# Posts by Kelly

Total # Posts: 1,750

**Chemisty**

Pouring liquid nitrogen onto a balloon decreases the volume of the balloon dramatically. Afterward, the balloon re-inflates. Use kinetic theory to explain this sequence of events. The temperature of liquid nitrogen is -196 degrees Celsius

**Math**

Explain how you would factor x^2-5x-24 You must explain EACH step and process t get to your factored solution The work I have done - (x-8)(x+3) I just don't understand how to explain.

**Math **

James has set up an ordinary annuity to save for his retirement in 19 years. If his monthly payments are $250 and the annuity has an annual interest rate of 7.5%, what will be the value of the annuity when he retires? I am studying for my math final and I do not remember how ...

**Statistics **

Suppose that 4 cards are drawn from a well-shuffled deck of 52 cards. What is the probability that all 4 are hearts? Would the answer be 1/4, if I reduce it? Thanks

**Math**

Terrell drove at a speed of 48 1/2 miles per hour for 2 14 hours. How far did he travel?

**Math**

The city council gave a questionnaire to its citizens, asking them to rank their priorities for next year's budget. People were asked to rank the following four choices: (P)olice, (R)oads, (S)chools, and (T)rash removal. The results are summarized in the table below. ...

**Math**

Four candidates running for mayor receive votes as follows: Ito: 16,032; Johnson: 36,072; Kennedy: 8,016; Lieberman: 12,024 How do I find the majority, if there is one? Thanks?

**Chemistry**

After the initial 1 mL of 0.2 M FeCl3 (aq) and 1 mL of 0.2 M KSCN (aq) were combined it was then diluted with an additional 130 mL of deionized water. Which way would this dilution cause the equilibrium to shift? Is a dilution going to be a stress in all situations?

**Politics **

what is it that makes a state a capitalist state? Could be the way it influences the world in economic ways? If so, what else would cause a state to become capitalist? Thanks!

**Social Studies**

I got a 0/3 from MMMMMMM answers don't listen to them

**Chemistry**

I know that the moles of each compound is the coefficient.

**Chemistry **

A 0.75 g sample of X2CO3 is dissolved in water and 80 mL of 0.20 M CaCl2 solution is added. This is the balanced equation I have created. X2CO3(aq) + CaCl2(aq) ? CaCO3(s) + 2 XCl(aq) Based on the ratio in your balanced equation, how many moles of X2CO3 must have reacted? How ...

**English**

The crowd encouraged the team. The team scored 10 points. a-the crowd encouraged the team to score 10 points. b-When the crowd encouraged the team, the team scored 10 points. c-The crowd encouraged the team, the team scored 10 points. d-The team,encouraged the crowd, scored 10...

**Algebra **

An ant is roughly 10^(-3) meters in length and the average human roughly one meter. How many times longer is a human than an ant? The human is ____ times longer than an ant.

**Math**

Ryan needs 8 5/16 feet of molding to finish a closet. He has 6 feet of molding. How many more feet of molding does he need?

**Math**

Which is a reasonable estimate? 2/3 + 4/5 a. <1 b. About 1 c. About 1 1/2 d. Between 2 and 3

**Math**

In a book closet, mathematics books are kept in stacks of 4. If each student carries no more than one stack, what is the least number of students needed to carry books for a class of 23? Your multiple choices are a. 5 students b. 6 students c. 27 students d. 19 students

**Math**

In a book closet, mathematics books are kept in stacks of 4. If each student carries no more than one stack, what is the least number of students needed to carry books for a class of 23?

**Chemistry**

Thank you for the help

**Chemistry **

You are supposed to mix 250 mL of a 0.1 M solution of Pb(NO3)2 solution. You would need to mix ______ g of Pb(NO3)2 with enough water to make 250 mL of solution.

**Algebra**

If Adam is 30 years older than Alyssa and the sum of their ages is 36. How old are they?

**Algebra**

A load of 12 kg stretches 15 cm and a load of 30 kg stretches 18 cm. Find the natural (unstretched) length of the spring.

**math**

kelly spend 2/3 of her money on books and from the remaining money, kelly spent 1/4 on food how much money did kelly spend on food from here total amount of money?

