Wednesday

August 20, 2014

August 20, 2014

Total # Posts: 1,666

**chemistry**

1- A compound is 87.5% nitrogen and 12.5% hydrogen. The molecular weight of the compound is 32 g/mol. Describe the molecule referencing shape, and inter-molecular forces. 2- Gaseous butadiene, C4H6 , reacts with hydrogen gas in the presence of a platinum catalyst to form ...
*January 6, 2014*

**chemistry**

Consider the following reaction: CH3X + Y CH3Y + X At 25oC, the following two experiments were run, yielding the following data: Experiment 1 : [Y]0 = 3.0 M [CH3X] Time(hr) 7.08 x 10-3M 1.0 4.52 x 10-3M 1.5 2.23 x 10-3M 2.3 4.76 x 10-4M 4.0 8.44 x 10-5M 5.7 2.75 x 10-...
*January 6, 2014*

**Physics**

Mutiple choice: A car travelling at 10 m/s accelerates at 3 m/s^2. Its new velocity is A.) 12 m/s B.) 22m/s C.) 17 m/s D.) Can not be determined. Which of the following is not acceleration? A.) rate of change of speed in a particular direction B.) rate of change of motion in a...
*December 17, 2013*

**Physics**

The innerspring mattress on your grand- mother’s bed is held up by 23 vertical springs, each having a spring constant of 6000 N/m. A 43 kg person jumps from a 1.93 m platform onto the innersprings. The acceleration of gravity is 9.8 m/s2 . Assume: The springs were ...
*December 16, 2013*

**physics**

A child and sled with a combined mass of 47.4 kg slide down a frictionless hill that is 8.61 m high. If the sled starts from rest, what is its speed at the bottom of the hill?
*December 5, 2013*

**math**

Angela scored in the 90th percentile of her class math test. If 27 students scored the same as or lower than she did, how many students are in the class?
*December 5, 2013*

**math**

In a game played with 50 letter tiles, 21 of the tiles are vowels. If a tile is drawn at random, what is the probability that it is a consonant.
*December 5, 2013*

**math**

A recipe for a fruit shake calls for 5 parts milk, 3 parts banana puree, and 2 parts strawberry juice. Find the quantity of each ingredient necessary to make an 8 ounce shake.
*December 5, 2013*

**math**

A laptop that originally cost $1,200 is on sale for $950. Find the discount rate.
*December 5, 2013*

**Algebra 1 **

Name the property that is demonstrated by the example. 1. (2x)^3=2^3*x^3=8x^3 I am not sure what to put
*December 2, 2013*

**MATH :)**

For each of the following measurements state the number of significant digits: A length of 2.3 meters A volume of 0.65 liters A time of 0.0004 secs A population of 65,000,000 A distance of 1.30 x 104 I got: 1. 2 2. 2 3. 1 4. 2 5. 2 Just need someone to check my answers please ...
*November 30, 2013*

**Algebra 1**

oh thanks
*November 25, 2013*

**Algebra 1**

Sorry problem on left answer on right
*November 25, 2013*

**Algebra 1**

The problem is on the right and the answer is on the left
*November 25, 2013*

**Algebra 1**

square root to nearset integer 125 11 200 14 -47 -6
*November 25, 2013*

**Statistics**

Many dairy cows now receive injections of BST, a hormone intended to spur greater milk production. A group of 53 Jersey cows increased average milk production from 43 to 52 pounds per day, with a standard deviation of 4.8 lbs. Is this evidence that the hormone maybe effective ...
*November 24, 2013*

**painting**

how can you paint
*November 22, 2013*

**Decision Sciences**

Use graphical sensitivity analysis to determine the range of demand probabilities for which each of the decision alternatives has the largest expected value. I have two possible decisions, each with a favorable and unfavorable outcome. How do I do this?
*November 18, 2013*

**Statistics**

A survey was conducted to determine if there is a difference in gasoline mileage for two types of trucks, truck A and truck B. A random sample was taken for each model of truck, and the mean gasoline mileage, in miles per gallon, was calculated. Identify the appropriate ...
*November 15, 2013*

**Statistics**

To do inferential procedures comparing two proportions, we need another variance formula (our ruler). This formula is based on what principle? A) The variance of the difference of two statistics is the difference of the variances of each statistic. B) The variance of the ...
*November 15, 2013*

