Saturday

July 30, 2016
Total # Posts: 1,151

**Math **

What is the difference between Descriptive and casual studies?
*April 23, 2013*

**Math **

What is the difference between experimental and ex post facto research designs?
*April 23, 2013*

**Calculus**

Find the equation of the tangent line to the curve at the given value of t: x=sin(t); y=(cos(t))^2; t=(pi/3)
*April 16, 2013*

**Science**

1.A 2.A 3.C 4.C 5.D 6.B 7.D 8.C 9 Chemilcal I dont know if number ten is fully right but i hope it helps. 10. Color is classified as both physical and chemical properties. Color is a physical property because it is the visible light that the substance does not absorb. Color is...
*April 16, 2013*

**math**

The positive whole factors of 100 are 1, 2, 4, 5, 10, 20, 25, 50, and 100. Sum = 217
*April 16, 2013*

**Calculus**

Steve, thank you so very much!!! I am *trying* to wrap up my studying/homework and am having trouble with one more... It's asking the exact same question for the curve: x=ln(t), y=ln sqrt(t) A BIG THANK YOU AHEAD OF TIME!!!!! =)
*April 16, 2013*

**chemistry**

**compound C5H10O5 is known as ribose 175g Ribose / 150.13 g/mol Ribose = 1.16 moles ribose 1.16 * (16*5) = 92.8 grams
*April 16, 2013*

**Literature Help?**

The 2nd sentence is correct - No one likes to be uncomfortable while sleeping.
*April 16, 2013*

**Math**

A farmer is planting squash plants that need 2 3/8 feet to spread out. He has an area along a fence that is 20 feet long. Round the amount of space the squash plants need to the nearest 1/2 foot. How many squash plants can the farmer grow along the fence?
*April 8, 2013*

**English**

in #3 B?
*April 4, 2013*

**Science ASAP**

All are correct except # 10 and #14 is wrong. 10 is natural gas. Nonrenewable resources are natural gas but renewable resources are the sun, wind and all the stuff the world has cuz how ever much we use it, it never runs out but natural gas does and it take years to make more...
*April 1, 2013*

**chemistry**

The triprotic acid H3A has ionization constants of Ka1 = 9.9× 10–2, Ka2 = 2.7× 10–8, and Ka3 = 5.9× 10–11. a). Calculate the following values for a 0.0570 M solution of NaH2A H+ ?? [H2A^-/H3A]?? b). Calculate the following values for a 0.0570 M...
*March 28, 2013*

**chemistry**

Phosphoric acid is a triprotic acid with the following pKa values: pKa1=2.148 pKa2=7.198 pKa3=12.375 You wish to prepare 1.000 L of a 0.0200 M phosphate buffer at pH 7.11. To do this, you choose to use mix the two salt forms involved in the second ionization, NaH2PO4 and ...
*March 28, 2013*

**geometry**

Thank you so much
*March 21, 2013*

**geometry**

A wall pennant is in the shape of an isosceles triangle. Each of the two equal sides measures 18 in more than the third side, and the perimeter of the triangle is 54in. What are the lengths of the sides of the pennant?
*March 21, 2013*

**Chemistry**

Suppose that 10.9 mL of HNO3 is neutralized by 83.9 mL of a 0.0021 < solution of KOH in a titration. Calculate the concentration of the HNO3 solution. Answer in units of M
*March 21, 2013*

**Chemistry**

Suppose that 10.9 mL of HNO3 is neutralized by 83.9 mL of a 0.0021 < solution of KOH in a titration. Calculate the concentration of the HNO3 solution. Answer in units of M
*March 21, 2013*

**math**

Jill Ley took out a loan to pay for her child's education for $60,000. The loan would be repaid at the end of 8 years in one payment with an interest of 6 percent. The total amount Jill has to pay back at the end of the loan is: (Points : 1)
*March 18, 2013*

**Math**

Where do the perentheses go to solve this problem : 7 - 6 x 7 DEVIDE 5 + 7 = -43 2/3
*March 14, 2013*