**Social Studies**

"Enjoy My Answers" is correct! 4/4 <3

**Math**

Hi can someone please help me? A recent study gave the information shown in the table about ages of children receiving toys. The percentages represent all toys sold. Age (years) Percentage of Toys 2 and under 3-5 6-9 10-12 13 and over 17% 19% 24% 13% 27% What is the ...

**Algebra**

x^2/25+y^2/100=1

**math**

24 equal squares. what is side length of one square.

**Are All Right? Math**

Oh, thank you to anyone who responds!

**Are All Right? Math**

Use cross products to see if each pair of ratios forms a proportion. Replace each box with = or ?. 1. 7/5 ? 15/10 = ? <--- 2. 6/8 ? 15/20 = <--- ? Solve each problem. 3. 2/3 = 12/x x = 18 <--- x = 12 x = 36 x = 8 4. 6/11 = 84/x x = 40 x = 120 x = 254 x = 154 <--- 5...

**Math**

Find the unit rate. Round to the nearest tenth, if necessary. 344 miles in 11 hours 344 3,784 0.03 31.27 ** Find the unit rate. In 10 months, 62.6 gallons were used. 0.16 10 6.26 ** 626

**Math**

An angle ? satisfies the relation csc ? cos ? = -1. A) Use the definition of the reciprocal trigonometric ratios to express the left side in terms of sin ? and cos ?. B) What is the relation between sin ? and cos ? for this angle? C) Determine two possible values for ?.

**Chemistry**

If you used 50 grams of copper (II) oxide, how much copper would be produced. (Use the ratio)

**Math**

a+b=36 a=b+30 b+30+b=36 2b+30=36 2b=6 b=3 a=3+30 a=33 Adam is 33, Alyssa is 3

**Calculus**

Use a(t) = -32 ft/sec2 as the acceleration due to gravity. (Neglect air resistance.) A ball is thrown vertically upward from a height of 6 feet with an initial velocity of 68 feet per second. How high will the ball go?

**Calc**

The maker of an automobile advertises that it takes 13 seconds to accelerate from 25 kilometers per hour to 90 kilometers per hour. Assuming constant acceleration, compute the following. The acceleration in m/s^2 The distance the car travels during the 13 seconds

**Calc**

Use upper and lower sums to approximate the area of the region using the given number of subintervals (of equal width). (Round your answers to three decimal places.) y = 5/x

**Math (Grade 11)**

1) The measurement is 15.5, the tolerance is 5. Whats the precision, uncertainty, range, nominal value and precent error? 2) The measurement is 14.5, the tolerance is 6. Whats the precision, uncertainty, range, nominal value and percent error? 3) The uncertainty is 15, the ...

**MATH**

What is the estimated perimeter of an ellipse if the major axis has a length of 15 ft and the minor axis has a length of 7.5 ft?

**math**

For his exercise today, Josh plans to both run and swim. Let r be the number of laps he runs and let s be the number of laps he swims. Each lap he runs takes him 4 minutes, and each lap he swims takes him 3 minutes. He wants to exercise for at least 30 minutes today. Using the...

**chemestry**

the Earth has mass of approximately 5.98* 10^24kg and radius 6.38* 10^6m. what is the density of the Earth in (a)g/cm^3 and (b) kg/m^3 ?

**Chemistry**

Write chemical formulas for the compounds formed by the following positive and negative ions: Ba2+ and NO3-, Al3+ and Co3, and K+ and PO43-

**Chemistry**

thanks dude

**Chemistry**

If you start with 4.00 moles of C3H8 (propane) and 4.00 moles of O2, how many moles of carbon dioxide can be produced?

**Chemistry**

what??

**Chemistry**

A glass of water contains 1.2 x 1024 molecules of water. An additional 4.0 moles of water are poured into the glass. How many moles of water are in the glass?

**Chemistry**

In the reaction C + O2 → CO2, 18 g of carbon react with oxygen to produce 72 g of carbon dioxide. What mass of oxygen would be needed in the reaction?

**Chemistry**

The Ka of an acid is 1.3 x 10–7. Based on the Ka and its relationship with Kw, what is the value of Kb?

**math**

How many 1oz bottles will this solution fill.

