Tuesday

October 25, 2016
Total # Posts: 1,426

**Chemistry**

Are these reactions Exothermic or Endothermic? How do I know? 1.) Mg(OH)2(s)<==>Mg+2(aq) + 2OH-(aq) Saw solution lighten from medium pink to very light when heated in hot water bath. (It had phenolphthalein drop for indicator.) 2.) HSO4-(aq)+ H2O(l)<==>H3O+(aq)+SO4...

*July 11, 2013*

**Aftercare school curriculum**

Most common early childhood program in the united states

*July 2, 2013*

**Chemistry **

Do I solve this by multiplying 1.8645 by 1.14??The equation of your calibration curve from a spectrophotometry experiment was y = 1.8645x. Assuming your calibration curve is set up exactly like it was in lab (concentration in mM on the x axis and absorbance on the y axis), ...

*June 25, 2013*

**Physics**

A seesaw is 4 meters long and is pivoted in the middle. There is a 350 N child on the left end. Where will a 540 N person have to sit to balance the seesaw?

*June 22, 2013*

**Spanish**

La palabra escondida es unscramble these letters sneauodsyma

*May 28, 2013*

**math**

7/4 as f/15 therefore 4 times 3.75 = 15 then 7 times 3.75 = 26.25 Answer: 26.25 is the force needed to stretch 15 inches which is m.

*May 27, 2013*

**math**

3/5

*May 27, 2013*

**statistics**

My mean is 175.5 My standard deviation is=90.57 Sample=25 Formula to be used: P(X>190)=P((X-mean)/s sqrt of my sample is = 5 (Which is the square root of 25.)(190-175.5) / 90.57/5) 14.5/18.114 calculator says 0....

*May 27, 2013*

**statistics**

Facebook reports that the average number of Facebook friends worldwide is 175.5 with a standard deviation of 90.57. If you were to take a sample of 25 students, what is the probability that the mean number Facebook friends in the sample will be 190 friends or more?

*May 27, 2013*

**health care**

How does the system of health care provision in the U.S. support goals of public health? Provide an example.

*May 25, 2013*

**MATH - PLEASE HELP**

A biased coin is tossed 5 times where p(t) = .6. determine the probability that if you have 2 tails, you have 3 tails.

*May 25, 2013*

**Math**

thanks so much!

*May 25, 2013*

**Math**

A biased coin is tossed 5 times where p(t) = .6. determine the probability that if you have 2 tails, you have 3 tails.

*May 25, 2013*

**Math**

Edna has scored in 80% of the games she's played.What is the probability she woulds score a goal in at least 7 out of her 8 games. P (if she scored in 3 or 4 games, what is the probability that she scores in exactly 4).?

*May 24, 2013*

**Microeconomy**

uppose the demand for these jets is given by the equation: P = 3000 - Q, where Q denotes the quantity of jets, and P denotes its price. So that the marginal revenue facing the firm is: MR = 3000 - 2Q. The marginal cost of Lockheed Martin is given by the equation: MC(Q) = 2Q ...

*May 24, 2013*

**Math**

Fantasia Florist Shop purchases an order of imported roses with a list price of $2,375 less trade discounts of 15/20/20. What is the dollar amount of the trade discount? Answer: 1306.25 4. Using your answer to the question above, what is the net dollar amount of that rose ...

*May 20, 2013*

**Math**

What is the net price factor for trade discounts of 25/15/10? Answer: .57375 Just checking my homework answers

*May 20, 2013*

**Math**

Natureland Garden Center buys lawn mowers that list for $679.95 less a 30% trade discount. What is the dollar amount of the trade discount? Answer: 203.99 What is the net price of each Natureland Garden Center lawn mower? Answer: 475.96 Just want to make sure my answer is ...

*May 20, 2013*

**Math**

By what percent is a 100-watt light bulb brighter than a 60-watt light bulb? Round to the nearest tenth. 40/60 = 2/3 = 2 ÷ 3 = 0.666667 0.666667 x 100 = 66.6667% Answer: 66.7% Is this correct?

*May 13, 2013*

**Math**

What is the portion if the base is 900 and the rate is 12¾ %? P=RxB P=12.75x900 P=11,475 Is this correct?

