Sunday

May 1, 2016
Total # Posts: 2,563

**calculus**

what is the derivative of: V(t) = 130sin5t + 18
*March 11, 2011*

**Chemistry**

Why is potassium hydrogen phthalate (KHP) a primary standard but sodium hydroxide is not?
*March 9, 2011*

**Calculus**

how do I solve for t when i am given: 5000 = 45t^2 + 240t + 450
*March 7, 2011*

**algebra**

A triangle has sides of lengths 20, 28, and 32. A similiar triangle has a side of length 15 and another of length 24. How long is the third side of this triangle?
*March 5, 2011*

**Calculus 1**

find the point on the graph of y=x^2 where the tangent line is parallel to the line 2x-y=2
*March 5, 2011*

**math**

720/36=20 sq. in.
Let's say the original painting was 24x30"
24/6=4
30/6=5
4*5=20 sq. in., so the answer checks out!!
*March 4, 2011*

**College Alegbra**

Thanks for the help.
*March 3, 2011*

**College Alegbra**

1/4,16
*March 3, 2011*

**College Alegbra**

Solve: 2x-9√x +4=0
*March 3, 2011*

**math**

Explain vertices and edges
*March 2, 2011*

**math**

Explain vertices and edges
*March 2, 2011*

**microeconomics**

lol mayybe... did you get the answer?
*March 2, 2011*

**microeconomics**

Consider the markets for pizza and fried chicken. Show graphically and explain the impact(s) you would expect if technological change leads to the development of a pizza oven that is both much cheaper and uses less energy than current ovens.
*March 2, 2011*

**microeconomics**

What condition must be met in order to conclude that an economy is maximizing social well-being? Do the equilibriums given by individual markets necessarily lead to the maximization of social well-being (that is, if demand is equal to supply, can you conclude that well-being ...
*March 2, 2011*

**7th grade math**

x-14=-3 one step equation
*March 2, 2011*

**math**

Use integration by parts to verify |(from -pi to +pi)cosmxcosnxdx = pi when m=n and |(from -pi to +pi)cosmxcosnxdx = 0 when m and n are not equal.
*March 2, 2011*

**math**

integration of x^2 * cos^2(x)
*February 27, 2011*

**Chemistry**

Which of the following aqueous solutions are good buffer systems ? . 0.26 M hydrochloric acid + 0.24 M potassium chloride . 0.14 M acetic acid + 0.20 M potassium acetate . 0.16 M potassium hypochlorite + 0.23 M hypochlorous acid . 0.31 M hydrocyanic acid + 0.28 M potassium ...
*February 26, 2011*

**Math**

Write 1.87 as a mix number
*February 24, 2011*

**Business Communication**

I agree
*February 24, 2011*

**physical science**

If 22 grams of water are saturated at 75 degrees celsius with potassium nitrate and then cooled to 40 degrees celsius, how much will precipitate?
*February 21, 2011*

**Calculus II**

Find the volume of the solid formed by rotating the region enclosed by x=0, x=1, y=0,y= 6 +x^{8} about the y-axis.
*February 20, 2011*

**algebra**

Mat116 appendix F problem #2 2. As you are leaving the community, you notice another new community just down the street. Because you are in the area, you decide to inquire about it. a. The sales representative here tells you they also have two floor plans available, but they ...
*February 16, 2011*

**chemistry**

A sample containing 0.0500mol of Fe2(SO4)3 is dissolved in enough water to make 1.00L of solution. This solution contains hydrated SO4 2- and Fe(H2O)6 3+ ions. The latter behaves as an acid: Fe(H2O)6 3+ --> Fe(H2O)5OH 2+ + H+ a) Calculate the expected osmotic pressure of ...
*February 16, 2011*

**physics**

6/12
*February 16, 2011*

**physics lab**

Consider different points along one spoke of a wheel rotating with constant angular velocity. Which of the following is true regarding the centripetal acceleration at a particular instant of time? A The magnitude of the centripetal acceleration is greater for points on the ...
*February 16, 2011*

**English**

1.It was so cold that the water in the fountain had _____. (freeze) 2.Masato's bike has _____ on the sidewalk all day. (lie) 3.Shelia has never ____ a mountain bike. (ride) 4.Last sprin Urbi and Joe _____ every morning. (swam) 5.Has the rider been _____ off the horse?(...
*February 14, 2011*

**8th Grade Probability**

12/5
*February 14, 2011*

**Math**

Factor Completey: f(x)= x^7 +2x^6 -8x^5 -10x^4 +19x^3 +8x^2 -12x
*February 14, 2011*

