Sunday

May 1, 2016
Total # Posts: 1,019

**Chemistry**

Complete and balance these half-equations. Express as net ionic eqn. 1.) Cr2O7(2−) → Cr(3+) (acidic solution) So far, I have: Cr2O7(2−) + 14H + 6e(-) →2Cr(3+) + 7H20 2.) C2O4(2−) → CO2 (acidic solution) Not sure how to do this one. Thank you.
*April 14, 2016*

**math**

Sam has 9yellow pencils in his desk three fourth of his pencils are yellow how many pencils does sam have in his desk
*April 9, 2016*

**ratio and proportion**

Three villages share water from a water tank.The tank holds 3,600 gals of water. The villages used the following ratio 2:3:4. how many gallons does village b use? how many gallons does a and c use together? wahat is the difference on the amount used by c and b?
*April 5, 2016*

**division and remainder...error ws from my teacher not me**

1+2^2+3^3+4^4+.....+10^10 when is is divided by 5 what is the remainder!! show working,please have been trying that i could not,get it
*March 23, 2016*

**divison&remainder**

1^2+2^2+3^2+.......+10^10 when divide by 5 whats the remainder i made no typo thats the question i proff read
*March 22, 2016*

**remainder help!@steve and damon**

1^2+2^2+3^2+......+10^10 when it divided by 5 what the remainder???? even a hint can,t help me my head is fried have been do math alday just show me the working i beg!
*March 22, 2016*

**Science**

Thank you!
*March 18, 2016*

**Science**

is there a chart available that show the vapor pressure of Isopropyl alcohol and water solutions at 68 degrees F ?
*March 18, 2016*

**calculus!!!! help**

integrate:cosx+2/cosx+sinx
*March 16, 2016*

**calculus help!!!!! plz**

integrate:cosx+2/cosx+sinx?????
*March 16, 2016*

**maths**

find the encentricity,the foci and vertex and the equation of directrix and asymptote to the equation give the ellipse below 25x^2+4y^2-50x-16y-59=0
*March 16, 2016*

**maths help!!!**

the first four terms in the expansion of (1-x)^n are 1-6x+ax^2+bx^3.find the n and also the respective value for a and b
*March 16, 2016*

**physics**

compute the mass of the following assuming if it to be a sphere of radius 6370km
*March 16, 2016*

**maths**

integrate:cosx+2/cosx+sinx
*March 16, 2016*

**Chemistry**

The higher the vapor pressure rating the more quickly the solution will volatilize so the lower the boiling point. Conversely, the lower the rate the more slowly it evaporates so the boiling point is higher.
*March 14, 2016*

**math**

How to write a real world problem that compares the ratios 5to 9 and 12to 15
*March 13, 2016*

**physics**

The displacement of a particle is given by S = a+bt+ct^2. Deduce the dimensions of the constants,a,b,and c appearing in the question.
*March 8, 2016*

**Math Trigonometry**

A bus driver driving south along a highway is 16 km from the nearest city. After traveling a distance of 32 km, the driver finds he is 19 km away from the same city. Find the bearing of the town from the second position of the motorist.
*March 4, 2016*

**math 8th**

The scores on a test are found by adding and subtracting points as shown in table below. If Salazar's score on a 15 question test was 86 points,how many of his answers were correct, incorrect and blank. Answers Points correct +8 incorrect -4 blank -2 86 divided by 14 = +6...
*March 3, 2016*

**US History**

Why were yeoman farmers often called "the backbone of the South" in the period from 1820 to 1850? A) When government officials wanted to oversee how Southern land was cultivated, yeoman farmers challenged the idea. B)Yeoman farmers grew vegetables, raised animals, ...
*March 2, 2016*

**Physics**

1. A box is placed on the end of a 3 meter plank. One end of the plank is gradually raised and it is observed that the box begins to slide when the board reaches an angle of 25 degrees. a. Determine how long the box will take to reach the end of the plank if the coefficient of...
*February 29, 2016*

**Math**

Peter has 4 more $50 bills than $10 bills in his wallet. If the total amount of money in his wallet is $380, how many $10 bills does Peter have? I know the answer but I don't know how to set up the equation.
*February 24, 2016*

**PHYSICS ASAP PLEASE**

Do the m and 1/2 cancel each other out for the ground level question?
*February 23, 2016*

**PHYSICS ASAP PLEASE**

A pellet (20g) is launched horizontally off a cliff (20m high) from a spring-loaded gun. The spring has constan k=1800 N/m and is compressed 0.10m before launch. How much kinetic energy does the pellet have just before it hits the ground? How fast will the pellet be going just...
*February 23, 2016*

**Social Studies**

How did Jackson react to the Supreme Court's Worcester v. Georgia decision?
*February 20, 2016*

