Thursday

May 28, 2015

May 28, 2015

Total # Posts: 1,075

**algebra**

The sum of two numbers is 82. Their difference is 24. Choose the system of equations that describes this situation. Solve by elimination to find the two numbers.
*December 21, 2012*

**algebra**

Thanks, now i got it :)
*December 21, 2012*

**algebra**

I still trying to do it, but it is hard for me, can you explain that again? Thanks Ms. Sue.
*December 21, 2012*

**algebra**

Solve the system of equations using substitution. y = x + 6 y = –2x – 3
*December 21, 2012*

**algebra**

Solve the system of equations using substitution. y = 2x – 10 y = 4x – 8
*December 21, 2012*

**algebra**

Identify the graph of the pair of equations as parallel, intersecting, or identical. y = 5x – 4 y = 5x – 5
*December 21, 2012*

**algebra**

Does the system of equations have no solution, one solution, or infinitely many solutions? y = 2x – 3 y = –x + 3
*December 21, 2012*

**algebra**

Does the system of equations have no solution, one solution, or infinitely many solutions? y = x + 4 y – 4 = x
*December 21, 2012*

**algebra**

Which graph represents the following system of equations? y = 3x + 3 y = –x – 3
*December 21, 2012*

**7th grade science**

sperm
*December 12, 2012*

**Physics**

When a metal pipe is cut into two pieces, the lowest resonance frequency in one piece is 244Hz and that for the other is 454Hz. What resonant frequency would have been produced by the original length of pipe? (Assume the speed of sound in air is 345 m/s) ^ I already got the ...
*December 2, 2012*

**Chemistry**

Suppose I put 1 billion bacteria in a 10 ml tube of saline, mix well, and label this tube A. Answer the following questions: 1. Take 1 ml from tube A and put it in an empty tube B. What is the concentration and number of bacteria in tube B?
*November 27, 2012*

**Chemistry**

Suppose I put 1 billion bacteria in a 10 ml tube of saline, mix well, and label this tube A. Answer the following questions: 1. Take 1 ml from tube A and put it in an empty tube B. What is the concentration and number of bacteria in tube B?
*November 27, 2012*

**world history**

Which of the following was not an innovation that came about due to militarization in the 1800s?
*November 27, 2012*

**MATHS**

how can you explain the steps and formula
*November 20, 2012*

**MATHS**

Differntiate sin(sinx) using the product rule
*November 20, 2012*

**Math**

Solve the equation: 125^r=5
*November 14, 2012*

**Math**

What is the inverse equation of f(x)=(x+2)/(x-1)?
*November 14, 2012*

**Intergated chemistry/physics**

Draw a setup containing 3 gears. For every turn of the input gear, you need the output gear to spin 9 times. The drawing doesn't have to be perfect, but make sure to label the input gear, the output gear, and the number of teeth on each gear. Please E-mail me the picture ...
*October 31, 2012*

**physics**

A 80 kg object slides at a 20 degree plane downward at 5m/s. An object 2 collides with object 1 by falling from 7 meter height and they stick together. Final speed of objects? I know the speeds would be the same. Would momentum equation work to solve this? The perfect ...
*October 25, 2012*

**science**

what are some interactions that can take place when a beam of light hits a glass tank and then enters the water
*October 24, 2012*

**stats**

Suppose a shipment of 500 machine parts contains 62 defective and 438 non-defective machine parts. From the shipment you take a random sample of 25. You are interested in the number of defective machine parts out of 25 trials and corresponding probabilities. When sampling with...
*October 21, 2012*

**Calculus 2**

how do I find the fluid force of a vertical semicircle that has been divided into three equal sectors of 60 degrees each. I know what the equation to find the fluid force for the whole semicircle is. but how do I find L(y) for each semicircle.
*October 11, 2012*

**Intergated chemistry/physics**

You are riding a 30 pound bicycle and you weigh 150 pounds. You are travelling at 20 miles per hour and fail to notice the 30 pound dog is in your path. If you transfer half of your momentum to this dog, what speed could he potentially reach?
*October 4, 2012*

**Intergated chemistry/physics**

Your teacher bumps into you in the hallway and knocks you down. After he apologizes, he asks you to figure out how fast he was going. By some magical coincidence, you just happened to be wearing a gauge that measured your mass to be 75 kilograms and your speed to be 25 miles ...
*October 4, 2012*

**Intergated chemistry/physics**

A 200 pound go-kart with a speed of 20 miles/hour collides with a 2nd go-kart (that was at rest) and causes it to move at a speed of 15 miles per hour. What is the mass of the 2nd cart if the first kart came to a stop upon collision?
*October 4, 2012*

**Intergated chemistry/physics**

A 10 pound bowling ball with a speed of 2.0 meters/second hits a 6 pound bowling ball. If the 10 pound bowling ball stops after the collision, what is the resulting speed of the 2nd ball in meters/second
*October 4, 2012*

