Friday

July 1, 2016
Total # Posts: 795

**Science**

In order to analyze the wastewater containing cu2+ from a manufacturing process, 1.0L of water was evaporated to 10.0mL, then placed in a spectrophotometer tube. The absorbance was found to be 0.30. Using your calibration curve, calculate the number of milligram of Cu2+ in 1....
*June 7, 2016*

**Econ**

So would that still mean the economy would improve since the retirement pays can be a sort of incentive to draw in more people into that town.
*May 29, 2016*

**Econ**

Wouldn't the economy improve as well since there are more consumers and workers are able to continue working and producing products??
*May 29, 2016*

**Econ**

What will result from an increased life expectancy and improved health care?
*May 29, 2016*

**Math**

Anybody?
*May 18, 2016*

**Math**

Jacob mixes the letters J,K,L,J,K,M,N and P throughly. Without looking Terry draws one letter. Expressed as a fraction, decimal and percentage what is the probability the K will NOT be the letter terry selects A. 1/4,0.25,25% B.3/4,0.75,75% C. 4/3,1.33%, 13.3% D. 5/8,0.625,62...
*May 18, 2016*

**Physics**

An object of weight W hangs by three ropes as shown above. What is the value of the angle @ if T1 = T2 = W? ____________ \@ @/ T2\ /T1 \__/ |W| a) 15 b) 30 c) 40 d) 45 e) 60
*May 9, 2016*

**Chemisty**

V1M1=V2M2
*April 21, 2016*

**Chemistry<--------**

Sulfur dioxide in the effluent gases from coal-burning electric power plants is one of the principal causes of acid rain. One method for reducing SO2 emissions involves partial reduction ofSO2 to H2S followed by catalytic conversion of the H2S and the remaining SO2 to ...
*April 21, 2016*

**Chemistry**

Bumping this for help.
*April 12, 2016*

**Chemistry **

Calculate the pH of 0.250 L of a 0.65 M formic acid (HCO2H) - 0.10 M sodium formate (HCO2Na) buffer before (on your own) and after the addition of (a) 0.010 mol of NaOH (on your own) and (b) 0.010 mol of HCl (in the blank). Assume that the volume remains constant. I need help.
*April 12, 2016*

**Heath**

Shortly after quitting a smoker will A. Develop shortness in breath B. Regain their senses of smell and taste C. Lose circulation in their hands and feet D. Develop rapid Heart beats**
*March 14, 2016*

**Health**

Thanks!
*March 11, 2016*

**Health**

So then it is bronchitis ?
*March 11, 2016*

**Health**

A respiratory disorder in which the bronchi become inflamed and thick mucus in produced is called Asthma** Bronchitis Cancer Addiction Let me know if I'm right or wrong. Thanks
*March 11, 2016*

**Math**

A basketball team recently scored a total of 92 points on a combination of 2-point field goals, 3-point field goals, and 1-point foul shots. Altogether, the team made 51 baskets and 22 more 2-pointers than foul shots. How many shots of...
*March 9, 2016*

**Math**

Thanks!!
*March 9, 2016*

**Math **

Use the function rule to complete the table. -10x + y = 4 X -2 -1 0 1 2 Y * * * * *
*March 9, 2016*

**Math**

Find the function rule x -2 -1 0 1 2 Y 9 4 -1 -6 -11
*March 9, 2016*

**Math**

Karina has an 8 1/2inch by 11inch sheet of paper.She wants to leave a 3/4 inch margin on all 4 sides. What are the dimensions of the remaining area.
*March 7, 2016*

**Math**

Karina has an 8.5in by 11in sheet of paper.She wants to leave a 3-4ths inch margin on all 4 sides.What are the dimensions of the remaining area.
*March 7, 2016*

**Science **

A girl standing on a bridge throws a stone vertically downward with an intial velocity of 15.0 m/s into the river below. If the stone hit's the water 2.00 seconds later what is the height of the bridge above the water?
*March 3, 2016*

**Physics **

A girl standing on a bridge throws a stone vertically downward with an initial velocity of 15.0 m/s into the river below. If the stone hit's the water 2.00 seconds later what is the height of the bridge above the water?
*March 3, 2016*

**Math**

Give examples of three functions and three relations, using at least three different representations (e.g., symbolic representations, graphical representations, diagrams, tables of values, lists of ordered pairs). Use the definitions for function and relations to justify why ...
*March 3, 2016*

**Geometry**

If theta is an acute angle of a right triangle and cos theta equals 3/8, what is the value of csc theta?
*February 28, 2016*

**Algebra**

there is not graph provided
*February 24, 2016*

**Algebra**

The problem has two related parts 1) let a be an arbitrary real number. Find the distance between the point (1,2) and the point (4,a). (answer should be an algebraic expression in terms of a). 2) find the value of b for which the point (0,b) is equidistant from (4,4) and (5,-4...
*February 24, 2016*

**Algebra**

there is not graph...
*February 24, 2016*

**Physics**

Research stations in Siberia, Antarctica, and other remote locations use human power. People at the stations turn pedals, similar to bicycle pedals, that are connected to electrical generators. A researcher wants to investigate the power output of a person at a research ...
*February 15, 2016*

