Saturday

November 28, 2015
Total # Posts: 3,080

**physics**

Identical +1.39 µC charges are fixed to adjacent corners of a square. What charge (magnitude and algebraic sign) should be fixed to one of the empty corners, so that the total electric potential at the remaining empty corner is 0 V?
*October 4, 2011*

**Math**

regroup 2 tens, 2 ones; 1 ten, 12 ones Name the word that describes what was done to show the number in different ways.
*October 4, 2011*

**geometry**

Given a line l, let A be a point on l, and B another point not on l. a. prove all the points of the line segment AB, except for A lie on the same side as B.
*October 4, 2011*

**Calculus**

is there a number a such that the lim x->2 6x^2+ax+a+57/x^+x-6 exists? if so find the value of a and the limit.
*October 3, 2011*

**Science - Chemistry**

A certain elixir is 92 proof. A proof is twice the volume percentage of alcohol in a blend. Ethanol's structural formula is CH3CH2OH with a molar mass of 46 grams/mole. The density is .79 g/ml. How many liters of elixir must one have in order to have 50 moles of carbon?
*September 29, 2011*

**physics**

a European farm has a land area of 0.425km^2. determine this area in acres . 1.000 acre =43,560ft ^2
*September 27, 2011*

**writing decimals**

How do you write 0.013 in expanded notation
*September 27, 2011*

**math**

23.6 repeating in fraction notation
*September 26, 2011*

**math**

23.6repeating find fraction notation
*September 26, 2011*

**math**

23.6 repeating find fraction notation
*September 26, 2011*

**chem**

an aluminum engine block has a volume of 4.77 L and mass of 12.88 kg. whate is the density of aluminum in g/cm 3
*September 24, 2011*

**logic**

g --> h ~h v k g k --> w Prove: W
*September 22, 2011*

**logic**

g --> h ~h v k g k --> w Prove: W
*September 22, 2011*

**math**

6 40/20 6 5/20 =12 9/20 12 9/20 /2=249/20/ 2/1 =249/20 *1/2 =249/40 and the answer was 1 209/40 it had to be a mixed number
*September 20, 2011*

**math**

1 209/40
*September 20, 2011*

**math**

find the average 6 1/5 and 6 1/4
*September 20, 2011*

**math whats wrong with the answer**

(1/4)2 +3/4* 2 3/5 =214/96
*September 19, 2011*

**math**

what is the answer as a integer
*September 19, 2011*

**math**

(1/2)^2 +1/2 * 2 2/3 simplify
*September 19, 2011*

**math**

to find the perimeter, you just have to add the length+width+length+width of all sides. s in this case, the perimeter will be: 80m 80m 100m + 100m = 360m
*September 19, 2011*

**fith grade math**

well i'm trying to do 49 x27 how would you do that?
*September 19, 2011*

**Science**

Pleas unscramble this word acnsrl spherical It's a tool to measure force.
*September 19, 2011*

**Physics **

a uniform rod of 3 kg and length 1 m is suspended from a fixed point by means of strings of length .8m and .6m which are attached to the free ends of the rod such that rod is horizontal. find the tensions in the string
*September 19, 2011*

**Essential Mathemtics 1**

10 2/3 / 4
*September 19, 2011*

**Essential Mathemtics 1**

15 * 4 2/3
*September 19, 2011*

**Essential Mathemtics 1**

13 1/3 / 6 2/9
*September 19, 2011*

**Mathemtics 1**

Lol noooooo 3 1/9 * 2 1/4 is what I'm trying to solve.
*September 19, 2011*

**Mathemtics 1**

I do but it's 3 numbers in both the fractions, on that website, it's only 2.
*September 19, 2011*

**Mathemtics 1**

Uhmmm That didn't help much.
*September 19, 2011*

**Mathemtics 1**

3 1/9 * 2 1/4
*September 19, 2011*

**Essential Mathematics 1**

7 1/3 - 2 5/6
*September 19, 2011*

**Biology**

A student claims the probability a human sperm will receive all chromatids of maternal origin is 50 %. Explain why she is wrong. Are the following true or false and support your answer: i. Red blood cells and nerve cells in adult humans are suitable for karyotyping (...
*September 19, 2011*