**math**

Do I use the Foil method to find the product of (9-3i)(9+4i)?
*November 15, 2013*

**Statistics**

You are given the following information obtained from a random sample of 6 observations. Assume the population has a normal distribution. 13 14 17 14 17 15 a. What is the point estimate of µ? b. Construct an 80% confidence interval for µ. c. Construct a 98% ...
*November 12, 2013*

**Statistics**

The monthly incomes from a random sample of workers in a factory are shown below. Monthly Income (In $1,000) 4.0 5.0 7.0 4.0 6.0 6.0 7.0 9.0 a. Compute the standard error of the mean (in dollars). b. Compute the margin of error (in dollars) at 95% confidence. c. Compute a 95% ...
*November 12, 2013*

**Math**

jim claims that the ratio of males to females in his class of 26 students is 3:2. Could jim be correct?
*November 11, 2013*

**Math**

Thank you so much Ms. Sue! You have been so much help :)
*November 11, 2013*

**Statistics**

The U.S. Department of Labor and Statistics released the current unemployment rate of 5.3% for the month in the U.S. and claims the unemployment has not changed in the last two months. However, the states statistics reveal that there is a decrease in the U.S. unemployment rate...
*November 11, 2013*

**Statistics**

To plan the budget for next year a college needs to estimate what impact current economic downturn might have on student requests for financial aid. Historically, this college has provided aid to 35% of its students. Officials look at a random sample of this year’s ...
*November 11, 2013*

**Chemistry **

A sample of unknown metal has a mass of 36.7 g. This metal was placed in boiling water at 96.0oC until the metal had reached the temperature of the water. The metal was then placed in a foam cup with 50.0 g of water in it at 20.0oC. The cup absorbs 42.0 J/oC, and the ...
*November 10, 2013*

**Statistics**

Hoping to lure more shoppers downtown, a city builds a new parking garage in the central business district. The city hopes that the parking revenues will pay for the garage. During a recent two month period (44 days), the city statistician calculated the 95% confidence ...
*November 10, 2013*

**Statistics**

Hoping to lure more shoppers downtown, a city builds a new parking garage in the central business district. The city hopes that the parking revenues will pay for the garage. During a recent two month period (44 days), the city statistician calculated the 95% confidence ...
*November 10, 2013*

**Statistics**

According to a study by the Centers for Disease Control, the national mean hospital stay after childbirth is 2.1 days. Reviewing records at her own hospital, a hospital administrator calculates that the mean hospital stay for a random sample of 81 women after childbirth is 2.3...
*November 10, 2013*

**Statistics**

According to a study by the Centers for Disease Control, the national mean hospital stay after childbirth is 2.1 days. Reviewing records at her own hospital, a hospital administrator calculates that the mean hospital stay for a random sample of 81 women after childbirth is 2.3...
*November 10, 2013*

**Statistics**

According to a study by the Centers for Disease Control, the national mean hospital stay after childbirth is 2.1 days. Reviewing records at her own hospital, a hospital administrator calculates that the mean hospital stay for a random sample of 81 women after childbirth is 2.3...
*November 10, 2013*

**Algebra 1 HELP**

Thank You
*November 9, 2013*

**Algebra 1 HELP**

The number of gallons needed of paint needed to cover a wall varies directly with the area of the wall. The Robertsons find that they have used 1/2 gallon of pain to cover 540 square feet of wall. Which of the follow equations shows the number of gallons of paint they will ...
*November 9, 2013*

**Statistics**

30 randomly selected cans of Coke are measured for the amount of cola in ounces. The sample values have a mean of 12.18 ounces and a standard deviation of 0.118 ounces. The 99% confidence interval is ( ounces, ounces). Round each result to two decimal places.
*November 9, 2013*

**Statistics**

30 randomly selected cans of Coke are measured for the amount of cola in ounces. The sample values have a mean of 12.18 ounces and a standard deviation of 0.118 ounces. Test the claim that cans of coke have a mean amount of cola greater than 12 ounces. What is the p-value? A) ...
*November 9, 2013*

**Statistics**

A researcher performs a hypothesis test to test the claim that among girls aged 9-10, the mean score on a particular aptitude test differs from 72, which is the mean score for boys of the same age. Data were collected from a random sample of 43 girls aged 9-10 years and the 95...
*November 8, 2013*