*May 13, 2013*

**Math**

Sunshine Honda sold 112 cars this month. If that is 40% greater than last month, how many cars were sold last month? x=112*100/140 x= 80 Answer: 80 Is this correct?

*May 13, 2013*

**Math**

Michael Reeves, an ice cream vendor, pays $17.50 for a five-gallon container of premium ice cream. From this quantity he sells 80 scoops at $0.90 per scoop. If he sold smaller scoops, he could sell 98 scoops from the same container; however, he could charge only $0.80 per ...

*May 13, 2013*

**Math**

By what percent is a 100-watt light bulb brighter than a 60-watt light bulb? I'm not sure the equation to use to solve this one.

*May 13, 2013*

**Math**

Sorry Ms. Sue. I put your name in by mistake.

*May 13, 2013*

**Math**

After a 15% pay raise, Scott Walker now earns $27,600. What was his salary before the raise? Answer: 27600=.15x*27600 x=4140 27600-4140=23,460 Is my answer correct?

*May 13, 2013*

**Math**

A letter carrier can deliver mail to 112 homes per hour by walking and 168 homes per hour by driving. By what percent is productivity increased by driving? Answer: 56% Is my answer correct?

*May 13, 2013*

**Math**

If 453 runners out of 620 completed a marathon, what percent of the runners finished the race? (Round percent to the nearest tenth.) Answer: 453/620= .731 Changing to percent 73.1% Is this correct?

*May 13, 2013*

**Math**

Thanks!

*May 10, 2013*

**Math**

What is the exact answer to cos^2x - sin^2x = 0 for between 0 and 2pi? I got x = pi/4 and x = 5pi/4. But the answer key says there are two additional answers which are 3pi/4 and 7pi/4. I don't know how to get these. Any help is much appreciated!

*May 10, 2013*

**Math**

Problem Solving Work Backward The test that Keyshawn's class took finished at 10:30 a.m. The first part of the test took 30 minutes. There was a 15 minute break. The second part of the test also took 30 minutes. At what time did the test start?

*May 2, 2013*

**Math**

Problem Solving: Work Backward At 12 noon, Leslie recorded the temperature as 56 degree Fahrenheit. The temperature had increased by 8 degree Fahrenheit from 10 a.m. The temperature at 8 a.m. was 2 degree Fahrenheit warmer than it was at 10 a.m. What was the temperature at 8 a.m.

*May 2, 2013*

**Math**

I'm having a hard time coming up with the right equation to solve this one. E-Z Stop Fast Gas sold $10,957 worth of gasoline yesterday. Regular grade sold for $2.30 a gallon and premium grade sold for $2.55 a gallon. If the station sold 420 more gallons of regular than of ...

*May 1, 2013*

**Math**

Is this the correct numerical expression for 15 less than one-ninth of P? 15-1/9 P

*May 1, 2013*

**Math**

A machine produces a voltage in the following formula V(t) = 300cos(10(pi)x). X is the time in seconds. Graph the function with the restriction 0 < X < 1

*April 28, 2013*

**accounting**

Phil Phoenix is paid monthly. For the month of January of the current year, he earned a total of $8,288. The FICA tax rate for social security is 6.2% and the FICA tax rate for Medicare is 1.45%. The FUTA tax rate is 0.8%, and the SUTA tax rate is 5.4%. Both unemployment taxes...

*April 28, 2013*

**AP tatistics**

A horticulturist wishes to estimate the mean growth of seedlings in a large timber plot last year. A random sample of n = 100 seedlings is selected and the one-year growth for each is measured. The sample yields = 5.62 cm. The known standard deviation for this popualtiopn is ...

*April 21, 2013*

**Programming in c++**

c++

*April 15, 2013*

**Science**

Make a solutions by dissolving 4 lbs of sulfur dioxide in 100 lbs of water then heat to 30 degress C. what is the partial pressure of the sulfur dioxide over the solution specified?

*April 13, 2013*

**Math**

A scientist is mixing a chemical solution for an experiment. The solution contains 3/8 ounce of a chemical and 1/6 ounce saline solution. What is the unit rate of chemical to saline solution?

*April 5, 2013*

**Math Statistics**

The annual per capita consumption of fresh apples (in pounds) in a nearby state can be approximated by a normal distribution, with a mean of 15.9 pounds and a standard deviation of 4.2 pounds. (a) What is the smallest annual per capita consumption of apples that can be in the ...