**algebra**

Why does the inequality sign change when both sides ar multiplied or divided by a negative number?
*February 9, 2011*

**statistics**

76% of toddlers get their immunization. Suppose that 6 toddlers are selected at random. What is the probability that at least one has not received the recommended immunization?
*February 8, 2011*

**Physics**

zero work, no force in direction of motion
*February 7, 2011*

**Energy and momentum Physics**

two cars, one with mass m1=1000kg and the other with mass m2= 4000kg crash in an intersection. Before the crash, car m1 was headed east with a speed of v1i= 25 m/s and the car m2 was headed north with a speed of v2i= 10m/s. After the crash, the cars stick together. what is the...
*February 3, 2011*

**Math**

That was a huge help. Thank you!!!
*February 3, 2011*

**Math**

Karen can be paid in one of two ways for selling insurance policies: Plan A:A salary of $750 per month, plus a commission of 10% of sales. Plan B:A salary of $1000 per month, plus a commission of 8% of sales in excess of $2000. For what amount of monthly sales is plan A better...
*February 3, 2011*

**essay writing**

rong i put that as my answer and it was rong
*February 3, 2011*

**Math**

Could someone please help me solve this problem, the age numbers that I am working with are 10yrs old 55yrs old and 75yrs. old. I need to know at my age of 55, in years, how old was the older person of 75 when I was born? Could you please write an equation that models how old ...
*February 3, 2011*

**math**

actually dont answer that im stupid. i hand by calculator in rad rather than deg. sorry. have a great rest of the day.
*February 3, 2011*

**math**

a boy walks 50m from the bottom of a building lies down and notes that he has to raise his eyes through 42 degree from the horizontal. what is the height of the building? i am doing tan(42)=x/50 but the answer is supposed to be 45m. how do i get that?
*February 3, 2011*

**algebra**

-7x-22=-24 1/3 could someone help me Im confussed
*February 1, 2011*

**us history**

what issues did the compromise of 1850 leave unsettled
*January 26, 2011*

**please help me paraphrase**

"The truth is that the reader is always right. Chances are, if something you’re reading doesn’t make sense, it’s not your fault—it’s the writer’s. And if something you write doesn’t get your point across, it’s probably not the ...
*January 25, 2011*

**Biology **

Thank you so much! I will check with my teacher tomorrow. That's what i though it would be but wasn't sure. Thanks again!
*January 23, 2011*

**math**

radius of 4 centimeters and length of 12 centimeters, how many cubic centimeters?
*January 23, 2011*

**math**

a bag contains 12 black checkers and 12 red checkers. What is the probability of choosing two red checkers?
*January 23, 2011*

**Chemistry**

thank you so very much this helped so much!!!!!
*January 23, 2011*

**Chemistry**

What is the pH of a one liter auqueous solution to which has been added 0.2 moles of acetic acid (CH3COOH)?
*January 23, 2011*

**5th grade **

Easily done the mode is 600 b/c the mode is the most #'s in the sequence
*January 20, 2011*

**physicis**

what action on our part is neccesary to make the dryiceblock move faster and faster,that is accelerate continuosly?if you are speeding it up, how must you move?
*January 20, 2011*

**physicis**

suppose the dry ice block is moving to begin with and we exert a steady force,either speeding up or slowing down.how does the block behave? now suppose we make the steady force smaller and smaller.how does the dryice block behave? how will it behave when the force we are ...
*January 20, 2011*

**physicis**

What is dry ice behavior when acted on by a steady push that keeps up with the block and when it is a given a quick shove.
*January 20, 2011*

**trig**

i have to find a & c, b=2.489*10 to the nineth power and i have one degree 25
*January 18, 2011*

**thermodynamic**

A heat pump is proposed that uses 50 degree F ground water to heat a house to 70 Degree F. The groundwater experiences a temperature drop of 12 degree F. If the house require 75,000 Btu/hr, Calculate the minimum mass flux of the groundwater and minimum HP required for the pump.
*January 16, 2011*

**thermodynamic**

Calculate the work necessary to compress air in an isolated cylinder with initial and final volumes of 6.0 and 1.2 ft^3, respectively. The initial pressure and temperature are 30.0 psia and 50 degree F, respectively.
*January 15, 2011*

**thermodynamic**

An air tank with a volume of 20m^3 is pressurized to 10 MPa. The tank eventually reaches room temperature of 25 degree C. If the air inside is allowed to escape without any heat transfer to the environment unit reaches a pressure of 200 KLPa, find the remaining mass of air in ...
*January 15, 2011*

**Early ed**

The most important consideration when installing playground equipment is? A. Cost B.height C.finishing materials D. Surface materials
*January 12, 2011*

