Sunday

August 28, 2016
Total # Posts: 953

**Calculus**

What is the total change of f(x), if f'(x) = 2x - 3x^2, over the interval [0, 3]?
*June 9, 2014*

**Calculus**

The rate of change in the volume of a tank is known to be dV/dt=0.6t*cos(0.08t^2 -1), where V(t) is in gallons per minute and 0<=t<=10 (0 is less than or equal to t which is less than or equal to 10). If the tank has a volume of 14 gallons initially, what is its volume ...
*June 8, 2014*

**Calculus**

So the answer would be -cos(2)+4=4.416?
*June 7, 2014*

**Calculus**

An object with an initial position of x(0) = 3 has a velocity of v(t) =sin(t). Find its position at t =2.
*June 7, 2014*

**calc**

The base of a three-dimensional figure is bound by the line y = 6 - 2x on the interval [-1, 2]. Vertical cross sections that are perpendicular to the x-axis are rectangles with height equal to 2. Find the volume of the figure. The base of a three-dimensional figure is bound by...
*June 6, 2014*

**math**

Assume a cube with all sides equal to x. Let the change in x with respect to t; x(t) = 2t + 1. What is the formula for the rate of change of the volume of the cube?
*June 6, 2014*

**Spanish**

Bonito should be bonita and señor should be señora. I think i get it. In English you would just call someone American, but in Spanish you have to identify if they are a man or women so you would say Americano and Americana. Thank you so much!!
*June 4, 2014*

**Spanish**

I'm doing my work but i don't get these three questions at all. Could you explain them as well? ★Which part of this sentence is not correct? Esta muchacha tan bonito es alta. A. Esta B. bonito ✔C. muchacha ★Choose the correct verb for tastes in the ...
*June 4, 2014*

**statistics**

A sample of n= 4 scores has SS equals 48 what is the estimated standard error for the sample mean
*May 31, 2014*

**English Lit**

Is it biased?
*May 27, 2014*

**English Lit**

Help I have no clue!!! A novel is an example of what type of source? Secondary, biased, tertiary, primary
*May 27, 2014*

**Math**

Q1. A population has a mean of µ = 80 with σ = 20. a. If a single score is randomly selected from this population, how much distance, on average, should you find between the score and the population mean? 20 because the standard deviation is 20 b. If a sample of n...
*May 27, 2014*

**English**

4 Is not grammatically correct it would be I want to learn how to drive.
*May 27, 2014*

**HELP!!!! MATH**

thank you! I guess I did it wrong
*May 22, 2014*

**HELP!!!! MATH**

A boat drops an anchor to the bottom of a lake. The anchor rope makes a 15 degree angle with the boat. The anchor rope is 24 feet long. How deep is the lake to the nearest foot?
*May 22, 2014*

**math**

A boat drops an anchor to the bottom of a lake. The anchor rope makes a 15 degree angle with the boat. The anchor rope is 24 feet long. How deep is the lake to the nearest foot?
*May 22, 2014*

**math**

756
*May 21, 2014*

**biology**

which of the following is not a part of the theory of evolution
*May 13, 2014*

**Chemistry**

Ahh!! Sorry for the grammar errors. :/ I was typing on my phone...thank you so much DrBob222! ^^ Do you think you might be able to explain how the reactants resulted into such a product for problem #6 and 7? I will presume problem #5 is a double replacement?
*May 10, 2014*

**Chemistry**

How would you write these chemical reactions?Can someone do one or two reactions for each problem, so I could get an idea of to them? ..I'm nit sure how most of the oeoducts wouls turn out..especially if it is a precipitate. 5. When Mn^2+ ions are separated from the ...
*May 10, 2014*

**Spanish Proofreading**

I haven't been able to meet with my Spanish professor to go over my short composition (it basically had to be a past narration using only the preterite and imperfect). If any Spanish speakers wouldn't mind reading it and letting me know what I need to correct that ...
*May 4, 2014*