**Statistics**

A local eat-in pizza restaurant wants to investigate the possibility of starting to deliver pizzas. The owner of the store has determined that home delivery will be successful if the average time spent on the deliveries does not exceed 30 minutes. The owner has randomly ...
*November 8, 2013*

**physics**

A 66.5 kg ice skater moving to the right with a velocity of 2.09 m/s throws a 0.14 kg snowball to the right with a velocity of 22.5 m/s relative to the ground. (a) What is the velocity of the ice skater after throwing the snowball? Disregard the friction between the skates and...
*November 3, 2013*

**Algebra 1**

Can someone help me I really don't get this one The table shows the number of trolley buses in operation in the United States during certain years. Describe the rates of change in the number of buses during the time period. (Table) Year 1980 1985 1990 1995 2000 Number 823 ...
*October 31, 2013*

**chemistry **

A microwave oven heats by radiating food with microwave radiation, which is absorbed by the food and converted to heat. Suppose an oven's radiation wavelength is 12.5 cm. A container with 200 mL of water was placed in the oven and heated. How many photons are required to ...
*October 23, 2013*

**Algebra 1**

y=x+1 Domain: -2,-1,0,1,2 what is the range? Is it -1,0,1,2,3
*October 23, 2013*

**chemistry**

if 5.2 grams of bismuth react under certain conditions with 10.0 g of oxygen what is the empirical formula of the bismuth formed
*October 22, 2013*

**Geography**

I have to write a three paragraph essay on the causes of terrorism. One paragraph for each cause. All I am helping is finding 3 good causes and a little information about how they cause terrorism.
*October 20, 2013*

**chemistry**

why is the copper/sulfur mass ratio different from the mole ratio?
*October 19, 2013*

**Physics**

How do you find total displacement to and from a place?
*October 17, 2013*

**Newtons Second Law Physics**

If a cart and a string are attached and there is a weight on the end of the string to pull the cart, and both the cart and the weight on the string were the same.. what would I expect acceleration to be using Newton's second law?
*October 16, 2013*

**Physics Newtons Law**

If a cart and a string are attached and there is a weight on the end of the string to pull the cart, and both the cart and the weight on the string were the same.. what would I expect acceleration to be using Newton's second law?
*October 15, 2013*

**MATH**

Which of the following is an irrational number? a. negative square root of 5 B. 1/8 c. 0.3858585... d. negative square root of 64
*October 15, 2013*

**Chemistry**

Assuming the gas is ideal, we use the formula ρ = P*MM / RT where ρ = density (g/L) P = pressure (atm) MM = molar mass (g/mol) R = gas constant = 0.0821 L-atm/mol-K T = temperature (K) Note that this formula is just derived from the ideal gas law (PV = nRT). Convert ...
*October 15, 2013*

**vocab**

I need help on rootwords im stuck on sepect meaning look I have to find 3 words with sepect in it then put the meaning
*October 14, 2013*

**chem**

The reaction is Br2 (g) <---> 2Br (g). It occurs at T = 1600 C. When 1.05 mol Br2 are placed in a 2 Liter flask, 2.50% of Br2 undergoes dissociation. Calculate the Kp for the reaction. Okay so i did the ICE table for this, Br2 (g) <---> 2Br (g) I : 1.05/2 ..... 0 C...
*October 14, 2013*

**Algebra 1**

A cyclist can travel 29.6 miles in 2 hours. At this rate, how far can the same cyclist travel in 45 minutes? A: 14.8 B: 22.2 C: 11.1 D: 16.2
*October 10, 2013*

**Algebra 1**

A cyclist can travel 29.6 miles in 2 hours. At this rate how many gallons will it need to travel 650 miles. A: 14.8 B: 22.2 C: 11.1 D: 16.2
*October 10, 2013*

**algebra 1**

4-10y=22-6x Solve the Equation for y
*October 7, 2013*

**Algebra 1**

An architectural firm makes a model of a science center they are building. The ratio of the model to the actual size is 1 in.:85 ft. Estimate the height of the building if the model is 1.5 inches tall.
*October 5, 2013*