**Math just explain**

Using the quadratic formula we get x=(-3±sqrt(3^2-4*1*2))/2=(-3±1)/2 so x=-1 or x=-2.
*February 15, 2016*

**math**

Let the side be x and the height h. Then x^2+4xh=48 and h=(48-x^2)/(4x). Now we have an expression for the volume in x: V(x)=x^2h=x^2*(48-x^2)/(4x)=12x-x^3/4. Taking the derivative we get V'(x)=12-3/4x^2=0. The volume is maximal when V'(x)=0 so 12-3/4x^2 and the ...
*February 15, 2016*

**furthermaths**

The kth number kan be written a1+(k-1)d, d difference. The sum of the ten first is a1+a1+d+a1+2d+a1+3d+…+a1+9 and by looking at the a1 and d separately we get 10a1+(1+2+3+…+9)d=10a1+(9*10)/2=10a1+45d=60 using an arithmetic sum. Similarly, we get for the other sum ...
*February 15, 2016*

**math**

Use prime factorization: 144=12^2=3^2*2^4, 96=2^5*3 and 0.36=9/25=3^2/5^2 so 144x96/0.36=(3^2*2^4*2^5*3)/(3^2/5^2) and multiply by the reciprocal (3^2*2^4*2^5*3)*5^2/3^2=2^4*2^5*3*5^2=2^9*3*5^2=38400. Answer: 38400
*February 15, 2016*

**Math**

2/5*1/5 and 3/4*1/2.
*February 15, 2016*

**MATH I just need explanation very easy ( for you)**

We want to solve x^2+3x+2=0. We already have 0 alone so we don't need to subtract anything, but of course we can subtract LHS from RHS and get -x^2-3x-2=0 but that is the same as just multiplying both sides in the equation with -1 which is of no help. The idea of ...
*February 15, 2016*

**Algebra**

It is hard to understand what you mean without parentheses but the way I see it A can be simplified since sqrt 4 = 2 and C can be written as x^2-sqrt (3yx^2). So B and D are simplified.
*February 15, 2016*

**maths**

a bicycle wheel has a diameter of 42 cm.how many revolutions will it make to cover a distance of 13.2km
*February 6, 2016*

**math**

A man seated on a chair has a mass of 85 kg. Known that the mans weight is distributed so the chairs back legs support twice as much as the front legs. What is the mass taken by each leg?
*February 6, 2016*

**physics the Rang**

U2 Sin 2a =g =34.66m
*January 29, 2016*

**physics projectile**

The speed of projection is 40m/s upward.The negative value gives the speed at which the dody again arrives at the level of projection
*January 29, 2016*

**Calculus plz help!!!**

Integrate:Root(1+root(x))/x
*January 15, 2016*

**Algebra help help!!!**

Algebra 4^x-3^(x-1/2)=3^(x+1/2)-2^(2x-1)....... Plz help me
*January 12, 2016*

**Reposting chemistry help!!!**

A metal x forms two different chloride.if 12.g of chloride A and 16.3g of chloride B contain 7.1g and 10.7g of chlorine respectively,show that the figure agree with the laws of multiple proportions.write there formulea plz i need the working.....
*January 12, 2016*

**Calculus help!!!**

X^2y+sinxy=e^xy i need solution plz
*January 12, 2016*

**Chemistry chlorine plz help**

A metal x forms two different chloride.if 12.g of chloride A and 16.3g of chloride B contain 7.1g and 10.7g of chlorine respectively,show that the figure agree with the laws of multiple proportions.write there formulea plz i need the work....no hint plz
*January 12, 2016*

**MATHS**

Line AB has the equation y= ¼x + 6 write down the gradient of a line that is Parallel to line AB and perpendicular to line AB (2×1=2)
*January 10, 2016*

**Math**

Solve the system using elimination. 10y − 2x = 50 6x − 3y = 12 A. (5, 6) B. (2.1, 0.2) C. (2.1, 4.6) D. (6, 5)
*January 5, 2016*

**french(le passe compose)**

i went home last week He helped me with my homework I visited him yesterday
*January 5, 2016*

**math**

What is the are of 18ft 18ft 4ft 3ft 3ft
*January 4, 2016*

**Physics**

Hmmm
*December 30, 2015*

**Physics college**

A particle is thrown from the origin of the frame xOy at the moment t = 0, with speed v0 at a certain angle b from the Ox axis. At the same moment another particle begins to fall freely from a wall with height h, situated at the distance d. Air resistance is neglected. Find ...
*December 27, 2015*

**Physics help**

Find the differential equation of motion for a gravitational pendulum of mass m and length a by using the fact that the torque of its weight relative to the point of suspension is equal to the time derivative its angular momentum. Solve this equation to obtain the equation of ...
*December 27, 2015*