**Intergated chemistry/physics**

A 200 man is running 3 miles per hour and collides with a 125 pound man. If the larger man transfers all of his momentum to the smaller man, will the smaller man travel slower, faster or at the same speed as the larger man?
*October 4, 2012*

**Intergated chemistry/physics**

What is the speed (in m/s) of an object that has a mass of 2.5 kilogram and a momentum of 1,000 kg m/s?
*October 4, 2012*

**Intergated chemistry/physics**

If a bowling ball is rolling at a speed of 1.5 meters/second and has a momentum of 10.0 kg m/s, what is the mass of the ball in kilograms?
*October 4, 2012*

**Intergated chemistry/physics**

Which has more momentum: a 45 gram golf ball travelling at 180 miles per hour or a 430 gram soccer ball travelling at 20 miles per hour?
*October 4, 2012*

**Intergated chemistry/physics**

What is the momentum of a 100 kilogram football player moving with a speed of 3.5 meters/second. The units should be written as kg m/s.
*October 4, 2012*

**Intergated chemistry/physics**

If you were in a car traveling 50 miles/hours, how many miles could you travel if you continued for 15 hours without stopping?
*October 3, 2012*

**Intergated chemistry/physics**

If you were in a car travelling at 50 miles/hour, how many hours would it take to get to Miami, FL from Evansville, IN? Assume that there is no stopping on the way. Miami is 1,060 miles from Evansville.
*October 3, 2012*

**Intergated chemistry/physics**

If the elevator were falling on the moon 9800 meters/second^2, what would the force be? (hint: you will need to look up the acceleration due to gravity on the moon.)
*October 3, 2012*

**Intergated chemistry/physics**

The Lamborghini Diablo sports car can accelerate from 0 kilometers/hour to 99.2 kilometers/hour in 4.0 seconds. What is the acceleration of this car in kilometers/hour^2. (hint: you must convert 4.0 seconds before putting it into the equation.)
*October 3, 2012*

**Intergated chemistry/physics**

A car is accelerated at a rate of 2.5 meters/second^2. If the starting speed is 5.0 meters/second, how many seconds will it take the car to reach a final speed of 27.0 meters/second?
*October 3, 2012*

**Intergated chemistry/physics**

A parachute on a dragster racing-car opens and changes the speed of a car from 85 meters/second to 45 meters/second. Of this car is decelerating (slowing down) at a rate of -8.9 meters/ second, how many seconds will this take?
*October 3, 2012*

**Physics**

A boat, having an initial velocity of 6.6m/s east undergoes an average acceleration of 2.2 m/s squared south for 2.5 s. Determine final velocity after the time interval (magnitute and direction)
*September 30, 2012*

**AP physics**

A particle moving uniformly along the x axis is located at 17.9 m at 1.45 s and at 3.9 m at 2.7 s. Find its displacement during this time in- terval. Answer in units of m What is the average velocity speed during this time interval. Answer in units of m/s
*September 30, 2012*

**Calculus 2**

Calculus. Mary designed a new viewing window consisting of a rectangle and a semi circle for a fresh water aquarium. The window is as follows and the top is located 10 feet below the water's surface. How much force is on the window?
*September 27, 2012*

**Calculus 2**

Calculus 2. Tom and Mike have a bet as to who will do the most work today. Mike has to compress a coil 200 feet. It takes Mike 250 lbs to compress the coil 10 feet. Tom needs to pump water through the top of a cylindrical tank sitting on the ground. The tank is half full, has ...
*September 27, 2012*

**Calculus 2**

Calculus work problem. John bought the following corner lot. Two sides are bounded by 2 roads the back is bounded by a stream that follows the curve y = -x^3 + 8. He wants to build a house in the center of the lot. Where will that be? Please show all work
*September 27, 2012*

**maths**

Daniel has a rabbit, a ferret, a gerbil, and a turtle. He feeds them in a different order each day. in how many different orders can Kelvin feed his pets?
*September 26, 2012*

**math**

jade and isis are designing a soccer uniform they want use two colors on the shirt, their choices are green , orange, yellow, purple, blue silver. how many ways can they choose two colors?
*September 26, 2012*

**Math**

A function that represents the volume of a cardboard box is V(x) = -0.65x^3 + 4x^2 + 3x, where x is the width of the box. Determine the width that will maximize the volume. What are the restrictions on the width? The answer is 4.45 and domain is 0<x<6.83
*September 25, 2012*

**Advanced Functions**

Two soccer players start at opposite sides of an 80-m field. One runs at 4 m/s and the other runs at 5 m/s. If they run back and forth for 15 mins, how many times will they pass each other? **The answer is 25 but I keep getting 45!!
*September 25, 2012*