**Physics**

h(t) = h - g/2to^2 After you drop the ball from a height of 20 feet and it hits the ground, it would reach a height of 15 ft (just multiply your h by 3/4 each time to get the heights from each time it bounces... 20 * (3/4) = 15ft
*March 12, 2013*

**Chemistry**

At a certain temperature, 0.900 mol of SO3 is placed in a 2.00-L container. 2SO3(g)<--> 2SO2(g)+O2(g) At equilibrium, 0.130 mol of O2 is present. Calculate Kc. Kc= ? Please post the answer if possible or the steps in detail; I have attempted this problem many times and ...
*March 8, 2013*

**Chemistry**

Thank you! What did you get as answers? My answers were not correct.
*March 8, 2013*

**Chemistry**

Phosphorus pentachloride decomposes according to the chemical equation: PCl5(g)<--> PCl3(g)+Cl2(g) Kc = 1.80 at 250 degrees Celsius A 0.352 mol sample of PCl5(g) is injected into an empty 4.45 L reaction vessel held at 250 °C. Calculate the concentrations of PCl5(g) ...
*March 8, 2013*

**math**

-3x+y-z=-10 -4x+2y+3z=-1 2x+3y-2z=-5 sorry.
*March 7, 2013*

**math**

solve the system of equations in three variables -3x+y-z=-10
*March 7, 2013*

**Fundamentals of math**

Thank you so much
*March 7, 2013*

**Fundamentals of math**

solve the system by substitution.. -3x-5y=-17 4x=y-8
*March 7, 2013*

**Theoretical&Experimental Probability please help!**

omg those are all wrong except number one. what the heck man. you need to study.
*March 6, 2013*

**physics**

Answer = A (1. No color, clear) Solids can be clear; ex: an ice cube Liquids can be clear; ex: water Gases can be clear; ex: Hydrogen gas Can't be #2 b/c liquids and gases do not scratch up wood. Can't be #3 b/c gases cannot and liquids do not have bumpy surfaces. Can...
*March 5, 2013*

**Chemistry**

Calculate the energy of a photon of frequency 35.0 MHz (MHz is a mega hertz or 1 x 106Hz).
*March 2, 2013*

**Trigonometry **

A water wheel has a radius of 15 ft. A river passing through the water wheel turns the wheel at 11 revolutions per minute(rpm). What is the speed of the river in miles per hour?
*February 28, 2013*

**Trigonometry **

A water wheel has a radius of 15 ft. A river passing through the water wheel turns the wheel at 11 revolutions per minute(rpm). What is the speed of the river in miles per hour?
*February 28, 2013*

**philosophy natural deduction**

1. ~(RvR) 2. I> (R*R) ~I
*February 27, 2013*

**Algebra**

I just did that question. its letter C
*February 26, 2013*

**Physics**

What can we say about the force of an object when the mass increases and acceleration remains constant?
*February 20, 2013*

**Physical Science**

A car and a truck are on the highway. Both need to accelerate at 7 m/s2 in order to avoid an accident. a. Find the force acting on the car, which has a mass of 408 k b. Find the force acting on the truck, which has a mass of 2,100 kg.
*February 20, 2013*

**Physical Science**

A force of 20 N is applied to a box of books with a mass of 4kg. Find the acceleration of the box of books.
*February 20, 2013*

**Algebra**

determine whether the pair of equations represents parallel lines 4x=5y-5 10y=10-8x
*February 16, 2013*

**physicis**

a 0.30 kg mass attached to a spring is pulled back horizontally across a table so that the potential energy of the system is increased from zero to 120 J. Ignoring friction what is the kinetic energy of the system after the mass is released and has moved to a point where the ...
*February 15, 2013*

**Physics**

At the low point in its swing, a pendulum bob with a mass of 0.2 kg has a velocity of 4 m/s What is the Kinetic at the low point? and Ignoring air resistance how high will the bob swing above the low point before reversing direction?
*February 15, 2013*

**pre algerbra**

Please solve the system with the elimination method. Explain each step as it is performed. 5y = x 2x - 3y = 7
*February 13, 2013*