**Conductivity**

I still don't understand. Can someone help, and elaborate more?
*January 12, 2011*

**Trigonometry**

If log base 9 of 2 = 3x+1, find x to the nearest tenth.
*January 12, 2011*

**algebra**

simplified x/2-1/3=1/2
*January 12, 2011*

**Algebra 2**

10x+ (x^2) = 42
*January 10, 2011*

**Math**

Paul's car is 14 feet long. Paul is making a model of his car that is the actual size. Which proportion should be used to find the length, L, of Paul's model?
*January 10, 2011*

**Thermodynamic**

One Kg steam with a quality of 0.2 is heated in a piston / cylinder vessel at a constant pressure of 200 KPa unit the temperature reaches 400 degree C. calculate the work done by the steam.
*January 10, 2011*

**Thermodynamic**

N2 is described by its state properties of temperature @ - 100 Degree C, and pressure @10.0 MPa. Determine if it is reasonable to assume that the given substance behaves as an ideal gas at the specified state. If the substance is determined as a real gas or non-ideal substance...
*January 10, 2011*

**MATH!! probability**

Two cards are drawn without replacement from a deck of 52 cards. Determine P(A and B) where A : the first card is a spade B: the second card is a face card please help!!
*January 9, 2011*

**thermodynamic**

The air 10 cm diameter cylinder, as shown below, is heated until the spring is compressed 50mm. Find the work done by the air on the frictionless piston. The spring as the beginning of this process has a displacement of 0.0m with a spring constant of K=10KN/m. (assume Patm=101...
*January 9, 2011*

**accounting**

What potential problems can arise if a company incorrectly classifies costs? Example, what if an inventoriable cost is classified as a period cost?
*January 9, 2011*

**thermodynamic**

The air 10 cm diameter cylinder, as shown below, is heated until the spring is compressed 50mm. Find the work done by the air on the frictionless piston. The spring as the beginning of this process has a displacement of 0.0m with a spring constant of K=10KN/m. (assume Patm=101...
*January 9, 2011*

**thermodynamic**

Energy is added to a piston-cylinder arrangement. The piston is withdrawn in such a way that the temperature remains constant. The initial pressure and volume are 200 KPa and 2m^3, respectively. If the final pressure is 100 KPa, determine the work done by the ideal gas on the ...
*January 9, 2011*

**Physics**

The mass of the hockey puck is 185 grams. When you said time = distance/average speed stopping, in the equation F = m (46.473)*(23.236/.0439), did you mean this, .0439/23.236.
*January 8, 2011*

**Physics**

A player strikes a hockey puck giving it a velocity of 47.673 m/s. The puck slides across the ice for 0.175 s after which time its velocity is 46.473 m/s. The acceleration of gravity is 9.8 m/s2 . If the puck strikes the goalie’s pads and stops in a distance of 4.39 cm, ...
*January 8, 2011*

**thermodynamic**

N2 is described by its state properties of temperature @ -100 degree C, and Pressure @ 10.0 MPa. Determine if it is reasonable to assume that the given substances behaves as a real or non-ideal substance determine its compressibility factory Z.
*January 8, 2011*

**thermodynamice**

A cylinder contain 3 kg of water and water vapor mixture in equilibrium at a pressure of 500 KN/m^2. If the volume of the cylinder is 1.0 m^3, calculate the following. A)temperature of the mixture B) the volume and mass of the liquid C)The volume and mass of the vapor
*January 8, 2011*

**Physics**

You are driving at the speed of 33.4 m/s (74.7296 mph) when suddenly the car in front of you (previously traveling at the same speed) brakes. Considering an average human reaction, you press your brakes 0.484 s later. Assume that the brakes on both cars are fully engaged and ...
*January 8, 2011*

**Physics**

You are driving at the speed of 33.4 m/s (74.7296 mph) when suddenly the car in front of you (previously traveling at the same speed) brakes. Considering an average human reaction, you press your brakes 0.484 s later. Assume that the brakes on both cars are fully engaged and ...
*January 8, 2011*

**english**

I need help determining the key differences between the four types of writing (summary, analysis, synthesis and evaluation).
*January 8, 2011*

**7th grade math**

6+x=2x-14 -x = -x 6=x-14 6+14=+14 20=x
*January 6, 2011*

**Science**

what forces would be at work if you were trying to move a 20,000kg block of stone? Withoust using a cart or truck, how could you move the stone?
*January 5, 2011*

**English 1**

Underline the correct pronoun of each pair in parentheses. 1. Women (who, whom) raise families do as much work at home as at their jobs. Whom 2. In North America society, it is still mainly women (who, whom) cook dinner, clean the house, check the children’s homework, ...
*January 4, 2011*