**College Algebra math**

A plane flies due east for 35 miles and then due south until it is 37 miles from its starting point. How far south did the plane fly?

**Chemistry**

Ammonia gas is passed into water, yielding a solution of density of 0.93 g/mL and containing 18.6% NH3 by weight. What is the mass of NH3 per mL of solution.

**Chemistry**

A sample of impure Limestone weighing 0.3440 g was treated with 50 mL of HCl 0.1363 mol/l. after elimination of all CO2 by boiling, excess acid was created by 4.45 mL of NaOH 0.1445 mol/L1. Calculate the% (w/w) of CaO and CaCO3 in the sample

**math**

What is the 20th term of the sequence that begins with −2, 4, -8, 16 ANSWER CHOICES: A)2,097,152 B)524,288 C)-524,288 D)1,048,576

**Geography -Yr10**

Q: List the impacts of reduced river flows that were identified within the Murray-Darling Basin in the 1980s. . Thanks

**Geography -Yr10**

Outline the reasons for competition over the Murray River's water resources in the late nineteenth century. I found nothing online for this question?

**Geography - Yr10**

In what ways is the Local Council involved in land management? What are they mainly responsible for?

**Math**

15purple marbles,3 pink marbles, and 12 gray marbles ratio of purple marbles to all marbles

**Chemistry**

Knowing that the milk of magnesia contains 8 g% of Mg (OH)2, using 1 g of milk of magnesia and added 50 mL of 0.100 M HCl, determine the required volume of a solution of 0.105 M NaOH to titrate the excess HCl 0.100 M.

**Math**

by completing the square, what value should you add to each side of the equation? x^2- 7x=5

**geometry**

46ft

**MATH**

If you roll a 6 sided dice 6 times, what is the best prediction possible for the number of times you will roll a two? A) 6 B) 1 C) 2 D) 0

**Chemistry**

Which pair of compounds will form a solution?Benzene (C6H6) and hexane (C6H14)Na2SO4 and benzene (C6H6)NaCl and hexane (C6H14)H2O and CCl4More than one of the combinations above will form solutions.

**PHYSICS**

Mars rotates slowly about its axis, the period being 687 days. The mass of mars is 6.39 x 10^23 kg. Determine the radius for a synchronous satellite in orbit around Mars. (assume circular orbit)

**Chemistry**

If it takes 45 days for 80.0 mg of a particular radioactive isotope to decay to 10.0 mg what is its half-life?

**Chemistry**

Calculate the concentrations of Cd ⁺ ², [Cd (CN)₄-²] and CN at equilibrium when they dissolve mole of 0.42 Cd (in the ₃)²⁺ 2.50 M. Given: Kf = 7, 1 x 10 ^16

**Chemistry**

What is the pH of a solution made by mixing 1.40 mL of 0.0043 molar Sr(OH)2 with 8.90 mL of 0.0029 molar Sr(OH)2 solution?

**math**

peggy was taking a timed 90 question test she was able to correct 90% of the questions how many questions did she answer correctly

**Chemistry**

Consider the chemical equation. 2H2 + O2 -> 2H2O What is the percent yield of H2O if 87.0 g of H2O is produced by combining 95.0 g of O2 and 11.0 g of H2? a 56.5% b 59.0% c 88.5% d 99.7%

**Chemistry**

thanks DrBob222 =)

**Business**

A department manager is attempting to motivate employees by moving them from one job to another. What is this strategy called? A. Job enlargement C. Job rotation B. Job enrichment D. Job justification

**Physics**

A 4kg box is attached to a 2.4m rope rotating on platform. Max tension can withstand without breaking is 140N. 1.) Find Max. speed w/ which the box can rotate if the surface of platform is frictionless. 2.) Find Max speed w/ which box can rotate if Coeff. of friction between ...

**math**

7 over x + 8 equals 6/2 x solve for x show work and how can I get some help with this question results now

**Math**

Explain how you know that 21/30 is greater than 2/3

**english**

What the does the mask in Paul Dunbar's poem "We Wear the Mask" represent? or B.

**english**

Which of the following did NOT contribute to the Harlem Renaissance? A.The Emancipation Proclamation. B. By 1930, the population of African Americans in Harlem grew to over 200,000. C.F. Scott Fitzgerald <-- All Harlem Renaissance writers wrote literature about suffering, ...

