# Posts by Sierra

Total # Posts: 297

**Science**

teamwork is dreamwork

*December 15, 2016*

**algebra**

graph y=/x/-2

*November 29, 2016*

**algebra 2**

Let f(x)=5x^3-2x and g(x)=3x^3.Preform the operation given and state the domain. A. F(x)+ g(x) B. F(x) - g(x) C. F(x) • g(x) D. F(x) / g(x) E. f(g(x)) F. g (f(x)

*November 7, 2016*

**HELP HISTORY**

they are both right

*November 1, 2016*

**Math**

The country hall charges a rental fee of $1000 and at least $3000 for food. Olivi is planning a class reunion. If she had chosen a buffet that costs $38.56 per person what is the minimum possible number of people who must attend to support the expense?

*October 29, 2016*

**geography**

the c0orn belt of the united states stretches from Ohio to Nebraska.

*October 18, 2016*

**Social studies 8 A Connections academy.**

I did it is right

*October 6, 2016*

**Social studies 8 A Connections academy.**

The answers 1 C 2 A 5 A and C 6 C 7 D 8 C 9 A

*October 6, 2016*

**Social studies 8 A Connections academy.**

1 What was the initial purpose of the Constitutional convention? To write the constitution To amend the constitution To amend the Articles of confederation <--- To ratify the constitution 2 What fundamental problem did Noah Webster see in the articles of confederation? That...

*October 6, 2016*

**math**

typo, i think it's just meant to say the sums of the equations

*May 25, 2016*

**math**

7x + 5 8x + 9 find the value of x so that both the sum of the equations equal 180 when added together.

*May 25, 2016*

**Algebra**

I lined up all of my pet snakes. The two pythons are 6 feet each. I also have three corn snakes that are all the same length. Altogether, my snakes total 21 feet. A. How long is one of the corn snakes? B.Write an equation that models this situation. Thank you teachers so much ...

*April 26, 2016*

**math**

write an algebraic or numeric expression for the following:Take away 30 from j

*April 25, 2016*

**Algebra**

Thats what Im confused about I have to explain WHY the above equation is incorrect, in complete sentences. Before, I asked why this is wrong, the question states Nelson says the equation to find how many cookies are in each bag is 4*c=36. Nelson is wrong. Now I have to explain...

*April 25, 2016*

**Algebra**

I have 6 bags with the same number of cookies. Altogether I have 36 cookies.The equation to find out how many cookies are in each bag is 4*c=36. Why is this wrong?

*April 25, 2016*

**Chemistry**

Radium-223 has a half-life of 11.4 days. Approximately how long would it take for the activity of a sample of 223Ra to decrease to 2.00 % of its initial value?

*April 7, 2016*

**Art**

Thanks

*April 7, 2016*

**Art**

what value is most likely encouraged when citizens look at the rising eagle on the unit state dollar bill? Wisdom Patriotism Endurance Creativity I think either wisdom or patriotism

*April 7, 2016*

**Chemistry**

what volume of 1.00M ca(oh)2 is needed to neutralize 250.0mL of 0.100M HCL?

*April 6, 2016*

**Chemistry**

What volume of 1.00M ca(oh)2 is needed to neutralize 250.0mL of 0.100M HCL?

*April 5, 2016*

**Physics**

you strike a huge spring at a speed of 30m/s while strapped in a steel cage. When you hit the spring with combined mass of 320kg it is compressed 9.0m. A) What is the spring constant of the spring? B) How long are you in contact with the spring before it bounces off in the ...

*February 22, 2016*

**Physics**

So you chose to use a solid sphere and you give it a speed of 5.9m/s on a flat horizontal surface which is the speed it has when it reaches a 22degree incline. A) How far along the incline will it go?

*February 22, 2016*

**science**

convert your answer from 3 to meters per second.

*February 11, 2016*

**Language Arts**

Thanks

*January 15, 2016*

**Language Arts**

Choose the meaning that best matches the word in capitals: The president of the large company felt as if he had reached the PINNACLE of his career. A. lowest point B. pointed or towering formation C. highest point of achievement** D. rise toward success or fame I think it is C

*January 15, 2016*

**Health**

I think it's c

*December 15, 2015*

**math**

The property taxes on a business office were $3000. What was the tax rate if the business office was valued at $200,000?