**geometry**

If the smaller leg of a 30-60-90 triangle is 4 m, what are the lengths of the longer leg and the hypotenuse?
*January 2, 2011*

**English 1**

Revise the mixed sentences so that the beginning of each sentence fits logically with its end. If sentence is correct cirle it. 4. While following an object with her eyes is when eye coordination develops When following an object with her eyes is when eye coordination ...
*December 31, 2010*

**English 1**

Revise the mixed sentences so that the beginning of each sentence fits logically with its end. If sentence is correct cirle it. 1. By showing babies plain, black-and-white images will help them learn to recognize shapes and focus their vision. Showing babies plain, black-...
*December 31, 2010*

**English 1**

Revise the mixed sentences so that the beginning of each sentence fits logically with its end. If sentence is correct cirle it. 1. By showing babies plain, black-and-white images will help them learn to recognize shapes and focus their vision. 2. Babies can see their parents&#...
*December 31, 2010*

**English (Shifting and mixed sentences)**

1. By showing babies plain, black-and-white images will help them learn to recognize shapes and focus their vision. 2. Babies can see their parents’ faces but will not respond with a smile until they are a few weeks old. 3. Babies may gaze intently into a small, ...
*December 30, 2010*

**English 1**

Through changing his facial expression indicates he may find a particular sound soothing or comforting.
*December 30, 2010*

**5th grade**

divide 6358 by 100
*December 27, 2010*

**pre calculus**

Write the trigonometric expression in terms of sine and cosine, and then simplify. cot(x)/csc(x)-sin(x)
*December 16, 2010*

**geometry**

if triangle FGH~ to Triangle PQR, FG = 6, PQ = 10 and the perimeter of trinagle PQR is 35 find the perimeter of triangle FGH
*December 13, 2010*

**us history`**

township
*December 12, 2010*

**English**

Thanks that makes since to be now. Let me try a few more that can be either just to make sure I understand. 1.All of the actors (knows, know) their lines. 2. Most of the plants (needs, need) water. 3.Now more of the waiters (seems, seem) busy. 1.plural=know 2.plural=need 3....
*December 8, 2010*

**English**

Can you please explain how none is singular in sentence #1? I know that all, any, more, most, none, and some may be either singular or plural, depending on their meaning in a sentence.
*December 8, 2010*

**English**

1.plural=has 2.singular=is
*December 8, 2010*

**English**

1. None of the guests (has, have) left. 2. Each of these apples (is, are) ripe. 3.One of my favorite songwriters (is, are) Billy Joel. 4.Some of my cousins (has, have) come to my party. 5.All of the bread (was, were) eaten. Tell if the indefinite pronoun is singular or plural ...
*December 8, 2010*

**English**

1.Everyone in the club (has, have) read this book. 2.Most of the field (needs, need) mowing. Tell if the indefinite pronoun is singular or plural. Then choose correct word in () 1.singular=has 2.singular=needs
*December 8, 2010*

**5th grade**

Ther is no mode
*December 8, 2010*

**math **

60 boys 80 girls
*December 7, 2010*

**algebra**

The natural stride up a certain staircase has a slope of 3/5, meaning that a run of 5 inches has a rise of 3 inches. The model for a standard staircase is y=(3/5)x Find the rise for a staircase constructed at a mansion which has a run of 12 inches. Not sure how to set equation up
*December 7, 2010*

**Chemistry**

A 0.5962g sample of iron ore is dissolved in acid producing Fe3+. Through a series of reactions, the iron precipitates as the Fe(OH)3. The precipitate is heated, forming solid Fe2O3. What is the mass % of iron in the sample if the analysis produced 0.3210g Fe2O3?
*December 6, 2010*

**11th grade**

From what i see your trying to convert 4000 grams of fe203 to moles, and then multiply the find the amount of fe203 in 3 moles of co2. So your answer would be 4000*3/ 159.68 = 75.2 mole of co2 .
*December 2, 2010*

**English**

1.He lived with his parents, brothers, and sisters. 2.Those in this small Mexican American community were worried and frightened. 3.That was the time when Cesar Chavez first lived among the migrant workers. 4.Chavez became a spokesperson for poor farmworkers. 5.In 1962, he ...
*November 30, 2010*

**5th grade math**

The number of pages is a 2-digit number. the number of photos on a page is a 1- digit number. the number of pages is 60 more than the number of photos on a page. the number of pages is divided by the number of photos on a page is 16. What is the number of pages?????????
*November 30, 2010*