**physics 101**

A person in an elevator is holding a 15 kg block by a cord rated to withstand a tension of 180 N. When the elevator starts up, the cord breaks. What was the magnitude of the minimum acceleration of the elevator?
*September 22, 2012*

**Physics**

A person climbs from a Paris metro station to the street level by walking up a stalled escalator in 96.5 s. It takes 60.0 s to ride the same distance when standing on the escalator when it is operating normally. How long would it take for him to climb from the station to the ...
*September 21, 2012*

**Physics**

A ball is thrown from a point 1.38 m above the ground. The initial velocity is 19.9 m/s at an angle of 33.8° above the horizontal. Find the maximum height of the ball above the ground. Calculate the speed of the ball at the highest point in the trajectory.
*September 21, 2012*

**Science**

pH of: 2.50mL of 0.100M nitric acid added to 30mL of 0.200M potassium hydroxide Please show me working out :)
*September 20, 2012*

**Algebra**

What is the square root of -25? Can you please write out the steps of finding it?
*September 13, 2012*

**chemistry**

Okay thank you for the explanation. For soduim sulfide(NaS), will it form 3 particles in solution? Na+1 and S-2 so would that give you 3? For future reference, for these problems should i first see what type of bond it creates, then if it dissolves in water to get my answer?
*September 12, 2012*

**chemistry**

how many "particles in solution" will form from each sucrose (C12H22O11) molecule added to water? Explain. I don't understand where I am supposed to start... What do I need to know to do this problem? thank you
*September 12, 2012*

**physics**

A pilot is required to fly directly from london, united kingdom to rome, italy in 3.4 hours the displacement is 1.4 x 10 ^3km [s 43 e]. the wind wind velocity reported from the ground is 55km/h [s]. determine the required velocity of the plane relative to the air
*September 10, 2012*

**MATH**

x/2 + 11 = -25 x/4 - 5 + 13
*September 6, 2012*

**math8th**

28a^11b^7 divided by 4a^3b^2
*September 5, 2012*

**English**

I am writing an essay about James Baldwin's Go Tell It on the Mountain, but the essay prompt asks me to disagree or agree with the interpretation of an critical essay we read about this book. For my essay, do I state whether I agree with the article and then use other ...
*August 31, 2012*

**math**

The teacher gave nothing and that doesn't answer my question.
*August 14, 2012*

**math**

My son is in Kindergarten and I have no idea about the "Counters" in the question: 1st) Cover the teddy bears in the top row with different-color teddy bear counters. 2nd) Color the teddy bears in the bottom row to show the colors." Help. Thanks You.
*August 14, 2012*

**Algebra**

-2(t-7)-(t+8)=8
*August 5, 2012*

**Math - Probability**

You invent a new system to make excellent racing tires for the Indianapolis 500/ Your tires are good for an average of 105 miles, with a standard deviation of 7.5 miles. What is the probability that one of your tires can go for at least 44 laps? What is the probability that ...
*July 9, 2012*

**math**

0.6 of Emily's money is €42.How much has she?
*June 18, 2012*

**chemistry**

Ok I got it. I got the correct answer. Thank you so much for explain how to start and for your help.
*June 16, 2012*

**chemistry**

My professor never teach us this kind of question before. I don't know why she put this question as a homework since she doesn't teach us this yet. I need help with one question. I don't know where to start. So don't you mind if you can help me please. Here a ...
*June 16, 2012*

**chemistry**

Yea, I realized that HH is more easy and faster. I'm going use HH better instead other way. Anyway thank you so much for explain.
*June 14, 2012*

**chemistry**

How did you get the 3.94E-10?
*June 14, 2012*

**chemistry**

No, my professor didn't teach student on Henderson-Hasselbalch equation. My professor only show us the Henderson-Hasselblach forumla but not show how to use it. Also she didn't give us what is pKa for this problem. Anyway, thank you so much for your help.
*June 14, 2012*

**chemistry**

This question I really don't get it. I tried tried tried to figure out how to start solve the problem but still couldn't figure out. So can you help me with one question PLEASE? If so, can you please explain to me how you get the answer? Also can you show me step by ...
*June 14, 2012*

**Business**

According to the doctrine of supply , the amount________ will increase as the _________decreases. I'm stuck on this question. I can't seem to find it in my text book
*June 12, 2012*

**Calculus AB...I really need help**

The region in the first quadrant enclosed by the coordinates axes, the line x=pi, and the curve y= cos(cosx) is rotated about the x-axis. What is the volume of the solid generated.
*May 28, 2012*

**algebra**

12/5+8/13 the denominators have to equal the same so you mult. 5 times 13 and 13 times 5 and the numerators too 156/65+40/65=196/65
*May 28, 2012*

