# Posts by Ethan

Total # Posts: 263

**Calculus II**

Find the centroid (x¯,y¯)(x¯,y¯) of the region bounded by: y=5x^2+6x y=0 x=0 x=6 I know the integral (think, at least) is from 0 to 6 and between the first and second equation given, but I missed this lecture and have no idea how to find the center of mass

*February 19, 2017*

**calculus**

Find the volume of a solid whose base is bounded by the parabola x=y^2 and the line x=9, having square cross-sections when sliced perpendicular to the x-axis.

*February 3, 2017*

**Geography**

I really appreciate you helping everybody Ms.Sue . THANK YOU!!!

*February 1, 2017*

**Geography**

Than South Africa

*February 1, 2017*

**Geography**

why do you think the ratio of people with HIV/AIDS is lower in Northern Africa?

*February 1, 2017*

**Scholarships**

Oh. Okay

*December 22, 2016*

**Scholarships**

I am a middle-schooler that is going to skip a year to go straight to high school. I have been looking for scholarships I can apply to now. Do you guys know any good sites?

*December 22, 2016*

**Math | Algebra**

aww MAN!!!! No one responding!

*December 14, 2016*

**Math | Algebra**

Brand A granola is 25?% nuts and dried fruit and brand B granola is 20?% nuts and dried fruit. How much of sweet item A and sweet item B should be mixed to form a 20-lb batch of sweets that is 23?% nuts and dried? fruit?

*December 14, 2016*

**English**

2 & 3 is not use in generic use because it is referring to a certain flower.

*December 13, 2016*

**Math | Algebra**

Thank You Ms.Sue

*December 13, 2016*

**Math | Algebra**

Is the answer around 18?

*December 13, 2016*

**Math | Algebra**

Thank you so much!!

*December 13, 2016*

**Math | Algebra**

A Caterer has 8 cups of red candies. How many cups of white candies must she add to the red candies to create a candy mix that is 30% red candies.

*December 13, 2016*

**History**

The so-called Equal Rights Amendment has never been ratified. In 1848, a group of abolitionist activists–mostly women, but some men–gathered in Seneca Falls, New York to discuss the problem of women's rights. (They were invited there by the reformers Elizabeth ...

*December 13, 2016*

**statistics**

What's the question?

*December 13, 2016*

**Chemistry**

4Fe + 3O2 = 2Fe2O3 158g of Fe will react with how many litres of O2 to produce the maximum amount of Fe2O3

*December 11, 2016*

**English**

The fifth grade class was 3/5 boys. Of those boys, 4/6 had brown hair. What fraction were boys and had brown hair?

*May 25, 2016*

**Algebra**

the length of a rectangle is 4 less than 3 times the width if the perimeter is 48 inches find the length and the width

*May 22, 2016*

**Meteorology**

Warmer temperatures increases the kinetic energy of water molecules which enables them to escape the water surface faster

*April 19, 2016*

**social studies { somebody please help me please**

C B D D

*April 12, 2016*

**Calculus**

An architect wants to design a window in the shape of a rectangle capped by a semicircle. If the perimeter of the window is constrained to be 24 feet, what dimensions should the architect choose for the window in order to admit the greatest amount of light?

*February 6, 2016*

**Algebra**

How do you write the expression that represents the total length of each segment

*January 20, 2016*

**Equations and Inequalities Unit Test**

I am going to do the same test right now - I NEED HELP PLEASE!!!

*January 20, 2016*

**math**

rewrite each pair of unlike fractions as like fractions

*January 6, 2016*

**PreCalculus - Need help, due tonight**

1. Rewrite the expression 1/2ln(x – 6) + 3ln(x +1) as a single logarithm. 2. Rewrite the expression 1/3[ln x – 2ln(1 – x)] as a single logarithm.

*December 7, 2015*

**Physics**

A certain diving bell for use in the ocean has a square window measuring 0.250 m on each side. The inside of the bell is pressurized and maintained at a pressure of 2.00 atm. The mass density of seawater is 1025 kg/m3. How deep can this bell be lowered before the vector sum of...

*December 6, 2015*

**Algebra**

A company charges $6 to make an pattern for an order of T-shirts and $11 for each T-shirt it produces from the pattern. The expression $11n+$6 represents the cost of n T-shirts with the same pattern.Find the total cost for 5 T-shirts with the same pattern.

*November 30, 2015*

**Chemistry**

4.80 L of N2, at 25 ∘C and 1.22 atm , is mixed with 1.80 L of O2, at 25 ∘C and 0.122 atm , and the mixture allowed to react. N2(g)+O2(g)→2NO(g) How much NO, in grams, is produced?