**physics**

a spring of force constant 1500N/m is acted upon Hy a constant force of 75N .calculate the potential energy stored in the spring
*December 21, 2015*

**MEKELLE**

Arrange increasing rates of diffusion H2 CO CO2 N2 He O2 SO2
*December 20, 2015*

**Math**

5+3+2+4+40·1-1/8
*December 16, 2015*

**Calulus**

Fundamental Theorem of Calculus 1. (4e^x-3)dx plus the number in x (6,1)
*December 11, 2015*

**Calulus**

Consider the function y = 2x^3-3x^2+9x+5. 1. Find where the function is increasing, where the function is decreasing, and calculate all relative extrema (local max and local min) 2. Find where the function is concave up, where the function is concave down, and find the ...
*December 11, 2015*

**Calulus**

You have 300 square feet of wood you will use to construct a rectangular shed with a square base and top. What is the maximum volume of your shed? Optimization Question
*December 11, 2015*

**Calculus**

As an ice cube melts its surface area in decreasing at a rate of 6 cm^2 / sec. Find the rate at which the length of each side is decreasing at the moment when each side has length 2 cm.
*December 11, 2015*

**Physics**

A natural gas power plant burns natural gas to produce electricity. In one second it produces 500 MJ of electrical potential energy. The power plant consumes chemical energy in order to produce electrical potential energy. --In one second does it consume 500 MJ of chemical ...
*December 9, 2015*

**Physics**

A person slides down a slope. At the end of their slide they are brought gently to rest by a large spring. Friction on the slope cannot be ignored. Draw an energy bar chart for this situation. Define your system any way you want, but clearly state how you have defined your ...
*December 9, 2015*

**Math**

A river flows at the speed of v from west to east. How should a man who is at a point A of the southern bank of the river, which is d meters away from the river, and wants to reach a point B on the northern bank of the river, which is 2d meters away from the river, choose his ...
*December 7, 2015*

**geometry**

Let $\overline{PQ}$, $\overline{RS}$, and $\overline{TU}$ be parallel chords of a circle. The distance between chords $\overline{PQ}$ and $\overline{RS}$ is 4, and the distance between chords $\overline{RS}$ and $\overline{TU}$ is also 4. If $PQ = 78$ and $TU = 50$, then find...
*December 6, 2015*

**Algebra**

wwas this right
*December 4, 2015*

**Physics**

As usual, a drag coefficient of 0.5 is a reasonable guess. A cyclist going at a steady speed is mostly working to keep drag from slowing them down (rolling friction plays a part but is much smaller). Estimate what the power output is of a cyclist going at 40 km/hr.
*December 2, 2015*

**Algebra 1- Just one question please :)**

Was this right @basketball&batman
*December 1, 2015*

**Math **

A strees light L hangs H feet above a flat straight street. A person h feet tall at point O directly under the street light at time t=0 seconds, moves in a straight line along the street a v feet/second. If H=20 feet, h=6 feet, and v=4 miles per hour, find the velocity v of ...
*November 30, 2015*

**Math**

A spherical balloon expands uniformly as it is inflated. The radius of the balloon in r meters at time t seconds. Find the radius, the volume, and the surface area of the balloon when the rates of increase of the surface area of the balloon and the radius are numerically equal
*November 30, 2015*

**Math**

After school, Laura baby sits a neighbor's child for 50 minutes. They rest for 10 minutes,read for 15 minutes,and play the rest of the time. Write the total baby sitting time, the resting time and reading time, as fractions of an hour.
*November 30, 2015*

**Math/Fractions **

After school, Laura baby sits a neighbor's child for 50 minutes. They rest for 10 minutes,read for 15 minutes,and play the rest of the time. Write the total baby sitting time, the resting time and reading time, as fractions of an hour.
*November 30, 2015*

**Math**

4/10 of a mile from Jose's house to the school.
*November 30, 2015*

**Math**

Shawn rides his bicycle 9/10 mile to school. On his way to school, he stops at Mike's house, which is 1/5 mile from Shawn's house. Then they both ride to José house, which is 2/7 mile from Mike's house. How far is it from Jose's house to the school?
*November 30, 2015*

**Math**

Suppose that a cyclist began a 510 mi ride across a state at the western edge of the state at the same that a car traveling toward it leaves the eastern end of the state if the bicycle and car met after 8.5 hr and the car traveled 33.4 mph faster than the bicycle find average ...
*November 29, 2015*

**Math**

Suppose that a cyclist began a 450 mi ride across a state at the western edge of the state, at the same time that a car traveling toward it leaves the eastern end of the state. If the bicycle and car met after 7.5 hr and the car traveled 30.4 mph faster than the bicycle, find ...
*November 29, 2015*