**Algebra**

On a 30 day calendar which begins on a Wednesday and ends on a Thursday, what is the probability in a random drawing that the date would be a Monday?
*February 12, 2013*

**math**

sally has a bag of mixed lollies.The bag contains toffees,mints,fruit drops,smarties,jelly beans,candies and licorice.Sally allows every one in her class to choose 3 lollies,but they must not choose more than one of each kind.How many different combinations of lollies are
*February 10, 2013*

**Algebra**

I actually had -10, forgot to put it above. Thank you. I had stopped at the 44 x 10^-10 and didn't go one step further. Thanks again Reiny.
*February 6, 2013*

**Algebra**

scientific notation for (5.5*10^-8)(8*10^-2) I got (5.5*8)(10^-8*10^-2) then 44*10^10 What am I doing wrong?
*February 6, 2013*

**College Algebra**

cubic root of 27x^4 y^13
*February 6, 2013*

**algebra**

how do you solve 2w^9(5w)(4w^10)
*February 4, 2013*

**Algebra**

how do you simplify kz(k+1/z)
*February 4, 2013*

**algebra**

how to solve the formula for the indicated letter for x= w + y + z/4 for y
*February 2, 2013*

**chemistry**

determine the quantity of heat needed to convert 17.0g of solid mercury at -50.0C to mercury vapor at 25C . Specific heats: , 24.3C , , 28.0C . Melting point of hg, -38.87C . Heat of fusion, 2.33 .
*January 30, 2013*

**math**

Consider the experiment of choosing the top 7 cards from a shuﬄed deck in two ways: (a) Without replacement. 1. What is the sample space? 2. What is the probability that you get only red cards? (b) With replacement. 1. What is the sample space? What is the probability ...
*January 27, 2013*

**algebra**

Thanks ;)
*January 24, 2013*

**algebra**

Chase scored 14 points on Monday, and he doubled his score each day thereafter. How many points did he score on Thursday? A. 224 points B. 112 points C. 56 points D. 42 points Thanks :)
*January 24, 2013*

**Spanish (Please Help)**

Not always, I'm here today because I need some help on Algebra.
*January 24, 2013*

**Spanish (Please Help)**

100% Sure :)
*January 24, 2013*

**Spanish (Please Help)**

4) C. 5) B. Good Luck ;)
*January 24, 2013*

**Spanish (Please Help)**

Ok.. I'm hispanic so I'm going to help you. 1) Hago 2) Hacen 3) Hacemos
*January 24, 2013*

**statistics**

Using the fitted regression model, estimate the average change in cry time for infants with severe pain versus those without severe pain, holding group constant. Provide a 95% confidence interval for this estimate. My question: What holding group constant means?
*January 19, 2013*

**statistics**

Using the fitted regression model, estimate the average change in cry time for infants with severe pain versus those without severe pain, holding group constant. Provide a 95% confidence interval for this estimate
*January 19, 2013*

**fundamentals of math**

thanks. its been a long time for math.
*January 17, 2013*

**fundamentals of math**

if 3 is added to a number and this sum is doubled, the result is two more than the number. Find the number.
*January 17, 2013*

**maths**

integrate by parts integrate (4+x^2)^1/2
*December 29, 2012*

**english**

has anyone read the women in black???? chapter two-a london particular i need to compare the atmosphere at the begging of chapter one to chapter two and the quote is "it was monday afternoon in november and already growing dark
*December 27, 2012*

**maths**

Express sin 2x cos 4x as a sum of trigonometric functions.
*December 23, 2012*

**algebra URGENT!**

Solve the system using elimination. 2x – 2y = –8 x + 2y = –1 And this one: Solve the system using elimination. 3x – y = 28 3x + y = 14 Pleease help me :(
*December 21, 2012*

**I NEED HELP!.. Algebra**

Find a solution to the following system of equations. -5x + y = -5 -4x + 2y = 2
*December 21, 2012*

**algebra**

Hey, I dont undertand how to solve this equation using substitution. 3y = -1/2x + 2 y= x + 9
*December 21, 2012*

**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*