# Posts by kelly

Total # Posts: 1,739

**Chemistry**

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

*March 20, 2017*

**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 ...

*March 20, 2017*

**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...

*March 10, 2017*

**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.

*February 27, 2017*

**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?

*February 19, 2017*

**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

*February 19, 2017*

**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

*February 19, 2017*

**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?

*February 19, 2017*

**Chemistry**

Thank you for the help

*February 12, 2017*

**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.

*February 12, 2017*

**Algebra**

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

*February 10, 2017*

**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.

*January 24, 2017*

**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?

*January 22, 2017*

**Social Studies**

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

*January 10, 2017*

**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 ...

*December 14, 2016*

**Algebra**

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

*December 13, 2016*

**math**

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

*December 7, 2016*

**Are All Right? Math**

Oh, thank you to anyone who responds!

*December 1, 2016*

**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...

*December 1, 2016*

**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

*December 1, 2016*

**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 ?.

*November 23, 2016*

**Chemistry**

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

*November 18, 2016*

**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

*November 18, 2016*

**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?

*November 18, 2016*

**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

*November 18, 2016*

**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

*October 29, 2016*

**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 ...

*October 26, 2016*

**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?

*October 7, 2016*

**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...

*September 25, 2016*

**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 ?

*August 20, 2016*

**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-

*July 30, 2016*

**Chemistry**

thanks dude

*July 29, 2016*

**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?

*July 29, 2016*

**Chemistry**

what??

*July 28, 2016*

**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?

*July 28, 2016*

**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?

*July 6, 2016*

**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?

*June 20, 2016*

**math**

How many 1oz bottles will this solution fill.

*June 15, 2016*

**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?

*May 23, 2016*

**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.

*May 22, 2016*

**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

*May 21, 2016*

**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

*May 17, 2016*

**Geography -Yr10**

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

*April 30, 2016*

**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?

*April 30, 2016*

**Geography - Yr10**

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

*April 29, 2016*

**Math**

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

*April 27, 2016*

**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.

*April 25, 2016*

**Math**

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

*April 24, 2016*

**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

*April 20, 2016*

**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.

*April 19, 2016*

**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)

*April 16, 2016*

**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?

*April 7, 2016*

**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

*April 4, 2016*

**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?

*March 31, 2016*

**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

*March 30, 2016*

**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%

*March 23, 2016*

**Chemistry**

thanks DrBob222 =)

*March 23, 2016*

**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

*March 19, 2016*

**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 ...

*March 17, 2016*

**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

*March 9, 2016*

**Math**

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

*March 8, 2016*

**english**

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

*February 26, 2016*

**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, ...

*February 26, 2016*

**Ms.sue plz help**

Please.

*February 26, 2016*

**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..

*February 26, 2016*

**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, ...

*February 26, 2016*

**Math (check plz)**

#2 ... D?

*February 25, 2016*

**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

*February 25, 2016*

**Health**

I think it's A.

*February 19, 2016*

**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

*February 19, 2016*

**life orientation**

By using posters

*February 17, 2016*

**english**

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

*January 29, 2016*

**Calc help!**

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

*January 25, 2016*

**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

*January 25, 2016*

**Maths**

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

*January 25, 2016*

**Chemistry**

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

*January 23, 2016*

**English**

THANK YOU SOOOOOOOOOOOOO MUCH!!!!!

*January 22, 2016*

**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 ...

*January 22, 2016*

**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...

*January 22, 2016*

**Chemistry**

Thank you :D

*January 20, 2016*

**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

*January 20, 2016*

**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.

*January 19, 2016*

**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.

*January 18, 2016*

**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 ...

*January 18, 2016*

**Math**

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

*January 10, 2016*

**college question**

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

*December 17, 2015*

**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?

*December 17, 2015*

**math**

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

*December 12, 2015*

**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 ...

*December 10, 2015*

**Chemistry**

150 g of water at 80 degree Celsius is cooled to 50 degree Celsius how much heat is lost bye the water

*December 6, 2015*

**Math**

Mr Lopez owns a home that sits on 7/8 of an acre. He has decided to plow up 1/4 of the property to create a garden. What fraction of an acre will he plow up?

*December 1, 2015*

**Math**

Jasmin needs 3/8 yard of fabric for each stripe of a striped quilt she is making. There are 14 stripes on the quilt. How many yards of fabric does Jasmin need?

*December 1, 2015*

**physics**

what is the acceleration of a car going 25m/s on a cloverleaf with a radius of 45 m?

*November 20, 2015*

**Physics**

A car accelerates from rest with a uniform acceleration of 1.7m/s for 10 seconds, its acceleration then reduces by 0.3m/s for 20 seconds of the motion, it then maintains the speed attained for another 20 seconds after which it decelerates to rest within 10 seconds. Draw the ...

*November 11, 2015*

**FINANCE**

WHAT IS THE VALUE OF A $100 PAR PREFERRED STOCK THAT MUST BE RETIRED AFTER 10 YEARS IF IT PAYS A DIVIDEND OF $5 ANNUALLY AND THE INVESTOR REQUIRES A 6 PERCENT RATE OF RETURN

*November 5, 2015*

**Math**

I need help please: Express in symbols:"Six decreased by the product of a number and six is twenty."

*October 24, 2015*

**math**

msrcus wants to buy 5 baseball cards. he has $35 what is the most each card will cost? write inequality to solve

*October 19, 2015*

**science**

what is the main difference between lava and magma?

*October 13, 2015*

**Physics**

Determine the stopping distances for a car with an initial speed of 93 km/h & human reaction time of 0.80 s, for an acceleration a=−4.0m/s2.?

*October 12, 2015*