**Spanish Proofreading**

Thank you so much for your help! I just have one more question. I changed "teníamos mucho de diversión" to "nos divertíamos mucho cuando estábamos jugando en la nieve". Does that look correct? I was trying to add a little bit of ...
*May 4, 2014*

**Spanish Proofreading**

Ok, thank you!
*May 4, 2014*

**Spanish Proofreading**

I haven't been able to meet with my Spanish professor to go over my short composition (it basically had to be a past narration using only the preterite and imperfect). If any Spanish speakers wouldn't mind reading it and letting me know what I need to correct that ...
*May 4, 2014*

**Math**

Last week we talked about Order of Operation or (PEMDAS) and this week we are solving Linear Equations. Is there any relation to the two practices? Think about it, are the processes similar? Is the process reversed? I think that there is a relation between the two but I just ...
*May 1, 2014*

**Health**

C Higher
*April 17, 2014*

**chemistry**

What is the difference between the speed of a moving object and its velocity?
*April 10, 2014*

**Math **

To win a certain board game, a tossed token must land on a shaded square on the board. The probability of winning is approximately 23%. If the board has a total area of 130 congruent squares, how many of these squares are shaded?
*April 8, 2014*

**chemistry**

I got it! Nevermind! I just was assuming the wrong equation went to completion! Thank you for asking me to type it out! It definitely helped me! :)
*April 3, 2014*

**chemistry**

And then the KF reaction will go to completion because it is completely soluable!
*April 3, 2014*

**chemistry**

Oh! I think I just caught my mistake...HF is a weak acid, so that reaction does not go to completion....
*April 3, 2014*

**chemistry**

the formatting is a little off, I'm so sorry. Let me know if you need me to re-type it.
*April 3, 2014*

**chemistry**

I tried to find the numbers I need for the HH equation, and I can't seem to find the correct way to use my chemical equation to find them. H+ + KF -> HF + K+ .01 .005 0 0 -.005 -.005 +.005 +.005 .005 0 .005 .005 <moles left at equilibrium KF <-> F- + K+ 0 0 ....
*April 3, 2014*

**chemistry**

calculate the pH of the solution when 100mL of .05M KF is mixed with 200mL of .05M HF; Ka (HF) = 3.467x10^-4. I tried to use the Henderson Hasselbach equation to get the correct answer (pH=3.16) but can't seem to get it correct. Any help would be AMAZING! Thank you in ...
*April 3, 2014*

**chemistry**

I'm stuck on this problem and only have 2 attempts left. The Ksp of Zn(OH)2 is 1.8x10^-14. Find Ecell for the following half-reaction. Zn(OH)2(s) + 2e^- <-> Zn(s) +2OH^-(aq) So far I've tried using the following methods, none of which have worked... Ecell = (0....
*April 2, 2014*

**Algebra II**

Graph the following inequalities y<2x-9 y=>-5x+3
*April 2, 2014*

**Algebra II**

Flying against the wind, a jet travels 3220 miles in 7 hours. Flying with the wind, the same jet travels 2820 miles in 3 hours. What is the rate of the jet in still air and what is the rate of the wind?
*April 2, 2014*

**Chemistry**

"Determine the volume of a 0.925M K2Cr2O7 solution required to completely react with 5.28g of Cu." My attempted method for solving was to convert the 5.28g of Cu to moles, find moles of K2Cr2O7 using the mole to mole ratio, and then use M=mol/L to solve for volume. ...
*March 26, 2014*

**Chemistry**

"Determine the volume of a 0.925M K2Cr2O7 solution required to completely react with 5.28g of Cu." My attempted method for solving was to convert the 5.28g of Cu to moles, find moles of K2Cr2O7 using the mole to mole ratio, and then use M=mol/L to solve for volume. ...
*March 26, 2014*

**health**

Its D. Might not make sense but thats what this mess of a test wanted.
*March 26, 2014*

