Wednesday

July 1, 2015

July 1, 2015

Total # Posts: 4,083

**Chemistry**

If I have 50.0 mL of HA at a concentration of 1.20M and 50.0 mL of NH4OH at a concentration of 0.92M, how many moles of the limiting reactant are there? I guess I should start with a balanced equation, but I have no idea where to start..
*March 1, 2015*

**Math**

Find the intersection of the sets A = {3, 4, 7, 9, 13} and B = {3, 7, 10, 13, 17}. null set {3, 7, 13} {3, 4, 7, 9, 10, 17} {3, 4, 7, 9, 10, 13, 17}--- my answer Question 3.3. Choose the correct answer. Find the union of the two sets A = {4, 8, 10, 12, 14} and B = {12, 14}. {...
*February 26, 2015*

**math**

let V be the set of all real-valued continuous functions defined on R1. If f and g are in V, we define f ¨’ g by (f ¨’ g)(t) = f(t) + g(t). If f is in V and c is a scalar, we define c f by (c f)(t) = cf(t). Then V is a vector space, which is denoted by C(&#...
*February 26, 2015*

**math question**

how is this not a subspace of R3? The set of all vectors of the form a b c , where a > 0.
*February 26, 2015*

**History**

Thanks
*February 26, 2015*

**History**

What do we mean when we say the modern world? When did it begin? How is it different from the pre-modern world?
*February 26, 2015*

**Chemistry Pre-AP**

What volume of oxygen gas can be collected at 0.565 atm pressure and 48.0◦C when 42.9g of KClO3 decompose by heating, according to the following equation? 2 KClO3(s) ∆−−−−→2KCl(s) + 3O2(g) MnO2
*February 25, 2015*

**AP Chemistry**

iN A LAB, the orders of two reactants, A and B, were determined experimnetally to be 2 and 3 respectively. a. write the rate law for this reaction. c. what would happen to the rate of the reaction if A were Doubled? d. what would happen to the rate of the reaction if B were ...
*February 24, 2015*

**Life skills**

Why and how someone would prioritize their values?
*February 23, 2015*

**History**

is it the first?
*February 23, 2015*

**History**

Which was not a motivation for European exploration in the fifteenth and sixteenth centuries? the Muslim invasion of Spain the desire to find a sea route to Asia-} my answer the promise of riches intellectual curiosity
*February 23, 2015*

**art**

where is the negative space in the rubin case?
*February 23, 2015*

**Chemistry**

Using household bleach and saltwater of the same molarity, describe the quantities of each that would me needed to make 30 ml of a solution that contained 50% of the hypochlorite in household bleach.
*February 22, 2015*

**statistics**

Estimate the multiple linear regression equation relating number of cups of coffee per week, female sex, and number of hours of exercise per week, considered simultaneously, to GPA. Consider GPA the dependent, or outcome variable. my answer: GPA= 7.301 -1.649 (female sex) -0....
*February 20, 2015*

**Calculus**

also, how is y=2x? did you use y=mx+b? which numbers did you substitute?
*February 17, 2015*

**Calculus**

because f'(0)=2cos(0)=2?
*February 17, 2015*

**Calculus**

how is the slope of 2sinx=2?
*February 17, 2015*

**Calculus**

i found the derivative to be y'=2cosx but i don't know what to do next
*February 17, 2015*

**Calculus**

Find an equation of a line tangent to y = 2sin x whose slope is a maximum value in the interval (0, 2π]
*February 17, 2015*

**Calculus**

Thanks!
*February 15, 2015*

**Calculus**

determine the absolute extreme values of the function f(x)=sinx-cosx+6 on the interval 0<=x<=2pi. This is what i did: 1.) i found the derivative of the function which is f'(x)=cosx+sinx 2.) I set f'(x)=0 and got sinx/cosx=-1 which is tanx=-1 and then x=3π/4...
*February 15, 2015*

**Calculus**

Can someone please explain how to solve this type of question? Determine the maximum and minimum value of the function f(x)=3x3^x - 1
*February 14, 2015*