** Algebra 1**

You are making up your own mix of concrete to patch a set of stairs. In order to have the proper mix, you need to mix 1 part of Portland cement with 2 parts of sand and 3 parts of gravel. A. How many total parts are in one batch of concrete? B. You make a mix with 4 parts of ...
*October 5, 2013*

**Algebra 1**

23=2x+(x+3)+x I know the answer is 5 but I don't know how to show the work.
*October 1, 2013*

**Algebra 1**

what is the value of x in the rectangle Perimeter=24 meters the side is (x+3) The bottom is 2x
*October 1, 2013*

**Math**

ben deposits $320 in an account that earns 3.5% simple interest per year. what is the balance in the account year?
*September 19, 2013*

**Math- Help Please**

Find a polynominal of degree 4 that has integer coefficients and zeros 4,-4,5 and 1/2.
*September 16, 2013*

**Math**

V(t)=175(1-(t/45))^2 Find the inverse V^-1=?
*September 12, 2013*

**language arts**

why is rikki tikki tavi not afraid to fight a cobra snake
*September 11, 2013*

**physics**

You are arguing over a cell phone while trailing an unmarked police car by 25.0 m; both your car and the police car are traveling at 120 km/h. Your argument diverts your attention from the police car for 2.0 s (long enough for you to look at the phone and yell,“I won'...
*September 5, 2013*

**physics**

if a ball is tossed from ground level upward at a speed of 44 m/s how long will it take to reach its maximum height
*September 4, 2013*

**physics**

An automobile tire has a radius of 0.335 m, and its center moves forward with a linear speed of v = 24.1 m/s. (a) Determine the angular speed of the wheel. (b) Relative to the axle, what is the tangential speed of a point located 0.243 m from the axle?
*July 16, 2013*

**Physics**

An electrostatic paint sprayer has a 0.200-m-diameter metal sphere at a potential of 25.0 kV that repels paint droplets onto a grounded object. What charge must a 0.100-mg drop of paint have to arrive at the object with a speed of 10.0 m/s?
*July 14, 2013*

**statistics **

A new medication has been created to treat osteo-arthritis inflammation and pain. Doctors prescribing the drug claim that the drug is not as effective for women as men since women taking the medication have higher pain levels than men. The pharmaceutical company conducts a ...
*July 8, 2013*

**statistics **

A new medication has been created to treat osteo-arthritis inflammation and pain. Doctors prescribing the drug claim that the drug is not as effective for women as men since women taking the medication have higher pain levels than men. The pharmaceutical company conducts a ...
*July 8, 2013*

**statistics **

1. Are there more broken bones in summer or winter? We get records about the number of fractures treated in January and July at a random sample of 25 emergency rooms. The 95% confidence interval for the mean change ( μd = μJan - μJuly )in the numbers of ...
*July 4, 2013*

**statistics **

The makers of the MAGNETIZER Engine Energizer System (EES) claim that it improves gas mileage and reduces emissions in automobiles by using magnetic free energy to increase the amount of oxygen in the fuel for greater combustion efficiency. Following are test results, ...
*July 4, 2013*

**statistics **

Which of the following criteria must be met to do a one-sample test for a proportion? A. The data values in the sample must be independent. B. The parent population must be normally distributed. C. The data must come from a random sample. D. The sample size must be more than ...
*June 27, 2013*

**Statistics **

Politicians are interested in knowing the opinions of their constituents on important issues. One administrative assistant to a senator claims that more than 63% of adult women favor stricter gun laws. A recent telephone survey of 1026 adult women by IBR Polls found that 65.9...
*June 27, 2013*

**Statistics **

Politicians are interested in knowing the opinions of their constituents on important issues. One administrative assistant to a senator claims that more than 63% of adult women favor stricter gun laws. A recent telephone survey of 1026 adults by IBR Polls found that 65.9% of ...
*June 27, 2013*

**Chemistry**

Can someone please explain this to me?! Please! Thank you! How much (in kilograms) ethylene glycol antifreeze (C2H6O2)(molar mass 62.02 g/mol) has to be added to 14.4 kg of water to get a mixture that freezes at -15.5 degrees C. For water Kf = 1.86 degrees C kg/mol
*June 21, 2013*

**Statistics**

There is a random selection of 150 students. What is the probablity that the sample percentage of correct identification is greater than 75%?
*June 18, 2013*

