# Posts by SARA

Total # Posts: 4,531

**Chemistry**

Looks like 0.046 mol NH4OH. So, I just multiply the moles and liters and then compare the two values? The balanced equation isn't really necessary?

**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..

**Algebra Answer ASAP thx!**

Numer 58- 5m6 -------=1.6 3n 5m63n1.6

**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}. {...

**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(&#...

**math question**

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

**History**

Thanks

**History**

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

**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

**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 ...

**Life skills**

Why and how someone would prioritize their values?

**History**

is it the first?

**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

**art**

where is the negative space in the rubin case?

**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.

**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....

**Calculus**

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

**Calculus**

because f'(0)=2cos(0)=2?

**Calculus**

how is the slope of 2sinx=2?

**Calculus**

i found the derivative to be y'=2cosx but i don't know what to do next

**Calculus**

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

**Calculus**

Thanks!

**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...

**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

**Calculus**

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

**Calculus**

would the derivative of f(x)=(7^x)(x^7) be f'(x)=(7^x ln7) (7x^6)?

**Calculus**

Ah i see thanks!

**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&#...

**Calculus**

How would I answer this question? Differentiate the function f(x)=sqrt(cosxsinx)

**Calculus**

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

**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)?

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

thanks!

**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 ...

**math calculus**

Oh I wrote the question incorrect. It's not to find the difference but to explain the difference between the two functions

**math calculus**

Oh ok! so 2^x is the inverse of (1/2)^x

**math calculus**

what is the difference between the function 2^x and (1/2)^x?

**calculus- min value of function**

thanks!

**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

**core values**

I need some example of personal core values?

**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?

**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 ...

**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 ...

**science**

what is true about red blood cells

**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)

**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?

**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.

**math**

A video game Is On sale For 30% Off The rehilarious price Of $50. What Is The sale price Of The video game?

**home economics**

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

**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...

**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

**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

**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 ...

**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...

**Grammar**

is it # 3

**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?

**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

**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 ...

**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 don't know what to do next. For example: NaH2PO4= acidic soln Mg(HSO4)2= neutral soln Ca(CN)2= basic soln NH4F= acidic soln

**Equation7**

Thanks

**Equation7**

C=65

**Equation7**

2/5c+4/5c-6=c+7 6/5c=c-13 5/5c=-13 C=-13

**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.

**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...

**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 don't know what to do next. For example: NaH2PO4= acidic soln Mg(HSO4)2= neutral soln Ca(CN)2= basic soln NH4F= acidic soln

**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? ...

**History**

What are some views of Machiavelli's theory on political leadership?

**Art**

I looked at the website but i still don't get it

**Art**

define two color schemes that a color wheel could help you identify.

**History**

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

**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...

**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 ...

**AP Phsychology**

Why and how do memories change over time?

**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 ...

**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...

**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...

**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.

**Geography**

How can I make a power line for my geo model?

**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 ...

**chemistry**

wright college

**math**

20

**Math**

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

**chemistry**

How to prepare 250.0 mL of 0.076M NaOH?

**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 ...

**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.

**calc**

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

**U.S. History**

I cant find any statistics with in my text book related to that question. And I don't know what year they were asking for since they don't mention it1

**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?

**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?

**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 ...

**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?

**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 ...

**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 ...

**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 ...

**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 ...

**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 ...

**chemistry**

How many milliliters of 0.413 M NaC2H3O2 are needed to supply 27.3 g NaC2H3O2?

**science**

What r 4 alkali's that u would find in the house????? Luv Sara xxxx

**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 (...

**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

**Science? Help**

Can someone explain this please because Ms. Sue's !@#$%^&ty links to nowhere don't help