Monday
December 5, 2016

Posts by Kelly

Total # Posts: 1,710

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

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)
???
October 26, 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

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

Statistics
A
November 9, 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

Math
The answer is B. This is because when u subtract 4y to get it on the other side it cancels with the other 4y giving u 0=-11 which is an incorrect statement. for C) u get 14z= -11 and z is =/-11/14
October 12, 2015

Math
subtract 2 from the right side to get 5x=6x+9 then subtract 6x to get -1x=9. divide by 1 to get x=-9. this make the equation true. Therefore it is open.
October 12, 2015

Science Urgent😖😖😖
I would say it is C
October 12, 2015

business econ
What is the break even in units? Bottle, Label and Production (direct material and labor) = $9.12 per 12 oz. can Advertising & promotion (fixed) = $218,000 Company Overhead (fixed) = $354,000 Formula I'm using: Breakeven in units (BEU)= total fixed cost / (unit price –...
October 12, 2015

Mathmatics
A sc tourists bureau survey showed that 75 % of those who seek information about the state actually come to visit . The office received 8 requests for information. What is the probability that probability that 4 to 6 inclusive of the people will visit sc?
October 11, 2015

Calculus
I've done everything I can think of to solve this, but I have no idea. Find the derivative: y = sq rt{11x + sqrt[11x + sqrt(11x)]}
October 7, 2015

Calculus
A mass on a spring vibrates horizontally on a smooth level surface (see the figure). Its equation of motion is x(t) = 8 sin t, where t is in seconds and x is in centimeters. The first part of the question is to find the velocity and acceleration equations, which I got to be: v...
October 6, 2015

Intro to Undergraduate Studies
Does the sentences below need to be cited? Why or why not? Bill Gates is the founder of Microsoft. Students who studied two hours a day did 25% better in the final exam.
October 6, 2015

Calculus
The equation of motion of a particle is s = t3 − 12t, where s is in meters and t is in seconds. For the velocity function, I got v(t)=3t^2-12 and for acceleration, a(t)=6t. The final question is: Find the acceleration when the velocity is 0. How do I do that?
September 29, 2015

Calculus
Find the limit as x approaches infinity. sqrt(81x^2 + x)− 9x. I've worked this two different ways and have gotten 0 and 1/9, neither of which is the right answer according to the homework system??
September 14, 2015

Calculus
I misread the question!! I was thinking that setting it equal to 0 would be something completely different. Thank you so much!
September 14, 2015

Calculus
If a rock is thrown upward on the planet Mars with a velocity of 19 m/s, its height (in meters) after t seconds is given by H = 19t − 1.86t^2. When will the rock hit the surface?
September 14, 2015

Algebra
Find the domain of the function. (Write your answer using interval notation.) sqrt(x)/ (4x^2 + 3x − 1) If you set the bottom equal to zero, I got that x can't be -1 or 1/4. But I'm not sure if that's right, or how to write the answer in interval notation.
September 12, 2015

Algebra
Find the domain of the function. Write in interval notation. sqrt(x^2 − 64). For the answer, I got (-infinity, -8)u(8, infinity), but that's wrong, and I'm not sure what else to try?
September 12, 2015

Calculus
If a ball is thrown into the air with a velocity of 34 ft/s, its height (in feet) after t seconds is given by y = 34t − 16t^2. Find the velocity when t = 1.
September 10, 2015

Calculus
If a ball is thrown into the air with a velocity of 40 ft/s, its height in feet t seconds later is given by y = 40t − 16t^2. Find the average velocity for the time period beginning when t = 2 and lasting for each of the following. 1) 0.5 seconds.
September 9, 2015

Calculus (limits)
The question is to "state the value of each quantity, if it exists." We are given a piecewise function that is graphed, and no equation. What does it mean when we're asked to find f(2)?
September 3, 2015

Math
A rock is thrown upward with a velocity of 12 meters per sec from the top of a 25 meter high cliff and it misses on it's way back down. When will the rock be 3 meters from water
September 1, 2015

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