**physics**

Did you convert the micro-coloumbs to coloumbs? The equation worked fine for me.
*September 18, 2011*

**physics**

A certain cable car is San Francisco can stop in 10 s when traveling at maximum speed. On one occasion, the driver sees a dog a distance d m in front of the car and slams on the brakes instantly. The car reaches the dog 7.78 s later, and the dog jumps off the track just in ...
*September 15, 2011*

**physics**

A jet plane lands with a speed of 87 m/s and can accelerate at a maximum rate of -5.30 m/s2 as it comes to rest. (a) From the instant the plane touches the runway, what is the minimum time needed before it can come to rest? What is the actual minimum distance needed to stop ...
*September 15, 2011*

**physics**

A hockey player is standing on his skates on a frozen pond when an opposing player, moving with a uniform speed of 12 m/s, skates by with the puck. After 2.0 s, the first player makes up his mind to chase his opponent. If he accelerates uniformly at 4.0 m/s2, determine each of...
*September 15, 2011*

**physics**

A ball is thrown vertically upward with a speed of +13.0 m/s. (a) How high does it rise? (b) How long does it take to reach its highest point? (c) How long does the ball take to hit the ground after it reaches its highest point? (d) What is its velocity when it returns to the ...
*September 15, 2011*

**physics**

A model rocket is launched straight upward with an initial speed of 30.0 m/s. It accelerates with a constant upward acceleration of 1.50 m/s2 until its engines stop at an altitude of 170 m. (a) What is the maximum height reached by the rocket? (b) How long after lift-off does ...
*September 15, 2011*

**lamar**

3(2x+5)=39
*September 15, 2011*

**Math: Factoring**

3(1+x)^ 1/3 -x(1-x)^ -2/3 -------------------------------- (1+x) sqrt 2/3 please help the line means divisionn of the underlined numbers and variables.
*September 15, 2011*

**Math: Factoring**

sorry i said it wrong. i just posted it again with correct info.
*September 15, 2011*

**Math: Factoring**

yes
*September 15, 2011*

**Math: Factoring**

3(1+x)sqrt 1/3 -x(1-x)sqrt -2/3 -------------------------------- (1+x) sqrt 2/3 please help
*September 15, 2011*

**Spanish**

What article do I use with sueter in spanish
*September 15, 2011*

**Physics**

A person walks 23.0° north of east for 2.60 km. How far due north and how far due east would she have to walk to arrive at the same location?
*September 14, 2011*

**physics**

Two boat landings are 6.0 km apart on the same bank of a stream that flows at 2.8 km/h. A motorboat makes the round trip between the two landings in 50 minutes. What is the speed of the boat relative to the water?
*September 14, 2011*

**physics**

At t = 0, a stone is dropped from a cliff above a lake; 2.1 seconds later another stone is thrown downward from the same point with an initial speed of 33 m/s. Both stones hit the water at the same instant. Find the height of the cliff
*September 14, 2011*

**Physics**

it is going directly north
*September 14, 2011*

**Physics**

A plane flies at an airspeed of 242 km/h. A wind is blowing at 72 km/h toward the direction 60° east of north. What is the speed of the plane relative to the ground?
*September 14, 2011*

**Pre-calculus**

how to graph the polynomial function f(x)= -x^4 - 4x^2 by hand. Please Help!!!
*September 14, 2011*

**calculus**

given f(x)=3x-5 , evaluate each of the following f(4) F(x+2) f(-x)
*September 14, 2011*

**Math**

polynomials (2z - 7) (-z + 3)
*September 13, 2011*

**Math**

In December,the average total rainfall in all of the deserts together is 0.89 mm. Explain how to use the figures from the table to write a comparison of the total desert rainfall in August and December.
*September 13, 2011*

**math**

By default, your numerical entry is scored as correct if it is within 1% of the correct answer. A rule of thumb is always to enter at least 3 digits for numerical questions. If the correct answer is 7.08809, which of the following entries would be counted as correct? 7.024 7....
*September 12, 2011*

**geometry**

What is the area of the top of a box that is 14 by 19 cm?
*September 11, 2011*

**Physics**

Two trucks having equal speeds hit their brakes at the same time, but truck has three times the acceleration as truck . Question:If truck B stops in time T, how long (in terms of T) will it take for truck A to stop?
*September 10, 2011*