*April 1, 2013*

**math**

10%

*March 31, 2013*

**statistics**

I need a estimate within $25, the true average of amount of postage a company spends each year. If I want to be 98% confident, how large a sample is necessary? The standard deviation is known to be $80

*March 29, 2013*

**statistics**

The standard deviation of the diameter of 18 baseballs was 0.29cm. Find the 95% confidence interval of the true standard deviation of the diameters of the baseballs. Do you think the manufacturing process should be checked for inconsistency?

*March 28, 2013*

**statistics**

confidence intervals: A researcher is interested in estimating the average salary of teachers in a large school district. She wants to be 95% confident that her estimate is correct. If the standard deviation is $1050, how large a sample is needed to be accurate within $200.

*March 28, 2013*

**Chemistry**

Enough of a monoprotic acid is dissolved in water to produce a 0.0190 M solution. The pH of the resulting solution is 2.33. Calculate the Ka for the acid.

*March 26, 2013*

**statistics**

Us travel data center survey of 1500 adults found that 42% of respondents stated that they favor historical sites. Find the 95% confidence interval of the true proportion of all adults who favor visiting historical sites.

*March 25, 2013*

**statistics**

Confidence Intervals; In a survey of 1004 individuals, 442 felt that Randolph spent too much time away. Find a 95% confidence interval for the true population proportion

*March 25, 2013*

**macroenomics**

Suppose the minimum wage is above the equilibrium wage in the market for unskilled labour. Using a demand and supply diagram of the market for unskilled labour, show the market wage, the number of workers who are employed, and the number of workers who are unemployed. Also ...

*March 13, 2013*

**Math**

Can you show 1 3/5, 1.3, and 1 1/10 on a number line?

*March 11, 2013*

**statistics**

If the average number of textbooks is 16, the standard deviation is 5, and the average age of a professors is 43, with a standard deviation of 8, which data set is more variable?

*March 10, 2013*

**Physics**

A 79.4-Ω and a 47.7-Ω resistor are connected in parallel. When this combination is connected across a battery, the current delivered by the battery is 0.296 A. When the 47.7-Ω resistor is disconnected, the current from the battery drops to 0.126 A. (a) Determine...

*March 6, 2013*

**Chem**

The National Institute of Science and Technology (NIST) kinetics database lists the rate constant, k, of a particular gaseous reaction as 5.78× 10–10 cm3·molecule^–1·s^–1 at 298 K. Convert this constant, k, to torr^-1 X S^-1.

*February 27, 2013*

**chem**

2.26

*February 23, 2013*

**math**

round up 114.29 to nearest cent

*February 22, 2013*

**english**

Identify the correct sentence. a) Georgia wanted only to be loved, Dante wanted only to love her. b) Georgia wanted only to be loved and Dante wanted only to love her. c) Georgia wanted only to be loved Dante wanted only to love her. d) Georgia wanted only to be loved; Dante ...

*February 21, 2013*

**help please english**

what word that is in the ip family and means a baby bird

*February 21, 2013*

**chemistry**

A solution contains 2 mEq/ml of KCL (Molecular weight 74.5). If a 20 ml ampule of this solution is diluted to 1 liter what is the percent strength of the resulting solution?

*February 21, 2013*

**business**

1 for a large company stock/mutual fund would you expect the betas to be positive or negative for each of he factores in a fama french multifactor model? 2 What do you observe abouth the bata coefficients for the different mutual funds? comment on any similarities or ...

*February 17, 2013*

**Physics**

You testify as an "expert witness" in a case involving an accident in which car A slid into the rear of car B, which was stopped at a red light along a road headed down a hill. You find that the slope of the hill is theta= 12.0°, that the cars were separated by ...

*February 15, 2013*

**Algebra**

How do I solve this equation? Please explain and do step by step. 6m squared -5m-14=0

*February 13, 2013*

**Math**

Number Sense Fabio said that there are 3 times as many people on a basketball team as on a tennis team. Is he correct? Explain why or why not. Tennis--2 players Basketball--5 players Softball--10 players

*February 11, 2013*

**math**

6/7 * 35/1 = 210/7=30 right handed students 4/5 * 30/1 = 120/5 = 24 right-handed brown -eyed students

*February 11, 2013*

**Corporate Finance**

You are given the following for Cardinal & Cardinal, Inc. Their tax rate is 34%. The firm is in need of $5 million dollars in external funds. Your bond advisor suggests that new bond issues can be lower than the current yield to maturity by 1.5% . Existing capital structure...