*December 11, 2015*

**Math**

First year students at a particular college must take one English class, one class in mathematics, a first year seminar, and and elective. There are 2 English class to choose from, 3 mathematicss classes, 5 electives, and everyone takes the same first year seminar. Represent ...

*October 22, 2015*

**Algebra**

(10 in):(150 ft)=(10 in):(150*12 in)= 1:180

*October 6, 2015*

**english**

in line 16of "The Nymph's reply to the shepherd" in what ways does the speaker's word choice reveal a striking balance of opposite to illustrate the theme of the harmful effects of time?

*September 16, 2015*

**math**

A number is multiples by 6 and that product is added to 3 the sum is equal to the product of 3 and 11 find the number

*September 16, 2015*

**AP Chemistry**

An ore contains Fe3O4 and no other iron. The iron in a 39.3-gram sample of the ore is all converted by a series of chemical reactions to Fe2O3. The mass of Fe2O3 is measured to be 10.6 g. What was the mass of Fe3O4 in the sample of ore? Answer in units of g

*September 7, 2015*

**Math 7**

Thanks

*May 25, 2015*

**Math 7**

A photo studio offers different sized prints of the same subject. The original print measures 8 inches by 10 inches. A printer enlarges the orginal the orginal by a scale factor of 1.5, and then enlarges the second image by a scale factor of 3. What are the dimensions of the ...

*May 25, 2015*

**science**

@mariana do you know the rest of the answers ?

*April 29, 2015*

**Math**

Each human hand has 27 bones. There are 6 more bones in the fingers than in the wrist. There are 3 fewer bones in the palm than in the wrist. How many bones are in each part of the wrist?

*April 26, 2015*

**History**

I am having a hard time with this question and where to look for the answer. How might the cultures of Latin America be different if the spanish and portugese never arrived? Also what kind of culture do you think would dominate today?thanks

*April 15, 2015*

**calculus**

The operating cost, C, in dollars per hour, for an airplane cruising at a height of h metres and an air speed of 200km/h is given by: C = 4000 + h/15 + 15000000/h for the domain 1000 ≤ h ≤ 20000. Determine the height at which the operating cost is at a minimum, and...

*March 31, 2015*

**math help**

my bad, the 1.5 should be positive! so y=1.5 and x=0.5

*March 31, 2015*

**math help**

You have to isolate one variable in the first equation first because its easier, then substitute it into the second one: x=2-y Now plug this in for x in the second equation: 3(2-y)^2+4(2-y)y+y^2=6 Now solve for y, then plug your answer back into: x=2-y 3(2-y)(2-y)+8y-4y^2+y^2=...

*March 31, 2015*

**Earth Space Science**

the horizontal distance between a crest to the next trough of an ocean wave is 5 meters. what is the wavelength of the ocean wave? A)2 meters B)5 meters C)10 meters D)20 meters I think its 10 meters but im not so sure, I would like to make sure.

*March 28, 2015*

**Science**

which of these statements provides evidence to the fact that oceans influence climate by transporting water from one place to another? A)warm ocean water off the east coast of Florida affects the climate of Europe. B)warm ocean water off the east coast of Florida affects the ...

*March 28, 2015*

**Science**

Salinity of the ocean A)is generally very low B)changes with climate C)decreases with increase in temperature D)increases where a river meets the ocean I think its A but I'm not sure I just want to make sure.

*March 27, 2015*

**English**

Thank you

*March 27, 2015*

**English**

Hello, can you check with me to see if this answer is correct to this question. What does scrooge mean by these lines in a Christmas carol Act two scene four? Spirit this is a fearful place, in leaving it, I shall not leave its, lesson, Trust me let us go. Answers are; I am ...

*March 27, 2015*

**Statistics**

A student guesses blindly on a 20-question multiple choice test. If each question has 4 answer choices (only one of which is correct), what is the probability that the student will answer exactly 10 questions correctly?

*February 20, 2015*

**physics**

A horizontal force of 150 N is used to push a 45.0-kg packing crate a distance of 5.75 m on a rough horizontal surface. If the crate moves at constant speed, find each of the following. (a) the work done by the 150-N force (b) the coefficient of kinetic friction between the ...