**Calculus**

ok thanks! Also, how did you simplify it to (7^x)(x^6) (7 + x ln7) ?
*February 14, 2015*

**Calculus**

would the derivative of f(x)=(7^x)(x^7) be f'(x)=(7^x ln7) (7x^6)?
*February 14, 2015*

**Calculus**

Ah i see thanks!
*February 14, 2015*

**Calculus**

a certain radioactive substance is decaying so that at time t, measured in years, the amount of the substance, in grams, is given by the function f(t)=3e^-3t. What is the rate of decay of the substance after half a year: I first found the derivative of f(t)=3e^-3t which is f&#...
*February 14, 2015*

**Calculus**

How would I answer this question? Differentiate the function f(x)=sqrt(cosxsinx)
*February 13, 2015*

**Calculus**

1.)sorry i meant to put x not z. so 9x. 3.)yes it is a stair case exponent
*February 13, 2015*

**Calculus**

1. is the derivative of the function f(x)=5e^(4x-9z) f'(x)= -25e^(4x-9z)? 2. Is the derivative of the function f(x)=e^(2x)-e^(-2x) f'(x)=2e^(2x)+2e^(-2x)? 3. If f(x)=e^-x^-1, would f'(2)=-1/4e^(1/4)?
*February 13, 2015*

**Calculus help and please check answer for a)**

thanks!
*February 13, 2015*

**Calculus help and please check answer for a)**

The decay of a certain substance is modeled by the function N(t)=100(3+e^(-t/3), where the number of particles is represented by N in a time of t hours. a) what is the initial number of particles? - I set t as 0 and got an answer of 400 particles initially b) determine the ...
*February 13, 2015*

**math calculus**

Oh I wrote the question incorrect. It's not to find the difference but to explain the difference between the two functions
*February 13, 2015*

**math calculus**

Oh ok! so 2^x is the inverse of (1/2)^x
*February 13, 2015*

**math calculus**

what is the difference between the function 2^x and (1/2)^x?
*February 13, 2015*

**calculus- min value of function**

thanks!
*February 13, 2015*

**calculus- min value of function**

The answer is -1/2 but how? Which of the following is the minimum value of the function f(x)= sinxcosx? a) 0 b) -1/2 c) -1 d) does not exist
*February 13, 2015*

**core values**

I need some example of personal core values?
*February 13, 2015*

**Calculus**

when I drew a curve through the scatter plot, i did get an exponential decay model. would that be all I would need for the justification part?
*February 13, 2015*

**Calculus**

I am not too sure if I did this question correct. Thanks in advanced! Data table: Time after Consumption (min): 30 60 90 120 150 180 Amount of Codeine in Blood (mg): 27.0 23.5 21.2 18.7 16.6 14.5 1.) create a scatter plot of the data and determine a suitable equation to model ...
*February 13, 2015*

**Calculus**

I am not too sure if I did this question correct. Thanks in advanced! Data table: Time after Consumption (min): 30 60 90 120 150 180 Amount of Codeine in Blood (mg): 27.0 23.5 21.2 18.7 16.6 14.5 1.) create a scatter plot of the data and determine a suitable equation to model ...
*February 12, 2015*

**science**

what is true about red blood cells
*February 11, 2015*

**Math**

Place grouping symbols in the expression so that it has a value of 22. 3 • 4 – 2 + 5 + 7 3 • [4 – (2 + 5) + 7] (3 • 4) – [2 + (5 + 7)] [(3 • 4) – 2] + (5 + 7) 3 • (4 – 2) + (5 + 7)
*February 10, 2015*

**Chemistry **

Upon decomposition, one sample of magnesium fluoride produced 1.55 kg of Magnesium and 2.42 kg of fluoride. A second sample produced 1.10kg of magnesium. How much fluoride (in grams) did the second sample produced?
*February 5, 2015*