**College Physics**

a man pushes a lawn mower 50 feet in 5 second by exerting a force of 30 pounds at an angle of 53 with the horizon. find the work done and the average power expended?
*November 27, 2015*

**College Physics**

a man pushes a lawn mower 50 feet in 5 second by exerting a force of 30 pounds at an angle of 53
*November 27, 2015*

**Physics**

3. A low friction cart (similar to what you use in the lab) collides with a second low friction cart. Cart A has a mass of 0.500 kg and cart B has a mass of 0.750 kg. Glider A was moving at 40.0 cm/s before the collision. Glider B was at rest. (a) The carts have velcro on them...
*November 23, 2015*

**Physics**

One end of a spring is attached to the ceiling. The unstretched length of the spring is 10.0 cm. A 2.0 kg mass is hung from the other end of the spring. It is slowly lowered until it comes to rest. At this point the spring is 15 cm long. (a) What is the stiffness (spring ...
*November 23, 2015*

**math fractions**

Sherry spent 1/5 of her money on school supplies and 3/8 of the remainder on a CD player. She had $25 left. How much money did she have at first? do not use algebra
*November 19, 2015*

**Algebra**

right/
*November 17, 2015*

**History vocabulary **

I have looked every where. I am in honors 7th grade history. Help please I need a sentence with the word mullah and jihad?
*November 17, 2015*

**Physics**

A car is traveling North. In which direction are the wheels turning. This is under the torque chapter
*October 24, 2015*

**Physics**

A car is traveling North. In which direction are the wheels turning. This is under the torque chapter
*October 24, 2015*

**chemistry**

2.17kcal
*October 24, 2015*

**physics**

There is a car turning on an unbanked road. The mass of the car is 2000kg moving at constant speed 36mph. The radius of the unbanked curve is 100m. the driver sees an obstacle at 20m ahead along the curve. he presses the brakes and expects to have a constant deceleration along...
*October 23, 2015*

**MATH**

One half of a number minus 9 is 14
*October 22, 2015*

**St Eugene university**

Solve x^2 times second derivative -3x times first derivative -5y =sin(logx) my solution is integrating both sides we have sinxlogx
*October 17, 2015*

**physics**

A ball starts at the top of a ramp with an incline of 7 degrees and rolls down, picking up speed. (see the table below) Time (s) Position (m) 0 0 .4917 .1 .7625 .15 .975 .3 1.1583 .45 1.2833 1.6467 (a) Linearize the data and find the slope of the new line. [Slope=.3745?] (b) ...
*September 30, 2015*

**biology**

what is the difference between an exergonic reaction and an endergonic reaction?
*September 24, 2015*

**Ap world history**

lack of wars
*September 16, 2015*

**Chemistry**

1. What volume of nitric acid solution with mass fraction of 16% is required to make make 250ml solution with 0.2mole/l?
*September 15, 2015*

**Political Science**

Does the representation system in the U.S. Senate still make sense today? Why or why not?
*August 28, 2015*

**Political Science**

Develop an argument for a strong national government, or for greater state sovereignty and independence.
*August 28, 2015*

**PHIL324L**

reinterpreting motives
*August 19, 2015*

**English**

There should be more pe taught in school each week - rhetorical question
*June 27, 2015*

**solving two-step inequality**

Translate the following inequality into written language. 5x-6<14
*June 9, 2015*

**chemistry**

Can methane and oxygen be separated. If yes, can anyone please mention the method
*May 11, 2015*

**Physics**

28.8 m/s
*May 5, 2015*

**Statistics**

A particular fruit's weights are normally distributed, with a mean of 353 grams and a standard deviation of 6 grams. If you pick one fruit at random, what is the probability that it will weigh between 334 grams and 344 grams?
*May 4, 2015*

**Math**

9121518
*April 30, 2015*

**Physics**

A ball rolls off the edge of a 0.75m high lab table with a horizontal speed of 1.50 m/s. Calculate the time that the ball is in flight, calculate the vertical velocity of the ball just before striking the floor, and calculate the horizontal distance(range) that the ball will ...
*April 16, 2015*

**Algebra 2 math**

In triangle GHI, angle H is a right angle, GH = 40, and cos G= 40/41. Draw a diagram and find each value in fraction and in decimal form. a) Sin G b. Sin I c. Cot G d. csc G e. cos I f. sec H - I have no idea how to do this
*April 8, 2015*

**age question**

A man is 24 years when his son was born. Now he is three times as old as his son. Find the age of the son.
*April 3, 2015*

**Social Studies**

Not to be rude or anything
*March 30, 2015*