*November 6, 2015*

**Geometry**

prove that if the lengths of two sides of a and b, triangle are a and b respectively, then the lengths of the corresponding altitudes to those sides are in the ratio b/a.

*November 4, 2015*

**Science**

What type of water evaporates quicker:well water or salt river water?

*November 1, 2015*

**physics**

A 2.6 kg toy locomotive is pulling a 1.7 kg caboose. The frictional force of the track on the caboose is 0.52 N backward along the track. If the train is accelerating forward is 3.1 m/s2, what is the magnitude of the force exerted by the locomotive on the caboose? How would I ...

*October 29, 2015*

**chemistry**

2C4H10 + 13O2 ==> 8CO2 + 10H2O

*October 19, 2015*

**Physics**

A 20-kg child running at 1.4 m/s jumps onto a playground merry-go-round that has inertia 180 kg and radius 1.6 m. She is moving tangent to the platform when she jumps, and she lands right on the edge. Ignore any friction in the axle about which the platform rotates.

*October 19, 2015*

**Math**

back

*October 7, 2015*

**Physics**

So, vf = final velocity = 5.01m/s vi = initial velocity = 23.5m/s a = acceleration = -2.12m/s^2 d = distance I plugged everything in and got 0.045. Is this the correct way to solve? 5.01^2 = 23.5^2 + 2(-2.12)d 25.1001 = 548.01d d = 25.1001/548.01 Thanks!

*September 16, 2015*

**Physics**

Thank you! I was stuck on this problem

*September 16, 2015*

**Physics**

A train is traveling south at 23.5 m/s when the brakes are applied. It slows down with a constant rate to a speed of 5.01 m/s in a time of 8.73 s. How far does the train travel during the 8.73 s? I have already found -Acceleration during braking: -2.12m/s

*September 16, 2015*

**math**

Find the smallest positive integer n for which 126n cube root is a whole number

*September 10, 2015*

**math**

(18.6)-y

*August 30, 2015*

**math**

translation for y less than 18 times 6

*August 30, 2015*

**math**

15x-12

*August 30, 2015*

**math**

yes. thanks

*August 30, 2015*

**math**

translation of 12 less than 15 time x

*August 30, 2015*

**math**

I got the same answer 100/w

*August 30, 2015*

**math**

translation of the quotient of 100 and w

*August 30, 2015*

**math**

the product of a number and 35

*August 30, 2015*

**Chemistry**

I believe that the answer to 1 is C because, according to the first law of thermodynamics, energy can be converted from one form to another but is neither created nor destroyed. So, the total energy of the universe would remain the same even if the system's energy ...

*August 3, 2015*

**Physics**

If it was to be built in real life the difference in height will increase potential energy, the mass will increase, and therefore because it was increased uniformly F=MA acceleration will be constant. so yes.

*June 20, 2015*

**math**

So if by LCD you mean Least Common Denominator, I would start off with finding values of 7 8 12 that are the same, so by multiplying 7 and 8 you get 56 which is not a multiple of 12. so we must now find the LCM of 56 and 12 which is 168 found by looking at the progression of ...

*June 20, 2015*

**English**

Word Bank: deliberately, derision, despair, diligent, fatigue, felicitous, fervent, impudent, insolence, keen, lingered, meagerness, merit, mock, obliged, resentful, tedious, terse, treacherous, vast. 1. When it looked like all hope was lost for winning the war, the commander ...

*June 18, 2015*

**English**

Word Bank: deliberately, derision, despair, diligent, fatigue, felicitous, fervent, impudent, insolence, keen, lingered, meagerness, merit, mock, obliged, resentful, tedious, terse, treacherous, vast. While most museum visitors displayed respect for the artiste's work, ...

*June 18, 2015*

**Language Arts**

Word Bank: deliberately, derision, despair, diligent, fatigue, felicitous, fervent, impudent, insolence, keen, lingered, meagerness, merit, mock, obliged, resentful, tedious, terse, treacherous, vast. While being an extra on a movie set may seem fun and exciting, it is ...

*June 18, 2015*

**LA**

then what is 1? thanks though

*June 18, 2015*

**LA**

Word Bank: deliberately, derision, despair, diligent, fatigue, felicitous, fervent, impudent, insolence, keen, lingered, meagerness, merit, mock, obliged, resentful, tedious, terse, treacherous, vast. While most people in Los Angeles will go to a Dodger's game every now ...

*June 18, 2015*

**Language Arts**

Word Bank: deliberately, derision, despair, diligent, fatigue, felicitous, fervent, impudent, insolence, keen, lingered, meagerness, merit, mock, obliged, resentful, tedious, terse, treacherous, vast. The fact that the lottery winner flaunted his newly acquired wealth made all...