**Math**

formalize the following statment: a_n is a sequence that doesnt converge to L∈R. prove that the sequance (1/n) does not converge to 1. Can someone please explain to me what i have to do in the question i do not understand it so well.
*February 2, 2015*

**math**

A video game Is On sale For 30% Off The rehilarious price Of $50. What Is The sale price Of The video game?
*January 25, 2015*

**home economics**

Please help me!,how is home economics related to mathematics,science and social,spiritual and moral education (ssme)?
*January 24, 2015*

**applied math**

You are wallpapering a 10-foot long wall. The wall is 10 feet high, and without doors and windows. The solid-colored wallpaper you've selected is 30 inches wide and comes in 20-foot rolls. How many widths of paper will it take to cover the wall? How many rolls of wallpaper...
*January 23, 2015*

**Math**

A triangle is graphed in the coordinate plane. The vertices of the triangle have coordinates (5, 1), (1, 1), and (1, 7). What is the perimeter of the triangle? 28 24 14---- my answer 10
*January 23, 2015*

**Science plz help**

Explain the basic parts of a major theme in molecular biology: the pathway of DNA to RNA to proteins. Include a general idea of what occurs at each stage
*January 23, 2015*

**english**

How does Kurt Vonnegut address the concept of equality differently in “Harrison Bergeron” than Martin Luther King Jr. does in “Letter from Birmingham Jail”? What relationship does Vonnegut’s story show between equality and personal freedom/individual ...
*January 22, 2015*

**english check?**

In “Harrison Bergeron,” Kurt Vonnegut’s purpose is to show readers (Points : 5) the danger of letting extremely strong people have freedom. the value of keeping all people at the same level of potential and achievement. the ugliness of violent revolt in the face...
*January 22, 2015*

**Grammar**

is it # 3
*January 22, 2015*

**Grammar**

Choose the sentence that uses pronouns correctly. Who would you choose as your mentor?---my answer Do you remember whom signed his name very large on the Declaration of Independence? Whom made this wonderful dinner? Have you met the people who are visiting next door?
*January 22, 2015*

**check?**

what does regional designs do? depends on designs from previous eras reflects the lifestyle of the area often features distressed furniture is harder to find materials for than other style
*January 21, 2015*

**check?**

1. Using the same shape of furniture is an example of which of the following? modern ----- my answer sleek uniform colonial 2. Taking exact measurements of a room is not as important as choosing a style that the client likes. True False ---- my answer 3. Why can trendy items ...
*January 21, 2015*

**Chemistry**

How would you know if a salt will produce a neutral, acidic or basic solution? I am quite confused. I know you first break them up into their ions but I dont know what to do next. For example: NaH2PO4= acidic soln Mg(HSO4)2= neutral soln Ca(CN)2= basic soln NH4F= acidic soln
*January 20, 2015*

**Equation7**

Thanks
*January 20, 2015*

**Equation7**

C=65
*January 20, 2015*

**Equation7**

2/5c+4/5c-6=c+7 6/5c=c-13 5/5c=-13 C=-13
*January 20, 2015*

**Biology**

Which of the following is true about DNA? It is a single-stranded molecules Only one of the original DNA strands acts as a template during replication. Both of the original DNA strands act as templates during replication. Its replication takes place in the cytosol.
*January 20, 2015*

**Mendelian Genetics**

Assume you are performing a cross between a plant that is heterozygous for the dominant traits red flowers and wrinkled seeds, with a plant that is homozygous for the recessive traits white flowers and smooth seeds. Assume the alleles are R for red flowers, r for white flowers...
*January 20, 2015*

**Chemistry**

How would you know if a salt will produce a neutral, acidic or basic solution? I am quite confused. I know you first break them up into their ions but I dont know what to do next. For example: NaH2PO4= acidic soln Mg(HSO4)2= neutral soln Ca(CN)2= basic soln NH4F= acidic soln
*January 20, 2015*