**Calculus AB**

The average value of a continuous function f(x) on the closed interval [3,7] is 12. Whats the value of ∫ from [3,7] f(x) dx?
*May 28, 2012*

**Business**

In a ____________, consumers ultimately decide what should be produced
*May 25, 2012*

**physics **

For long range communication an elephant uses a low frequency rumble that is undetectable to human ears. One elephant can pick up another elephant's call from a distance of 10 km. The frequency of this rumble is about 13 Hz. How fast does the rumble travel?
*May 22, 2012*

**TRIG**

I need to state the period and 2 consecutive asymptotes on the graph for the following questions. 1: y = -3 tan pi*x period: pi (?) asymptotes: ? 2: y = 2 sec 4x period: ? asymptotes: ? 3: y = csc (x/3) period: ? asymptotes: ? 4: y = 3 cot (pi*x/2) period: ? asymptotes: ?
*May 21, 2012*

**Math- Trigonometry**

The point, in on the terminal side of an angle in standard position find the exact value of the six trigonometric functions of the angle a. (8,15) b.(-9,-40)
*May 20, 2012*

**health**

Your health care organization has called upon you to lead a work team to identify service-quality problems within the environment. Individual Portion Answer the following questions about work teams: •What are the benefits of a strong work team? •What are the common ...
*May 6, 2012*

**Chemistry 1201**

2.3
*April 15, 2012*

**precal**

A cell phone company’s profit is modeled by the function p(x) = 10x − x2 − 1, where p is expressed in thousands of dollars and x is the number of phones sold in hundreds. How many phones must the company sell to make a profit of more than $15,000?
*April 13, 2012*

**chemistry**

so i just multiply everything?
*April 13, 2012*

**chemistry**

a 5.0 g sample of ice was heated from -20.0 degrees C o 0 degrees C and remained solid. the specific heat of ice is 2.1 j/gC. How much heat did the ice absorb?
*April 13, 2012*

**geometry**

what shape is 2 units wide and 5 units long?
*April 7, 2012*

**Trig Help Please!!!**

HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
*April 5, 2012*

**statistics**

If the grades on a police entrance exam are normally distributed with a mean of 100 and a standard deviation of 15, what percentage of students received grades of less than 115?
*April 1, 2012*

**Math**

write an equation of a cosine function with Amplitude=1/2, Period=6pi, and Phase Shift=pi/3?
*March 29, 2012*

**science**

1. Two dogs are fighting over a 0.5 kg bone. The larger dog pulls on the bone in one direction with a force of 40 N. The smaller dog pulls in the opposite direction with a force of 36 N. What is the net force on the bone?
*March 29, 2012*

**business**

I just need an example, something to get me thinking in the right direction.
*March 24, 2012*

**Math**

Ok same problem too from 2015 sorry
*March 22, 2012*

**math**

find a to the nearest tenth if a= 36 degrees and c=113.5
*March 16, 2012*

**chemistry **

Mr=112.11 and 0.146mg/mL how do I change thiss to mmol/L
*March 15, 2012*

**Math**

Two numbers have a product of 3 1/5 and a sum of 3 3/5. One of the numbers is a whole number. Find the numbers.
*March 14, 2012*

**physics**

Why is there always a difference between the experimentally calcuated error for resistance, and the actual components tolerance value?
*February 15, 2012*

**Physics**

The drawing shows two fully charged capacitors (C1 = 7 µF, q1 = 4 µC; C2 = 16 µF, q2 = 4 µC). The switch is closed, and charge flows until equilibrium is reestablished (i.e., until both capacitors have the same voltage across their plates). Find the ...
*February 14, 2012*

**physics**

Assuming that it takes 0.10 s for the driver to react before applying the brakes, what is the stopping distance (the distance from the point where the driver first sees the need to stop to the point where the car comes to a stop) for a car traveling at 25 m/s if the ...
*February 13, 2012*

**chemistry**

Explain how you would prepare this solution from powdered reagents and whatever glassware you needed: 3.0 L of 1.3 M NaOH
*February 12, 2012*

**chemistry**

Explain how you would prepare this solution from powdered reagents and whatever glassware you needed: 3.0 L of 1.3 M NaOH
*February 12, 2012*

**chemistry**

Explain how you would prepare this solution from powdered reagents and whatever glassware you needed: 3.0 L of 1.3 M NaOH
*February 12, 2012*

**chemistry**

Explain how you would prepare this solution from powdered reagents and whatever glassware you needed: 3.0 L of 1.3 M NaOH
*February 12, 2012*

**Statistics**

You have a fair die. The die has a 2 on two sides, a 4 on two sides and a 6 on two sides. Note: the only possible outcomes for each roll are 2, 4 or 6. (a) Draw a tree diagram that shows the possible outcomes of rolling the die twice (my answer Roll 1: 2, 4, 6 Roll 2: 2,4,6 ...
*February 11, 2012*