**psychology**

if there is a positive correlation between the number of computers one possesses and the person’s heart health. what is a third variable (X) that may explain this correlation that is a cause of each one of the two variables. If X goes up the number of computers is likely ...
*September 9, 2011*

**english**

what logic does jack use to assure the others that there are no large beasts on the island?
*September 8, 2011*

**Physics**

An austronaut orbits the Earth in the space shuttle, in one complete orbit, is the magnitude of thr displacement the same as the distance traveled?
*September 8, 2011*

**math**

I need help to justify my square root answer. I think if I could have an example that would help me with the rest of my homework. One of my problems is the square root of 31. thx.
*September 7, 2011*

**physics**

part 1 Simpson drives his car with an average veloc- ity of 47.5 km/h to the east. How long will it take him to drive 137 km on a straight highway? Answer in units of h part 2 How much time would Simpson save by in- creasing his average velocity to 105 km/h to the east? Answer...
*September 6, 2011*

**physics**

How much time would Simpson save by in- creasing his average velocity to 105 km/h to the east? Answer in units of min
*September 6, 2011*

**physics**

It takes you 9.7 min to walk with an average velocity of 2.2 m/s to the north from the bus stop to the museum entrance. How far did you walk? Answer in units of m
*September 6, 2011*

**College statistics**

Do students at various universities differ in how sociable they are? Twenty-five students were randomly selected from each of three universities in a region and were asked to report on the amount of time they spent socializing each day with other students. The result for ...
*September 5, 2011*

**chemistry**

The density of brass is 8,600 kg/m3 or 8.6 g/mL. You have 2 kg of brass. What is the volume?
*September 3, 2011*

**Math**

35x+3150-30x=3420 5x=270 x=270 Row 1 54 seats Row 2 51 seats
*August 31, 2011*

**Math**

At the Sacramento Monarchs home games, Row 1 seats cost $35 each and Row 2 seats cost $30 each. The 105 seats in these rows were sold out for the season. The total receipts for them were $3420. How many of each seat were sold?
*August 31, 2011*

**Algebra 1**

Find the distance between the pair of points (-8,2) (-9,5). Express as a decimal approximation rounded to the nearest hundredth if necessary.
*August 30, 2011*

**Finance**

Johnson Motors’ bonds have 0 years remaining to maturity. Interest is paid annually, the bonds have a $1,000 par value, and the coupon rate is 8 percent. The bonds have a yield to maturity of 9 percent. What is the current market price of these bonds?
*August 30, 2011*

**chemistry**

Which of the following can be classified as a pure compound? Choose one answer. a. iodine, I2 b. sugar, C12H22O11 c. mercury, Hg d. alcohol in water, C2H5OH in H2O e. carbon, C
*August 23, 2011*

**History**

I need help on this also :(
*August 9, 2011*

**Physics**

Hi, I have this question, except I don't know to solve. I think it has something to do with exponential decay and heat flow, but I would like some more help. "3 kg of ice and a 12-pack of ice-cold soda are placed in a 25" x 25" x 40" (outside dimensions...
*August 9, 2011*

**Biochemistry**

Given that ∆Go’ = -15 kJ/mol and k1 = 1.5 X 10-6s-1, calculate k2.
*August 3, 2011*

**Math**

nvm, just solved it.
*August 3, 2011*

**Math**

Solve the equaton by completing the square. 4x^2-8x-3=0
*August 3, 2011*

**physics**

A tennis ball of mass 0.057 kg is served. It strikes the ground with a velocity of 54 m/s (120 mph) at an angle of 21° below the horizontal. Just after the bounce it is moving at 51 m/s at an angle of 19° above the horizontal. If the interaction with the ground lasts 0...
*August 2, 2011*

**physics**

A ceiling fan has four blades, each with a mass of 0.40 kg and a length of 65 cm. Model each blade as a rod connected to the fan axle at one end. When the fan is turned on, it takes 4.45 s for the fan to reach its final angular speed of 2.3 rev/s. What torque was applied to ...
*August 2, 2011*