**Science**

A certain species of grasshopper can have red stripes, yellow stripes, or red and yellow stripes. An RR grasshopper has red stripes, an YY grasshopper has yellow stripes, and an RY grasshopper has red and yellow stripes. Which type of inheritance is this an example of? ...
*January 20, 2015*

**History**

What are some views of Machiavelli's theory on political leadership?
*January 20, 2015*

**Art**

I looked at the website but i still don't get it
*January 18, 2015*

**Art**

define two color schemes that a color wheel could help you identify.
*January 18, 2015*

**History**

what are two themes that would be appropriate for thematic time lines of important events from prehistory to A.D.1600.
*January 18, 2015*

**Math**

1. A bag contains red, blue, green, and yellow marbles. Seth takes a marble from the bag without looking, records the color of the marble, and then puts the marble back in the bag. He repeats the process until he has recorded the colors of 35 marbles. The chart below shows the...
*January 15, 2015*

**Alegebra**

A box contains 10 cards numbered 1 through 10. Which events are mutually exclusive? (Points : 4) A card is drawn from the box and the number is even. A card is drawn from the box and the number is 8. A card is drawn from the box and the number is odd. A card is drawn from the ...
*January 15, 2015*

**AP Phsychology**

Why and how do memories change over time?
*January 13, 2015*

**PHYSICS**

in a car, you drive from your home 4 km to the gas station, 8 km to the shopping mall to let your mother off, and 8.9 km back home. The trip takes 20 min. What is your velocity? So I got 17.4 m/s but my teacher told me that the velocity is actually 0 m/s, can someone explain ...
*January 13, 2015*

**PHYSICS! **

A 3.0 g coin moving to the right at 27.0 cm/s makes an elastic head-on collision with a 20.0 g coin that is initially at rest. After the collision, the 3.0 g coin moves to the left at 12.5 cm/s. (b) Find the amount of kinetic energy transferred to the 20.0 g coin. I found part...
*January 7, 2015*

**English **

Can some one please tell me if these are assertive,non-assertive,or aggressive. and give me an example how i would write each sentence with the ones that its not. 1. You never return my phone calls. 2. I am not sure when I can meet. I'm pretty busy. 3. If we take the two o...
*January 3, 2015*

**Biology**

Photosynthesis and cellular respiration are often described in two ways: (1) they are chemically opposite; and (2) they have a relationship to each other. Explain what these two statements mean. I need help with this please.
*January 1, 2015*

**Geography**

How can I make a power line for my geo model?
*December 28, 2014*

**Social Commentary**

The civil rights movement consisted of many events, such as freedom rides and sit-ins. Some of the events, such as fires and murders, were violent and unsettling. But the killing of the four little girls in Birmingham is considered one of the most significant events. Why do ...
*December 23, 2014*

**Math**

Juan has DVDs 9/16 inches wide. How many DVDs wil fit on one shelf that's 1 3/4 wide
*December 14, 2014*

**chemistry**

How to prepare 250.0 mL of 0.076M NaOH?
*December 9, 2014*

**general physics**

An axle of a mass of 10 kg, length 10 cm and radius .1 m is free to rotate about the axis which runs the length of the axle, throuhh it's center. A chain of mass 4kg is fastened to the axle at one end, wound exactly 6 times around the axle, and a rock of mass 1.8 kg ...
*December 9, 2014*

**calc**

I am having trouble taking the first integral. I get y^2/2 (x+y+1)^3/2 (1) is this correct? or do I take the integral of the inside instead of the derivative.
*November 30, 2014*

**calc**

evaluate the surface integral double integral (y dS) z= 2/3 (x^3/2 + y^3/2) 0 ≤ x ≤ 5, 0 ≤ y ≤ 2
*November 30, 2014*

**U.S. History**

I cant find any statistics with in my text book related to that question. And I dont know what year they were asking for since they dont mention it1
*November 25, 2014*

**U.S. History**

Yes that would be the answer for the year 2014 but there is no year mentioned in that question and my textbook is from 2002?
*November 25, 2014*