**algebra 2**

Identify the form of the equation (standard, vertex, intercept), tell if it opens up or down and give the axis of symmetry. y=-4x^2+3x+-6 Walk me through this please?
*March 25, 2014*

**General Chemistry **

A piston has an external pressure of 7.00 atm. How much work has been done in joules if the cylinder goes from a volume of 0.130 liters to 0.650 liters. Express your answer with the appropriate units.
*March 20, 2014*

**chemistry**

Just as I thought, it was much easier than I was making it out to be haha Thank you!
*March 19, 2014*

**chemistry**

I feel like this question is pretty easy, but I can't seem to figure out how to go about solving it. It's like the solution is on the tip of my tongue: Nitromethane (CH3NO2) burns in air to produce significan amounts of heat. 2 CH3NO2(l) + 3/2 O2(g) -> 2 CO2(g) + 3 ...
*March 19, 2014*

**Physics**

A piece of metal has a mass of 85 cg and a volume of 450L. What is it's density in g/cm3?
*March 5, 2014*

**Physics**

how many centimeters long is the proverbial "10-foot pole?"
*March 5, 2014*

**Physics**

A satellite that is 4175 miles from the center of the earth, orbits with a period of 90 minutes. What is its centripetal acceleration?
*March 5, 2014*

**Physics**

You throw a ball horizontally off a building with a horizontal velocity of 10m/s. What is the ball's horizontal velocity 5 seconds later. What is the ball's vertical velocity 5 seconds later?
*March 5, 2014*

**AED**

This is the first page of what I found at National Access Network website. 1 SOUTH DAKOTA Char Gatje, Director of Research South Dakota Education Association I. GENERAL BACKGROUND State The current state aid formula was passed by the 1995 legislature and is based on a per ...
*March 4, 2014*

**AED**

I am a little confused on how I go about writing these? Go to the National Access Network website and review the educational funding issues for South Dakota. Try to find information about the affect of school choice options on educational funding. From DQ 1, describe how ...
*March 4, 2014*

**statistics**

When calculating a confidence interval for the difference between two means, what information are you gaining? The means are from both same population and different? Thank you.
*February 28, 2014*

**Statistics**

When calculating a confidence interval for the difference between two means, what information are one gaining?
*February 28, 2014*

**Statistics**

A report says that the between-subjects factor of participants’ salary produced significant differences in self-esteem. (a) What does this tell you about the design? (b) What does it tell you about the results?
*February 26, 2014*

**Statistics**

A report says that the between-subjects factor of participants’ salary produced significant differences in self-esteem. (a) What does this tell you about the design? (b) What does it tell you about the results? 19.(a) Source Sum Squares df Mean Square F Between 134.800 3 ...
*February 26, 2014*

**Statistics in Psychology**

Please Help! For the following, which type of t-test is required? (a) Studying the effects of a memory drug on Alzheimer’s patients, testing a group of patients before and after administration of the drug. (b) Studying whether men and women rate the persuasiveness of an ...
*February 26, 2014*

**Statistics**

Summarize the steps involved in analyzing the results of a one-sample experiment.
*February 23, 2014*

**chemistry**

I got 30 this time! Yay! Thank you so much DrBob222! I really appreciate it!
*February 13, 2014*

**chemistry**

I got 23...but the answers available are a. 10 mL b. 30 mL c. 50 mL d. 100 mL ... is there something that I am doing incorrectly?
*February 13, 2014*

**chemistry**

An ice-bath made with sodium chloride will be 9 ± 1 oC when the solution is about 23% sodium chloride by mass. The density of solid sodium chloride is about 2 g/cm3. What volume of solid NaCl would you add to 200 g water to make a 23% NaCl solution? ANY HELP WOULD BE ...
*February 13, 2014*

**Statistics**

If the population is normally distribution then the sample must be normally distributed even for small sample size? True or False. The variance of the standard normal distribution is always equal to 1.? True or False. A continuous random variable may not be normally ...
*February 7, 2014*