*June 18, 2015*

**English**

Word Bank: deliberately, derision, despair, diligent, fatigue, felicitous, fervent, impudent, insolence, keen, lingered, meagerness, merit, mock, obliged, resentful, tedious, terse, treacherous, vast. The group of friends _________ around the coffee shop long after it was ...

*June 18, 2015*

**Languarge Arts**

Word Bank: deliberately, derision, despair, diligent, fatigue, felicitous, fervent, impudent, insolence, keen, lingered, meagerness, merit, mock, obliged, resentful, tedious, terse, treacherous, vast. When it looked like all hope was lost for winning the war, the commander ...

*June 18, 2015*

**Science**

If the volume of a balloon is 5.0 L at 22 degrees Celsius, what will be the new volume if the balloon is heated to 75 degrees Celsius? Should the volume increase or decrease? 5/22=x/75 x=17.045

*May 27, 2015*

**math**

A video rental company offers a plan that includes a membership fee of $8 and charges $2 for every DVD borrowed. They also offer a second plan, that costs $14 per month for unlimited DVD rentals. If a customer borrows enough DVDs in a month, the two plans cost the same amount...

*April 23, 2015*

**Chemistry AP**

This isn't quite an HW question, I'm needing any site that gives practice Free Response problems for equilibrium for AP Chemistry if there are any for study and practice.

*April 21, 2015*

**Algebra 2**

Karl says that you can take the square root of each side of an equation. Therefore, he says that (x + 5)2 + ( y – 7)2 = 36 and ( x + 5) + ( y – 7) = 6 are equivalent equations. Emily says the equations are not equivalent. Who is right? Explain your answer. I know ...

*March 27, 2015*

**o level mathematics**

in a class of 35, all the pupils play at least 1 game, volleyball, netball and hockey. volleyball only 10, those who play netball only 5, those who play hockey only 3, if 2 play all 3 games how many altogether play volleyball

*March 6, 2015*

**Chemistry Ap**

At 20◦C the vapor pressure of pure methanol (CH3OH) is 89.0 torr and of pure water (H2O) is 17.5 torr. A solution of methanol and water has a total vapor pressure of 35.5 torr at 20◦C. Calculate the mole fraction of methanol in this solution. Assume the solution ...

*March 3, 2015*

**Chemistry AP**

At 20◦C the vapor pressure of pure methanol (CH3OH) is 89.0 torr and of pure water (H2O) is 17.5 torr. A solution of methanol and water has a total vapor pressure of 35.5 torr at 20◦C. Calculate the mole fraction of methanol in this solution. Assume the solution ...

*March 3, 2015*

**Chemistry, HELP!**

Mole fractions

*February 26, 2015*

**Chemistry, HELP!**

Molybdenum (Mo) is a heavy metal that can have severe health effects on humans and animals. Tailings from a mining operation in Colorado have polluted surface waters used by grazing animals with Mo. Based on the following information determine the concentration of the three Mo...

*February 26, 2015*

**Math**

What is the unit rate of ounces. A hint is 48 ounces cost costs 3.00 dollars. I divided 48 by three but and got 16 cents but when I multiply by 48 it doesn't equal 3 dollars

*February 25, 2015*

**Math**

1. Daniel wants to save at least 20 dollars by putting pennies in a jar daily. On first day, he puts one penny into the jar. The second day he puts 2 pennies into the same jar. On the nth day he pus n pennies into the same jar. Which day is the first day on which he has at ...

*February 22, 2015*

**Chemistry AP**

1.301029996, thanks Bob

*February 20, 2015*

**Chemistry AP**

Hey Bob, What is the pH at the point during a titration when 20 mL of 0.200 M HCl has been added to 30 mL of 0.0500 M NH3 solution? HCl is strong acid, Kb = 1.8 × 10−5 for NH3. Answer in units of pH. I've gone about getting the mmol of HCl and NH3, getting ...

*February 20, 2015*

**Chemistry AP**

Remember the system I use for online homework does not care about significant digits, it goes out to /at least/ 6 decimal places. And I butchered spelling rearranging.

*February 9, 2015*

**Chemistry AP**

Alright, this time, I know I have not mistyped my answer. Find the initial concentration of the weak acid or base in an aqueous solution of hydrazine (NH2NH2) with a pH of 10.16. Kb = 1.70 ×10−6 Answer in M I've tried going from 10^-pH then using that (as my x...

*February 9, 2015*

**Chemistry AP**

Once again I was foolish and mistyped an earlier answer, getting 4.02e-4 for my answer. I had not put in the 0 between the 4 and the 2 when submitting.

*February 9, 2015*

**Chemistry AP**

Well, I've tried going using 4.3e-7=x^2/0.377 to get to what x equals, I've been getting 0.0069, but it's incorrect.