*February 4, 2013*

**Physics**

In the figure below, an electron is moving rightward between two parallel charged plates separated by distance d = 2.40 mm. The particle is speeding up from an initial speed of 3620 km/s at the left plate. ｜ ｜ &#...

*January 31, 2013*

**social studies**

what are the legislative district numbers for zip code 29621-3504

*January 29, 2013*

**cultral diversity**

Help! check my answer Emergent literacy skills are significantly enhanced by a. the educational or professional level of one or both parents b. engaging in literacy events with other persons,especially adults. c.the family's socio-economic ststus and aspirations. d....

*January 24, 2013*

**Earlychilodhood education**

say that again slowly

*January 20, 2013*

**English**

1. George Bernard Shaw criticized The Importance of Being Earnest for (1 point) (0 pts) being too long. (0 pts) not being funny. (1 pt) not having real substance. 2. Choose the word below that best completes the sentence: He’s incredibly ___________; he just can’t ...

*January 14, 2013*

**Physics**

A rubber ball is attached to a paddle by a rubber band. The ball is initially moving away from the paddle with a speed of 4.0 m/s. After 0.25 s, the ball is moving toward the paddle with a speed of 3.0 m/s. What is the average acceleration of the ball during that 0.25 s? Give ...

*December 16, 2012*

**PHYSICS**

What force must be exerted on the master cylinder of a hydraulic lift to support wt of a 2000 kg car resting on the slave cylinder? master : 2cm diameter,slave: 24cm diameter

*December 11, 2012*

**physics**

what depth of mercury creates a pressure of 1 atm?

*December 11, 2012*

**calculus**

How many gallons of gas is in a cylindrical tank (that is laying on it’s side, the circular bases are vertical, the diameter of the bases are 5 feet, the length of the tank is 8 feet, the gas is at a 2 ft level)?

*December 9, 2012*

**physics**

a person is standing at the top of a 58 m tall hill. He stumbles and falls. As he rolls down the hill, magically friction has no effect on him! when he is still 25.0 m above the base of the hill determine how fast he is moving.

*December 7, 2012*

**Financial **

Jenny has a part time job and her net take-home income is $2000 per month. She needs to allocate her funds to reflect a balanced monthly budget. Jenny's main categories of expenses include rent, utilities, and groceries.

*December 7, 2012*

**Algebra**

Joe can drive from his house to his office in 40 minutes at an average speed of 40 miles per hour. What average is needed to drive the same distance in half an hour? If necessary, round your answer to the nearest tenth.

*December 5, 2012*

**Algebra URGENT**

Write an equation of a line perpendicular to y=2x+3 and passes through (3,4).

*December 4, 2012*

**Algebra URGENT**

Write an equation that is in slop-intercept form of the line that passes through the points: (-1/2, -1) and (3, 5/2).

*December 4, 2012*

**Algebra**

Write a linear equation to model the situation. You borrow $70 from your brother. To repay the loan, you pay $7 per week.

*December 4, 2012*

**Algebra**

16/1

*December 4, 2012*

**Physics**

When a metal pipe is cut into two pieces, the lowest resonance frequency in one piece is 244Hz and that for the other is 454Hz. What resonant frequency would have been produced by the original length of pipe? (Assume the speed of sound in air is 345 m/s) b). How long was the ...

*November 30, 2012*

**Physics**

A source of sound (1140Hz) emits uniformly in all directions. An observer 3.09m from the source measures a sound level of 38.2dB. Calculate the average power output of the source.

*November 30, 2012*

**Physical science**

Physical science a 2.0g metal ball that carries a charge of 10 uC is placed into an electric field. the ball at rest at point A is accelerated to point B with a speed of 1.0 m/s. what is the electric potential difference between point A and point B?

*November 25, 2012*

**^th grade math,**

using mental math and distributive property solve: 25(12)

*November 15, 2012*

**Physics HELP!!**

A square, 0.74m on a side, is mounted so that it can rotate about an axis that passes through the center of the square. This axis is perpendicular to the plane of the square. A force of 26.8N lies in this plane and is applied to the square. What is the magnitude of the maximum...