*February 17, 2015*

**algebra**

A school has a classroom with a length eight feet less than twice the width. If a group of parents purchased 400 square feet of carpet for the room, what is the approximate length of the room? L=2W-8 L*W=400 (2W-8)W=400 2w^2-8w=400

*February 10, 2015*

**7th grade math**

Thanks

*February 4, 2015*

**7th grade math**

The sum of an integer and the next greater integer is at the most 13. Write an inequality to find the lesser integer and solve for the lesser integer. My answer n+n+1 <_ 13 n<_6

*February 4, 2015*

**College Algebra**

Allison drove home at 65 mph, but her brother Austin, who left at the same time, could drive at only 41 mph. When Allison arrived, Austin still had 144 miles to go. How far did Allison drive?

*January 29, 2015*

**Art**

Did you get this right.?

*January 29, 2015*

**Math**

Thanks for breaking it down.

*January 14, 2015*

**Math**

A true crab has 4 fewer than twice the number of legs that a hermit crab has. The hermit crab has 6 legs. How many legs does the true crab have? I put for the equation 4c =6 *2 I am confused

*January 14, 2015*

**Math**

Thanks, I got 160

*January 14, 2015*

**Math**

160

*January 14, 2015*

**Math**

An annual pass covering entrance fees to more than 2000 national parks cost $80. If the total income from the annual passes is $12,800 in one month. Write the equation and solve it. For my equation I put 12800p=80

*January 14, 2015*

**Math**

Thanks a lot

*January 13, 2015*

**Math**

Is the answer x= 3500

*January 13, 2015*

**Math**

1400= 2/5x X= 7000 I took 1400 times 5

*January 13, 2015*

**Math**

Thanks a lot

*January 12, 2015*

**Math**

Which expression represents the difference of (3y+2)-(y-1)? I put 2y+ 3 for my answer.

*January 12, 2015*

**Math**

Thanks

*January 12, 2015*

**7th grade math honors**

Thanks a lot

*January 12, 2015*

**Chemistry**

I got 5.6 Thanks

*January 11, 2015*

**Chemistry**

I really don't understand this problem? Is there a simpler way to do this? Thanks

*January 11, 2015*

**Chemistry**

find the mass in grams of 1.40x10^23 molecules of n2

*January 11, 2015*

**Chemistry**

Thanks

*January 10, 2015*

**Chemistry**

72 is my answer

*January 10, 2015*

**Chemistry**

What is the mass of 1.00 mol of sodium hydrogen carbonate?

*January 10, 2015*

**Chemistry**

6.25 percent is my answer Thanks a lot for helping me

*January 10, 2015*

**Chemistry**

What is the percent by mass of hydrogen in aspirin C2H8O4?

*January 10, 2015*

**chemistry**

That's very helpful! Thank you!

*November 24, 2014*

**chemistry**

I just need a definitive answer because I've searched everywhere and it's made me second guess my original answer. How many valence electrons does copper have? I thought it was one but now I'm unsure. I know it's electron configuration is [Ar]4s1 3d10, so that...

*November 24, 2014*

**chemistry**

Because I had to convert kJ to J So I did: 1312200/2(6.022x10^23) 6.626x10^-34(3x10^8)/ans and then that answerx 10^9 to convert to nm Where did I go wrong because that answer wasn't correct =(

*November 18, 2014*

**chemistry**

Ok that's what I thought! So my answer should be 182.45 nm, yes?

*November 18, 2014*

**chemistry**

Wait, what's planck's equation??

*November 18, 2014*

**chemistry**

Experimentally the ionization energy of hydrogen is 1312.2 kJ / mol. What would be the wavelength (nm) of a photon with enough energy to ionize one atom of hydrogen? They give the equation E=hcR but those are all known constant values and none include mols so I'm very ...

*November 18, 2014*

**History**

What are some aspects of the modern American political party system that began during the Jackson era? A.beginnings of political action committees and fundraising B.widespread campaigns for the popular vote, including fliers, slogans, and songs C.of campaign tours and town ...