*February 9, 2015*

**Chemistry AP**

Calculate the concentration of H3O + present in 0.377 M H2CO3. Answer in units of mol/L I know the Ka of H2CO3 is 4.3E-7. But I don't know what to do from there. (Or, I'm not getting the correct answer at least)

*February 9, 2015*

**SS**

What was the purpose of the Adams-Onis Treaty? Can some help me answer this question?? Ms. Sue??

*February 6, 2015*

**Chemistry AP**

The UT (University of Texas) Quest system, Online quizzes, takes it out further for it to count as correct, when I am taking in class tests on paper, yes, it's cut down using significant digits.

*February 5, 2015*

**Chemistry AP**

I've figured out my mistake, mentioned above your post, mistypes when inputting answers are a terrible thing :p

*February 5, 2015*

**Chemistry AP**

I made a silly mistake and inputted the correct answer of 4.805909915 as 4,805909915, I noticed as I looked at my previous answers, sorry for all of this.

*February 5, 2015*

**Chemistry AP**

Calculate the pH of a 0.44 M aqueous solution of NH4Cl. Kb = 1.8 × 10−5 . I've tried used the Ka=Kw/Kb equation then used the resulting 5.5e-10 in Kw=([H+][Cl-])/[NH4Cl] , using that to get the [H+], but it isn't correct and I don't know what else to do...

*February 5, 2015*

**Chemistry AP**

Correction. I meant Ka=([H+][Cl-])/[NH4Cl] not Kw

*February 5, 2015*

**Chemistry AP**

Calculate the pH of a 0.44 M aqueous solution of NH4Cl. Kb = 1.8 × 10−5 . I've tried used the Ka=Kw/Kb equation then used the resulting 5.5e-10 in Kw=([H+][Cl-])/[NH4Cl] , using that to get the [H+], but it isn't correct and I don't know what else to do.

*February 5, 2015*

**Physics**

3.4N

*February 2, 2015*

**AP Chemistry**

Calculate the entropy change when 4.88 g of H2 reacts with O2 according to the reaction 2H2(g) + O2(g)→2H2O(ℓ)at 298 K and 1 atm pressure. The standard molar enthalpy of formation of H2O(ℓ)at 298 K is −285.8 kJ/mol. The corresponding free energy of ...

*January 20, 2015*

**AP Chemistry**

What is the value of w (work) when 1.3 moles of H2 expands from 25 liters to 50 liters against a constant external pressure of 1 atm, then expands further from 50 to 100 liters against a constant external pressure of 0.1 atm? Answer in calories. Answer in units of cal I know ...

*January 6, 2015*

**physics**

Calculate the momentum of a 0.1 kg rifle bullet traveling 500 m/s. Answer in units of kg•m/s

*November 13, 2014*

**History**

It was all correct

*November 5, 2014*

**Math**

Write a subtraction equation with a difference of 54.57. Then draw a number line to show between which two whole numbers the difference lies

*October 21, 2014*

**English Check**

The dude who talked about Marilyn is right

*September 8, 2014*

**PHYSICS**

25.65 m

*July 28, 2014*

**trigonometry**

A tent pole is 85 feet high. A cable is attached to the ground 200 feet from the tower base. How long is the cable? What is the measure of the angle the cable makes to the ground?

*May 26, 2014*

**math graphs**

Thank you so much mili

*May 5, 2014*

**social studies**

thanks @slimshady

*April 23, 2014*

**physics**

Two stars are 4.40 1011 m apart and are equally distant from the earth. A telescope has an objective lens with a diameter of 1.03 m and just detects these stars as separate objects. Assume that light of wavelength 550 nm is being observed. Also assume that diffraction effects...

*April 18, 2014*

**math**

I will guess the length of the lace shall be larger than 51. It shall be larger than twice of the circumference. So I would say (3) 101.

*February 9, 2014*

**Biology: Genetics**

In guinea pig, short hair (L) is dominant to long hair (l) and the heterozygous condition for yellow coat (Y) and white coat (y) gives cream coat. A short haired guinea pig is bred to long haired white guinea pig and one of the offspring is a long haired baby guinea pig. a. ...

*February 4, 2014*

**Calculus**

A spherical oil tank with a radius of 10 feet is half full of oil that weighs 60 pounds per cubic foot. Its top is 6 feet underground. How much work is needed to pump the oil out of the tank through a hole in its top? How do I solve this? Does the fact that it its top is 6 ...

*December 14, 2013*

**Calc**

I did the problem. I found the fluid force to be 54 times the integral from -3 to 0 of (-y)(2)(root(9-y^2)dy my final answer was 972 pounds. Is that correct? note from my work: h(y)=-y L(y)=2x=2root(9-y^2)

*December 14, 2013*