*November 12, 2012*

**Physics HELP!!**

A lower 0.56m long leg is being exercised. It has a 48.0N weight attached to the foot and is extended at an angle θ with respect to the vertical. Consider a rotation axis at the knee. At what angle θ does the magnitude of the torque equal 14.2 N-m?

*November 12, 2012*

**chemistry**

what elements follow the octet rule?

*November 9, 2012*

**chemistry... HELP !!!!!!!**

For the reaction 2Co^3+ (aq) + 2Cl^- (aq) ----> 2Co^2+ + Cl2 (g) E^o = 0.46 V (STANDARD cell potential) what is the cell potential at (25 deg C) if the concentrations are [Co^3+] = 0.651M , [Co^2+]= 0.846 M, and [Cl^-] = 0.636 M and the pressure of Cl2 is PCl2= 9.30 atm ?

*November 5, 2012*

**chemistry... HELPP**

A gaseous reaction occurs at a constant pressure of 45.0 atm and releases 62.5 Kj of heat. Before the reaction, the volume of the system was 8.60 L . After the reaction, the volume of the system was 3.00 L. Calculate the total internal energy change in kilojoules.

*November 5, 2012*

**chemistry... HELP**

Equilibrium constant question!!!? Standard reduction potentials Reduction half-reaction E(V) Ag+(aq) + e- ---> Ag (s) 0.80 Cu ^2+ (aq) + 2e- ---> Cu (s) 0.34 Sn^4+(aq) + 4e- ---> Sn (s) 0.15 2 H+(aq) + 2e- ---> H2 (g) 0 Ni^2+(aq) + 2e- ---> Ni (s) -0.26 Fe^2+ (...

*November 3, 2012*

**chemistry**

The standard reduction potentials of lithium metal and chlorine gas are as follows: (for Li, reduction potential is -3.04, for Cl it is 1.36) In a galvanic cell, the two half-reactions combine to 2Li{+](s) + Cl{-}2(g) --> 2Li{+}Cl{-}(aq) cell potential=4.4 V Calculate the ...

*November 3, 2012*

** working with children from culturally diverse **

which cultures are most closely aligned in valuing dependence over autonomy? American mainstream and Native American or Mexican American and Native American

*November 1, 2012*

**science**

If Wire A has a poterntial difference of 50V across it and carries a current of 2A. Wire B has a potential difference of 100V across it and also carries a current of 2A. Compare the resistances, rate of flow of charge, and rate of flow of energy in the two wires?

*October 30, 2012*

**Internet Server Environments**

What is Cold FusionMX and how would you accommodate on a Windows 2000 server?

*October 28, 2012*

**writing**

Could you please proofread this along with punctuation. It's an essay and it will be doubled spaced when I submit it. Thank you In approximately 200–350 words, using compare/contrast strategies, discuss the benefits and/or advantages of shopping online, rather than ...

*October 25, 2012*

**English Language**

Yes,she is my cousin.- Is the comma identify as an introductory phrase?

*October 25, 2012*

**Physics HELP!!**

Forces of 11.1N north, 19.9N east, and 14.0N south are simultaneously applied to a 3.62kg mass as it rests on an air table. What is the magnitude of its acceleration? b) What is the direction of the acceleration in degrees? (Take east to be 0 degrees and counterclockwise to be...

*October 24, 2012*

**Physics HELP!!**

Two horizontal forces F1 and F2, are pulling an object of mass 3.05kg from two opposite sides. F1 pulls to the right and F2 pulls to the left. The magnitude of F1 is 99.2N. The object moves strictly along the horizontal x-axis, which we chose as positive to the right. Find the...

*October 24, 2012*

**MEC**

two charges repel each other with a force of 0.1N when they are 5cm apart. Find the forces between the same charges when they are 2cm and 8cm apart.

*October 24, 2012*

**math**

72-25

*October 23, 2012*

**Physics**

The forace exerted by the air The problem does not state units, this assuming the weight is Kg and acceration is m/s2 g = 9.8 a = .9 from Netwon law sum of force= ma helicopter weight + frame weight X g + frame weight X a= force exerted by air Force =(7900+1100) x 9.8 + (1100 ...

*October 23, 2012*