**Statistics**

A salesperson goes door-to-door in a residential area to demonstrate the use of a new Household appliance to potential customers. She has found from her years of experience that after demonstration, the probability of purchase (long run average) is 0.30. To perform ...
*February 7, 2014*

**Statistics**

A salesperson goes door-to-door in a residential area to demonstrate the use of a new Household appliance to potential customers. She has found from her years of experience that after demonstration, the probability of purchase (long run average) is 0.30. To perform ...
*February 7, 2014*

**physics**

One gram of nickel has 1.026 × 1022 atoms, and each nickel atom has 28 electrons. How many electrons are contained in 6.00 g of nickel? The elemental charge is 1.6 × 10−19 C. Answer in units of electrons
*February 7, 2014*

**chemistry**

2)Tf = (0.00089 +/- 0.00008) * (13 +/- 2) + (19.627 +/- 0.004) Tf = (0.012 +/- 0.002) + (19.627 +/- 0.004) Tf = 19.639 +/- what value?
*February 7, 2014*

**physics Work unit**

1. A football player pushes a tackle dummy forwards at a constant 0.85m/s for 11m using 7150J of energy. The tackling dummy mass is 120kg. a) find force the player exerts? b) what is the frictional force the dummy exerts? c) what work is done by the friction as the dummy is ...
*February 1, 2014*

**Physics Work unit**

1. A football player pushes a tackle dummy forwards at a constant 0.85m/s for 11m using 7150J of energy. The tackling dummy mass is 120kg. a) find force the player exerts? b) what is the frictional force the dummy exerts? c) what work is done by the friction as the dummy is ...
*February 1, 2014*

**Math**

4 because l.c.m. of 6 & 8
*January 28, 2014*

**Chem**

Calculate the pH of a solution obtained by mixing 50 mL of 0.75 M CH3COOH with 15 mL of 1.6 M NaOH. (Ka of CH3COOH is 1.8 x 10-5)
*January 23, 2014*

**Elementary Math**

I just told my little boy to do 15.4 x .7 and he got 10.78
*January 2, 2014*

**Math**

Thanks so much!!
*December 10, 2013*

**Math**

Sugar comes in 2 pound bags and flour comes in 5 lb bags. Thomas bought 3 more bag of sugar than flour and the total weight was 48 pounds. How many bags of sugar and flour did Thomas buy?
*December 10, 2013*

**Physics**

A. 0.60 B. 20.69 C. 0.048
*December 10, 2013*

**math**

A statistic professor plans classes so carefully that the lengths of her classes are uniformly distributed between 46.0 and 56.0 minutes. Find the probability that a given class period time is less than 51.75 minutes
*November 29, 2013*

**Statistics**

A statistics professor plans her classes so carefully that the lengths of her class are uniformly distributed between 46.0 and 56.0 minutes. Find the probablity that given class period runs less than 51.75 minutes
*November 27, 2013*

**Algebra 1 (Reiny or Kuai)**

jason wants to buy his brother a comic book. If he buys it online it costs $3.50, but if he buys it in the store there is a 20% markup. How much does the comic book cost in the store?
*November 4, 2013*

**Math**

1/4
*October 29, 2013*

**edu 650**

The idea of Gardener’s theory of multiple intelligences suggests that there are specific intelligences that are inherent in all individuals. The author, however, suggests that a preferred style may not necessarily be the best way an individual learns. With that in mind, ...
*October 21, 2013*

**Math**

A baseball pitcher has pitched a total of 25 innings so far during the season and has allowed 18 runs. At this rate, how many runs, to the nearest hundredth, would he allow in nine innings? This number is called the pitcher’s earned run average, or ERA. b. Randy Johnson ...
*October 7, 2013*

**Chemistry**

I am trying to figure out the molecular, ionic, and net equation for this question. HCl reacts with the precipitate formed from mixing Ni(NO3)2 and NaOH . This is what I got for the molecular but it is saying it wrong. Please help. Thank you. HCl(aq) + Ni(NO3)2(aq) + NaOH(aq...
*October 5, 2013*