*November 10, 2014*

**chemistry**

Hemoglobin is the oxygen carrying molecule of red bloods and contains 4 atoms of iron per molecule of hemoglobin. A sample of hemoglobin weighing 13.4 g contains 45.6 mg iron. What is the molecular mass of hemoglobin? I'm unsure of where to begin with this problem. I know ...

*October 24, 2014*

**Language Arts**

Dipper pines is right I just got 100% thank you

*October 23, 2014*

**COLLEGE PHYSICS**

7500J=1/2(M2V^2) +1/2(1.5M2)(V^2) 7500J=1/2 (M2V^2+1.5M2V^2) 15000=M2V^2+1.5M2V^2 15000= X+1.5X 15000=X(2.5) 6000=X 6000 = X = M2V^2 1/2(6000) = KE 3000 = KE TOTAL PE (7500J) - KElargerobject(3000) = 4500J (KE smaller object)

*October 22, 2014*

**COLLEGE PHYSICS**

7500J = KE1 + KE2

*October 22, 2014*

**physics**

A circular curve of highway is designed for traffic moving at 93 km/h. Assume the traffic consists of cars without negative lift. (a) If the radius of the curve is 110 m, what is the correct angle of banking of the road? (b) If the curve were not banked, what would be the ...

*October 7, 2014*

**religion**

who do members of the Jesuit Volunteer Corps work for?I need help,been stuck on this question for,like,15 minutes,I've been searching the internet for 20 minutes.

*September 28, 2014*

**History of Middle Ages**

The answer is C not A

*September 22, 2014*

**chemistry**

In 26. The reaction is Br- + H3O+ = HBr + H2O. Not Br- + H3O+ = HBr = H2O! Im sorry!

*September 16, 2014*

**chemistry**

25. Which of the two reactions, A or B is a neutralization reaction? Explain why. A. HBr + H2O = Br- = H3O+ B. HClO + NaOH = NaClO + H2O 26. A. Look at the reaction again. when this reaction is reversed. Br- + H3O+ = HBr = H2O what substance is the acid, what is the base. B. ...

*September 16, 2014*

**chemistry**

Please identify the acid and the base in this equation. HClO + NaOH = NaClO + H2O Thank you!

*September 15, 2014*

**History**

The third one would be Serbia.

*September 15, 2014*

**Chem**

41. How much heat energy must you use to raise the temperature of 100 grams of water from 60C to 70C. Show your calculations. 42. You have a pot of 100C liquid water. If you add heat to the water, will the temperature start to raise at once? why or why not. Thank you for your ...

*September 15, 2014*

**Social Studies**

The answer is B because, she is creating and selling something herself.

*September 15, 2014*

**Chemistry: Please Help!!**

39. Explain why sweating cools you down in terms of molecular kinetic energy. 40. You take a pizza out of the oven and let it cool briefly. When you bite into it, the crust is not too hot but the cheese burns your mouth. Explain why this happens in terms of specific heat ...

*September 15, 2014*

**Chemistry: Please Help!!**

37. Lake Michigan is a very large, very deep body of water, located in a region of the United States that gets quite cold in winter. On the coldest day of last year, what was the temperature at the bottom of the lake. Explain your answer in terms of density of water. 38. ...

*September 15, 2014*

**Chemistry**

B. Could non-polar nitrogen molecules and polar water molecules form bonds with one another? if so, what kind? C. Given your answer to B above, do you think that there is a great deal of N2 dissolved in the oceans, a small amount, or none at all?

*September 15, 2014*

**Earth Science**

D. Epicenter.

*September 15, 2014*

**math**

3/4 of a gallon is 6/7 of the amount originally in the container. how much was in container originally

*April 20, 2014*

**social studies**

where did major general William Rufus Shafter stay while he controlled the war? PLEASE HELP!!!!!!

*April 7, 2014*

**Math**

In triangle ABC, m<A=71, m<C=41, and BC=96. To the nearest tenth, what is AB?

*March 27, 2014*

**Math**

Write a rule in function notation to describe transformation that is a reflection across the x-axis. A. Ry-x(X,Y) B. Rx-0(X,Y) C. Rx-y(X,Y) D. Ry-0(X,Y)

*March 27, 2014*