentum = 0 = 4.7sin60m + Vy m then v = sqrt(Vx^2+Vy^2) tan A = Vy/Vx note A is in quadrant IV, below x axis if ball one went northeast

*September 6, 2016*

**MATH HELP PLEASE ASAP**

yes, but read what he said.

*September 5, 2016*

**MATH PLEASE HELP I BEG**

x has to be 2, 4 or 5 first b or c then b or c again then b because (-2,5) is not allowed

*September 5, 2016*

**Science**

potential energy at top = kinetic energy at bottom m g h = (1/2) m v^2 h = v^2/(2g)

*September 5, 2016*

**Probability**

p = 3/13 1-p = 10/13 binomial P(1 in 6)=C(6,1)(3/13)^1 *(10/13)^5 = 6 (3/13)(6.54*10^-4) = 9.06 * 10^-4

*September 5, 2016*

**Physics**

E = ke = (1/2) m v^2 that goes into the brake pads and into the water heating both up to T (1/2)1500 (400) = 4200*8.5 (T-20)+ 890*4(T-25)

*September 5, 2016*

**physics**

20 = 17.7t -(1/2)(2.5)t^2 1.25 t^2 - 17.7 t + 20 = 0 solve quadratic for t t = 1.24 or t = 12.9 well, of course it will get there in 1.24 seconds then, while we are looking the other way, it keeps deaccelerating until it stops, then comes screaming back at the guy taking ...

*September 5, 2016*

**math**

I did one, now you try.

*September 5, 2016*

**math**

g/2 on each bus b-17 on ac bus, 17 boys on hot bus g + b = 73 so b = 73-g on ac bus: 3/5[ g/2 + (b-17)] = g/2 6 [g/2 + (56-g)] = 5g 3 g - 6 g + 336 = 5 g 8 g = 336 g = 42 girls total b = 73 - g = 31 boys total so on ac bus g/2 = 21 b-17 = 14 35 total on ac bus

*September 5, 2016*

**Maths**

Did you try to do it? What did you get?

*September 5, 2016*

**falcon**

http://davidmlane.com/hyperstat/z_table.html

*September 5, 2016*

**physics**

x component = 2 cos 40 + 4 cos 127 y component = 2 sin 40 + 4 sin 127 magnitude = sqrt(x^2+y^) tan^-1 A = y/x where A = angle from x axis

*September 5, 2016*

**Science**

500 (100-T) = 300 (T-20) does not matter what the stuff is as long as it does not change phase (it was not steam at 100).

*September 5, 2016*

**Math**

1/5 = x/25 x = 5

*September 5, 2016*

**chemistry**

I suspect so; both are Ionic compounds but you need a chemist not a physicist.

*September 5, 2016*

**Math**

x - x/5 = 160 4 x /5 = 160 x = 5 * 40 = 200 x/5 = 40

*September 5, 2016*

**value**

.7 pi = c if you mean speed at the rim then v = 25 c/10 meters/second

*September 5, 2016*

**Math**

17, 1 and 2 13, 2 and 5 11, 2 and 7 are there others ?

*September 5, 2016*

**Math**

5 x - 14 + 28 x = ?

*September 5, 2016*

**Differential Calculus**

dV/dt = surface area of water * dh/dt

*September 5, 2016*

**Math**

IF it were three n-1 + n + n+1 = 645 3 n = 645 n = 2 1 5 Now you do it for 5

*September 5, 2016*

**Math**

14*10 - 10*6

*September 5, 2016*

**Statistics**

12 * 5 * 16 * 3

*September 5, 2016*

**College Algebra**

domain in years 0</= x </= 4 range in dollars 0 </= y </= 1000

*September 5, 2016*

**Math**

humm 3^(x-2) = 18 ? = 2 * 9 3^(x-2) = 2 * 3^2 2 = 3^(x-4) log 2 = (x-4) log 3 ================ e^(3x+1) = 10 ? 3x + 1 = ln 10 3x = ln 10 - 1 x = (1/3)ln 10 - 1/3 ====================== xlog 8 = x log 2^3 = 3 x log 2 3 x log 2 = 2 x log 5 - log 5 log 5 = x (2 log 5 -3 log 2) x...

*September 5, 2016*

**Algebra**

sin^2 x = sin x * sin x square root (sin^2 x) = sin x sometimes, can also be -sin x

*September 4, 2016*

**physics**

huh? if it is balanced then zero.

*September 4, 2016*

**Math**

but zero?

*September 4, 2016*

**Math**

say the number is +2 -2 + |2| = 0 which is not 2 say the number is -2 +2 +|-2| = 4 which is not true say the number is +zero -zero + |zero| = zero so sometimes (if zero :)

*September 4, 2016*

**math**

1 car would need 16 days so a car removes 1/16 pile/carday 1/16 pile /carday * 4 days *2 cars = 1/2 pile in 4 days so we need 1/16 pile/carday * n days * 3 cars = 1/2 pile n = 1/2 * 16/3 = 8/3 more days = 2 2/3 more so 4 + 2 2/3 = 6 2/3

*September 4, 2016*

**math**

Hey, I did one. Now you try.

*September 4, 2016*

**math**

13/13 x - 7/13 x = 6/13 x 2/3 * 6/13 x---> brother two 1/3 * 6/13 x --->brother 3 = 6 so 2/13 x = 6 x = 3*13 = 39

*September 4, 2016*

**Chemistry**

They both sink because they both have density greater than water (about 1 g/cm^3) Therefore the one with the greater volume will displace a greater volume of water. If they have the same mass, the one with more volume will be the diamond, because it has lower density.

*September 4, 2016*

**physics**

How could I do this without knowing the force required? Work done = energy in = force in direction of motion * .04 meters

*September 4, 2016*

**Calculus**

maybe take ln of top and bottom (1+2 lnx) --------- 2 lnx 1 + 1/(2 lnx) 1 + 1/lnx^2

*September 3, 2016*

**physics (Simple harmonic motion)**

A sin = .054 A cos = .132 sin/cos = tan(.2+P) = .054/.132 inverse tan for .2+P in radians

*September 3, 2016*

**physics (Simple harmonic motion)**

x= A sin (wt+P v = Aw cos (wt+P) a = -Aw^2 sin (wt+P) = -w^2 x f = m a -kx = -m w^2 x so as you probably know w^2 = k/m here w^2 = 2/.5 = 4 so w = 2 now at t = .1 .263 = A(2)cos(.2+P) -.216 = -A (4)sin (.2+P)

*September 3, 2016*

**Physics**

You had it right. If the tow line does not stretch, they accelerate together. Add masses

*September 3, 2016*

**Physics**

You are welcome :)

*September 3, 2016*

**Physics**

first 8 seconds: v = 0 + 3 *8 = 24 m/s at t = 8m/s x = 0 + 0 t + (1/2)(3)(64) = 96m the brakes for four seconds Vi = 24 a = -5 Xi = 96 t = 4 x = 96 + 24(4) - (1/2)(5)(16) x = 96 + 96 - 40 x = 152

*September 3, 2016*

**Physics**

In your car you measure speed with your speedometer, no negative about it. Tho get velocity you need both speedometer and compass, speed which is absolute value and also direction. If east is positive, west is negative.

*September 3, 2016*