**physics**

Martin caught a fish and wanted to know how much it weighed, but he didn't have a scale. He did, however, have a stopwatch, a spring, and a 5.50 N weight. He attached the weight to the spring and found that the spring would oscillate 20 times in 64 s. Next he hung the fish...
*August 1, 2011*

**physics**

A car moving at 35 mi/h is stopped by jamming on the brakes and locking the wheels. The car skids 53 ft before coming to rest. How far would the car skid if it were initially moving at 56 mi/h?
*August 1, 2011*

**Math**

Bryan and Kim are painting a house. Working together they can paint a house in three-fifths the time it takes Kim to paint the house working alone. Bryan takes 15 hours to paint the house alone. How long does it take Kim to paint the house working alone?
*August 1, 2011*

**Math / Linear Equations**

I was looking on a website that teaches linear algebra and it had this problem: 3x - 15 _______ =0 2x + 1 And it says the answer is: x = 5 But I don't understand how to get that answer so I hope someone can give me step by step directions for it.
*July 30, 2011*

**math**

Solve: x(x-3)=x-9 Is this correct? Thanks x^2 - 3x = x - 9 x^2 - 3x -x = 9 x^2 - 4x - 9 = 0
*July 28, 2011*

**math**

2a^2+3=7a 2a^2-7a+3=0 2a-1)*(a-3)=0 2a-1=0 or a-3=0 a=1/2 or a=3
*July 28, 2011*

**math**

solve by factoring 2a^2+3=7a Thanks
*July 28, 2011*

**math**

factor out the greatest common factor -36m^2n^3-60mn^4+18m^4n^2
*July 27, 2011*

**MATH!**

is this correct? Completely factor the following expression: 64y^2-49z^2 Is the answer: 128 y-49
*July 27, 2011*

**Can someone help me with this one Please! :)**

factor out the greatest common factor -36m^2n^3-60mn^4+18m^4n^2
*July 27, 2011*

**Is this correct?**

is this correct? Completely factor the following expression: 64y^2-49z^2 Is the answer: 128 y-49
*July 27, 2011*

**Algebra**

factor out the greatest common factor -36m^2n^3-60mn^4+18m^4n^2
*July 26, 2011*

**math**

Interval notation is a method of writing down a set of numbers. Usually, this is used to describe a certain span or group of spans of numbers along a axis, such as an x-axis. However, this notation can be used to describe any group of numbers. For example, consider the set of ...
*July 26, 2011*

**math**

is this correct? Completely factor the following expression: 64y^2-49z^2 Is the answer: 128 y-49
*July 26, 2011*

**Pre cal**

)a function f is defined as f(x) = 3*2^x describe the end behavior of f, please describe in detail how you got the answer and explain your abbreviations.
*July 25, 2011*

**Pre Cal**

ok, thats wahat i thought but wasn't sure.
*July 25, 2011*

**Pre Cal**

what is the big +x? and so the answer is "so for big +x the function looks like just plain old x, a straight line of slope +1" and "then the numerator is positive x^2 and the denominator looks like x so the result is again looks like x, that same straight line ...
*July 25, 2011*

**Pre Cal**

what does it mean when it says describe the end behavior of f and whats that for f(x)=(x^2+x+3)/(x-1) and f(x)= 3*2^x, please explain everything, and if you use --> tell me what that means, cuz i have no clue
*July 25, 2011*

**Math**

what does ---> +or - infinity mean? and what that for f(x)=(x^2+x+3)/(x-1) and f(x)= 3*2^x
*July 25, 2011*

**Math**

what does it mean to describe the end behavior of f in a graph?
*July 25, 2011*

**Pr-Cal/Trig**

Thanks
*July 25, 2011*

**Pr-Cal/Trig**

1)if the graph of f(x)=cotx is transformed by a horizontal shrink of 1/4 and a horizontal shift left pi, the result is the graph of: a) g(x)= cot[1/4(x-pi)] b) g(x)=cot[1/4(x+pi)] c) g(x)=cot[4(x-pi)] d) g(x)=cot[4(x+pi)] e) g(x)=cot[4x+pi] please include how you got the answer
*July 25, 2011*

**Pre Cal**

If the graph of f(x)=cotx is transformed by a horizontal shrink of 1/4 and a horizontal shift left pi, the result has what equation?
*July 25, 2011*