**Ms.sue plz help**

Please.

**English**

Which of the following did NOT contribute to the Harlem Renaissance? A.The Emancipation Proclamation. B. By 1930, the population of African Americans in Harlem grew to over 200,000. C .F. Scott Fitzgerald I meant A. sorry..

**English**

Which of the following did NOT contribute to the Harlem Renaissance? A.The Emancipation Proclamation. B. By 1930, the population of African Americans in Harlem grew to over 200,000. <-- C.F. Scott Fitzgerald All Harlem Renaissance writers wrote literature about suffering, ...

**Math (check plz)**

#2 ... D?

**Math (check plz)**

y = 2x + 4 2x - y = 6 Solve the system of equations using substitution. A) (2,8) B) (2,-8) C) (10,24) D) no solution <-- 4x + 3y = 6 -4x + 2y = 14 olve the system of equations. A) x = 1/2, y = 3 B) x = 3, y = 1/2 <-- or D? C) x = 4, y = -3/2 D) x = -3/2, y = 4

**Health**

I think it's A.

**Health**

What happens when anabolic steroids are used in high doses? A. Increases irritability and aggression B. Decreases irritability and aggression C. Increases feelings of complacency D. Decreases feelings of complacency

**life orientation**

By using posters

**english**

If there is practice after school on Friday, I can drop the kids off and you can pick them up.

**Calc help!**

its x/(x-3) - (x+1)/(x+3) How did you get that answer?

**Calc help!**

what would be the answer to this question? The answer i got isn't one of the choices: (x/x-3) - (x+1/x+3) I got 1/x+3

**Maths**

John had €120 he spent 3/4 of it how much did he spend

**Chemistry**

A mass of 0.100 mg TIOH is mixed with 174 ml of pure water. Calculate the pH of this aqueous solution?

**English**

THANK YOU SOOOOOOOOOOOOO MUCH!!!!!

**stats**

One company produces movie trailers with mean 150 seconds and standard deviation 40 seconds, while a second company produces movie trailers with mean 120 seconds and standard deviation 30 seconds. What is the probability that two randomly selected trailers, one produced by ...

**Chemistry**

A can of soda has the total volume of 350ml. This can is open and only contains atmospheric air, and is placed within a furnace 100 ° C. After the can achieve this reduced temperature at 25 ° C. With decreasing temperature, there is a reduction of the internal pressure...

**Chemistry**

Thank you :D

**Chemistry**

A concentration of PCL5(g),4,0 mol/L, verifies that the process PCl5(g) = PCl3(g) + Cl2(g) is achieved with a degree of balance of 20% Calculate the equilibrium of the reaction constant

**Chemistry**

When iron reacts with copper (2) chloride, one of two possible reactions take place: Fe(s) + CuCl2(aq) to FeCl2(aq)+Cu(s) OR 2Fe(s) + 3Cucl2(aq) to 2FeCl3(aq) + 3Cu(s)... What charge does the iron atom have carry in each of the two possible products FeCl2 vs. FeCl3.

**math(epidemiology)**

Thank you for your help Steve, I used that equation and got 810py but I assumed my answer was wrong because I got such a big number.

**math(epidemiology)**

A population of 100 healthy men was followed for the development of prostate cancer. After being followed for 5 years, 20 men developed prostate cancer. Ten other men were followed for 1 year and then were lost to follow-up. The remaining men who never developed the disease ...

**Math**

Is 4000 cups < 400 qt? Here is my answer 400 quarts = 1600 cups.

**college question**

It says each academic year, but I'm not sure if it means at the end of the first semester or second

**college question**

Hello, I have a question about scholarships in college. I know you need to maintain a certain gpa to keep a scholarship, but do you need to keep that gpa at the end of each semester, or at the end of each academic year?

**math**

Given that x+2y=4,determine the minimum value of x^2+xy-y^2.

**Science**

I have a picture of a boat sailing over a wave. I have arrow A at the front of the boat going down to the ocean floor and there's the boat at the bottom, which is marked B, the arrow then starts back up to the back of the boat and is labeled C. They want to know what is ...