**Math HELP!!**

The water level of a lake decreases by 6 inches over 3 years. What is the mean yearly change in the water level?
*September 23, 2013*

**health help!!!!!!**

should be c
*September 12, 2013*

**Chemistry**

Please explain how what the X g NaCl should be? I am not following this completely! Thanks I got the answer for mass of H20 to be 9.337*10^23 g
*September 8, 2013*

**Chemistry**

If the volume of ocean water 7.41*10^20 L contains 2.9 percent sodium chloride ("salt") by mass and the density of the water is 1.26 g/mL, calculate the total mass of sodium chloride. (1 ton = 2000 lb, 1 lb = 453.6 g) Calculate the mass of sodium chloride in kg
*September 8, 2013*

**algebra**

when sandy looked out at the school parking lot,she noticed that for ever 9 minivans there were 5 other types of vehicles.If there were 168 vehicles in the parking lot,how many of them are not minivans?
*August 27, 2013*

**Physics**

A uniform beam of length L = 7.80 m and weight 4.05 102 N is carried by two workers, Sam and Joe, as shown in the figure below. Determine the force that each person exerts on the beam. (Sam is 1m from one end of beam and joe is 2m from the opposite end.)
*July 30, 2013*

**CHEM**

how many moles of oxygen are present in 11.0 molecules of NaClO4? AND HOW DO I WORK IT OUT
*July 18, 2013*

**math**

3/4-1/2n=4/5 Please don't give me the answer, just show me the steps to solve it
*July 15, 2013*

**math**

-6=4x/7+2
*July 15, 2013*

**algebra**

perform the subtraction (8a+2b)/(8a^(2)+2ab-3b^(2))-(a+2b)/(16a^(2)-ab^(2))
*July 5, 2013*

**Physics**

A 39.2-kg boy, riding a 2.39-kg skateboard at a velocity of +4.97 m/s across a level sidewalk, jumps forward to leap over a wall. Just after leaving contact with the board, the boy's velocity relative to the sidewalk is 6.48 m/s, 9.54° above the horizontal. Ignore any ...
*June 30, 2013*

**health**

how do you lose weight
*June 27, 2013*

**math**

Yes, painting can be 12 to 14 inches . Lengths do not matter . Thank you
*June 2, 2013*

**math**

Want to hang a painting on a wall that is 17and 5/8 inches high and I want 2 inches left on top and bottom of painting showing. Where would I hang it at?
*June 2, 2013*

**Chemistry**

Say you have a question asking to rank the oxidizing strength of several different metals. When you look at the reduction table to determine the strength, there are metals with different oxidation states. For example: Fe3+ + 3e- => Fe ; Eo = -.04 Fe2+ + 2e- => Fe ; Eo...
*May 21, 2013*

**Math**

A squirrel is moving at a speed of 15 feet per second. At this rate, how long will it take the squirrel to travel one mile? Convert answer into minutes, to the nearest tenth.
*May 9, 2013*

**algebra**

A satellite dish has a parabolic cross section and is 6 ft deep. The focus is 4 ft from the vertex. Find the width of the satellite dish at the opening. Round your answer to the nearest foot. Thank you
*May 1, 2013*

**Math**

He was not late to the bus stop because 8:15 is just the digital way to say quarter after 8
*April 22, 2013*

**Statistics**

A high school counselor is interested in the percentage of students who will be going to college. She randomly picks 60 students and finds that 53 will be going to college. Use a 95% confidence level to find the population proportion. a) State the 95% confidence interval for ...
*April 17, 2013*

**Statistics**

A purchasing agent at the Kelly Bread Company wants to estimate the mean daily usage of rye flour. She takes a sample for 50 straight days and finds that the sample mean is 180 pounds with a sample standard deviation of 38.5 pounds. a) State the 90% confidence interval for the...
*April 16, 2013*