**English **

what does it mean to follow in someones footsteps exceedingly?
*May 31, 2013*

**Math**

Gerald can complete a math assignment in 2 hours and a physics assignment in 1 hour. If he has 8 hours to complete a set of assignments, how many math assignments can he complete if he decides to leave the science assignments for the next day? This situation is given by 2x + y...
*May 27, 2013*

**Statistics **

Using advertised prices for used Ford Escorts a linear model for the relationship between a car's age and its price is found. The correlation coefficient is - 0.933 Determine R2 and interpret this statistic. A) R2 = 93.3% which means that 93.3% of the variation in car ...
*May 26, 2013*

**Statistics **

Using advertised prices for used Ford Escorts a linear model for the relationship between a car's age and its price is found. The correlation coefficient is - 0.933 Determine R2 and interpret this statistic. A) R2 = 93.3% which means that 93.3% of the variation in car ...
*May 25, 2013*

**Statistics **

The relationship between the number of games won during one season by a minor league baseball team and the average attendance at their home games is analyzed. A regression analysis to predict the average attendance from the number of games won gives the model y-hat = -2600 + ...
*May 25, 2013*

**Chemistry**

What is the intermolecular force for BaCO3?
*May 22, 2013*

**social studies**

I don't know the answer, I'm asking for help.
*May 15, 2013*

**social studies**

which of the following contributed to Britain's industrial revolution? A. large labor force C. powerful monarchy B. decreasing food D. decreasing money
*May 15, 2013*

**Math **

I am having trouble on this question. a cable TV company charges $24.95 per month for basic service and $6.95 per month for each premium channel. a customer's bill for one month is $45.80. write and solve an equation to find the number of premium chnnels the customer ...
*May 9, 2013*

**MATH**

If your starting salary increases 5% per year for 10 years, how does your salary at the end of the 10 years compare with your starting salary? It is nearly 63% higher It is 150% higher It is 50% lower It is 50% higher
*May 9, 2013*

**history**

write a brief description of the civil war activities in southern california from 1861-1865.
*May 6, 2013*

**Chemistry**

Why is this reaction considered exothermic? "Concentrated sulfuric acid dissolves in water and the solution becomes warmer." This is a homework question and when I answered the problem, I thought it was endothermic because the solution is gaining heat, but when my ...
*May 5, 2013*

**Math**

How long would it take to double your money at 15.86 percent with interest compounded annually?
*May 5, 2013*

**Chemistry **

cr(s)--->Cr^3(aq)+3e- and Pb2+(aq)+2e---->Pb(s) write a balanced equation Please help thanks
*May 5, 2013*

**Chemistry**

How do you find the equilibrium constant? ..steps?
*May 5, 2013*

**Chemistry II**

Calculate the pH at the equivalence point in the titration of 50ml of 0.20 M methylamine (Kb=4.3*10^-4) with a 0.40 M HCL solution.
*May 3, 2013*

**Calculus**

function f(x)=x3x2−1 defined on the interval [−16,16] A. Find the vertical asymptotes of function f(x) B. Find where it is concave up C. Find the inflection points
*May 2, 2013*

**Calculus**

function f(x)=x3x2−1 defined on the interval [−16,16] A. Find the vertical asymptotes of function f(x) B. Find where it is concave up C. Find the inflection points
*May 2, 2013*

**math**

if a woman has a 50 ft. piece of wire & cuts it into strips 1 2/3 feet long, how many pieces will she have
*May 1, 2013*

**chemistry, stoichiometry**

Consider the Balanced Chemical Equation 2N2+6H20-->4NH3+3O2 How many moles would be needed to react fully with 0.225 moles of N2?
*April 30, 2013*

**calculus**

Using 4x^2 - 9y^2 = 36 Find y by implicit differentiation and then solve the equation explicitly for y and differentiate to get y' in terms of x.
*April 29, 2013*

**Calculus**

Using 4x^2 - 9y^2 = 36 Find y by implicit differentiation and then solve the equation explicitly for y and differentiate to get y' in terms of x.
*April 29, 2013*

**chemistry**

a 2.3% (m/v) LiCI solution p;repared from 53.0 ml of a 10.0%(m/v)LiCI solution. what is volume in milliliters
*April 27, 2013*

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