**U.S. History**

Approximately ___ of the country's adult population has Internet access. a. one-third b. two-thirds c. one-quarter d. three-quarters Would it be answer B?
*November 25, 2014*

**U.S. History**

Not being sovereign, it does not call the United States of America a "nation" or "government," but instead says, "The said States hereby severally enter into a firm league of friendship with each other, for their common defense, the security of their ...
*November 24, 2014*

**U.S. History**

All of them were weaknesses, however the way it was mentioned in most texts it that there was no national judiciary therefore I was thinking maybe its answer C?
*November 24, 2014*

**U.S. History **

which of the following was not a weakness of the articles of confederation (1781-1789)? A) a week "league of friendship" among the states B) the requirement of unanimous approval by all 13 states for amendments C) no judicial branch D) no congressional power to ...
*November 24, 2014*

**now mr. damon, physics**

A 63.8 kg block of silver is at initially at 107 C. 1.0 kg of ice at its freezing point is placed onto the block to cool it. As the ice melts, the water is free to flow off (so that the water never increases in temperature). After all the ice melts, what is the final ...
*November 24, 2014*

**physics (would mr. sue or mrs damen answer my ques**

A 63.8 kg block of silver is at initially at 107 C. 1.0 kg of ice at its freezing point is placed onto the block to cool it. As the ice melts, the water is free to flow off (so that the water never increases in temperature). After all the ice melts, what is the final ...
*November 24, 2014*

**physics, please help**

A 63.8 kg block of silver is at initially at 107 C. 1.0 kg of ice at its freezing point is placed onto the block to cool it. As the ice melts, the water is free to flow off (so that the water never increases in temperature). After all the ice melts, what is the final ...
*November 24, 2014*

**physics**

A 63.8 kg block of silver is at initially at 107 C. 1.0 kg of ice at its freezing point is placed onto the block to cool it. As the ice melts, the water is free to flow off (so that the water never increases in temperature). After all the ice melts, what is the final ...
*November 24, 2014*

**chemistry**

How many milliliters of 0.413 M NaC2H3O2 are needed to supply 27.3 g NaC2H3O2?
*November 23, 2014*

**science**

What r 4 alkali's that u would find in the house????? Luv Sara xxxx
*November 23, 2014*

**programming**

would someone be able to give me an idea of how to start coding this in C? You just finished playing cards with a group of friends and each time your score changed in the game you wrote it down. Given the total number of points it takes to win the game and all of your scores (...
*November 20, 2014*

**Math, Please Help!**

If 99 people had a mean income of $45,000, how much is the mean income increased by the addition of a single income of 250,000
*November 19, 2014*

**physics grade 11**

1) In 2011, the total of all residential customers in Halton Region used 54 540 000 m3 of water. Halton Region has a population of around 500 000 people and Milton (part of Halton Region) has a population of around 85 000 people. Assuming all people in Halton use the same ...
*November 16, 2014*

**physics**

1) In 2011, the total of all residential customers in Halton Region used 54 540 000 m3 of water. Halton Region has a population of around 500 000 people and Milton (part of Halton Region) has a population of around 85 000 people. Assuming all people in Halton use the same ...
*November 16, 2014*

**physics**

1) In 2011, the total of all residential customers in Halton Region used 54 540 000 m3 of water. Halton Region has a population of around 500 000 people and Milton (part of Halton Region) has a population of around 85 000 people. Assuming all people in Halton use the same ...
*November 15, 2014*

**physics**

1) In 2011, the total of all residential customers in Halton Region used 54 540 000 m3 of water. Halton Region has a population of around 500 000 people and Milton (part of Halton Region) has a population of around 85 000 people. Assuming all people in Halton use the same ...
*November 15, 2014*

**physics**

1) In 2011, the total of all residential customers in Halton Region used 54 540 000 m3 of water. Halton Region has a population of around 500 000 people and Milton (part of Halton Region) has a population of around 85 000 people. Assuming all people in Halton use the same ...
*November 15, 2014*