**Math**

32,48,72,108...Arithmetic or geometric I think it is arithmetic Then Find common difference or ratio multiple of 12? What are the next 3 terms 120,132,144 What is the "zero" term 12 not sure what this means though What is the equation? 12n * n
*February 9, 2016*

**Math**

A principal of $2000 was invested in a savings account for 4 years. If the interest earned for that period was $480 what is the interest rate? I = prt for r I did: 2000= 480(4) 2000=1920 9.6%
*February 1, 2016*

**Math**

The track team ran a mile and a quarter during its practice. How many kilometers did the team run?
*January 27, 2016*

**Physics**

570.0762 kg
*January 27, 2016*

**College algebra**

It took Eric 8 hours to drive to a job interview. On the way home, he was able to increase his average speed by 18mph and make the return drive in only 5 hours. Find his average speed on the return drive. Rate x time =distance Original drive- x. ____ _____ Return drive- ____ ...
*January 24, 2016*

**math**

Kate’s garden measures 15 yards by 12 yards. In order to make a path around it, she will need to reduce the size of her garden. The dimensions of the smaller garden will be related by a scale factor of 0.7. What is the area of the path around the garden in square yards? ...
*January 13, 2016*

**Math**

Ralph had 3/4 of a pie left. He divided this into six equal sized slices. What fraction of the original pie was eaten?
*December 14, 2015*

**College Algebra **

You have a credit card with a balance of $3000. Each month the minimum payment is 2.5% of the balance. The monthly interest rate is 1.5% of the balance. You decide you would like to pay off this card by making the minimum payment each month. You cut up the card so that you ...
*December 1, 2015*

**Physics**

1. The problem statement, all variables and given/known data A 2.0-m measuring stick of mass 0.175 kg is resting on a table. A mass of 0.500 kg is attached to the stick at a distance of 74.0 cm from the center. Both the stick and the table surface are frictionless. The stick ...
*November 30, 2015*

**Physics**

i meant t
*November 30, 2015*

**Physics**

Okay so for t = 0.850 s I would plug in 0.850 for R?
*November 30, 2015*

**Physics**

At t = 0 s,a particle of mass 7.08 kg starts from rest at the origin and moves with a velocity v = 6.00t^2i(hat) − 6.00tj(hat) + 6.00k(hat) m/s. 1. What is the angular momentum of the particle at t = 0 s I know angular is calculated from moment of inertia * angular ...
*November 30, 2015*

**Statistics**

Find the critical value za/2 that corresponds to a=0.12.
*November 20, 2015*

**Algebra 2**

A single engine aircraft can fly 120 mph in still air. If the aircraft can fly 490 miles flying with the wind in the same amount time it can fly 350 miles when flying against the wind, what is the speed of the wind? I can't figure out how to set up the equation.
*November 17, 2015*

**Chemistry**

It's 0.854 M NaOH solution react completely with 2.1 L of a 0.972 M BaCl2. It's a 2:1 but I see what I did. Late nights sometimes mess with ya. Thank you. Might need help In the future.
*October 28, 2015*

**Chemistry**

Thanks. The problem I was having, I would multiply the grams by the molar mass by everything else I done was correct to what you were saying. What I don't understand is why you divide and not multiple(I do this for when it says a volume of somthing and get the right answer)
*October 28, 2015*

**Chemistry**

Ok so you take 3.141g and divide that by 90.036?
*October 28, 2015*

**Chemistry **

2 KMnO4 + 5 H2C2O4 + 3 H2SO4 ---> 2 MnSO4 + 10 CO2 + 8 H2O + K2SO4 How many milliliters of a 0.123 M KMnO4 solution is needed to react completely with 3.141 of oxalic acid? Please help I've worked this every way I know.
*October 28, 2015*

**Physics**

The mass of a beetle is 0.000004kg. If a beetle's center of mass rises 0.75 mm while it is pushing against the floor and then continues to travel up to a height of 250 mm above the floor, what is the magnitude of the force exerted by the floor on the beetle?
*October 22, 2015*

**Science**

An object has a length of 5.2 cm a width of 3 cm and a height of 1.5 cm what's the volume
*October 11, 2015*

**Math**

A train from York to Dalton left at the same time as a train from Dalton to York. One train traveled 68 kilometers per hour, and the other traveled 62 kilometers per hour. The trains met in 5 hours. How far is it from York to Dalton?
*September 28, 2015*

**Physics**

Police find skid marks 65.0 m long on a highway showing where the car made an emergency stop. Assuming the acceleration was -10.3 m/s^ ( about the maximum for dry pavement) how fast was the car going?
*September 19, 2015*

**social studies**

Age of Enlightenment
*September 15, 2015*

**Physics**

An object is traveling at a constant speed of 12.0 m/s when it slows to a stop. If it takes 10.0 m for the object to stop, what is the magnitude of its acceleration?
*September 9, 2015*

**Equilibrium**

So the answer would be 12811.12?
*August 3, 2015*

**Equilibrium**

So basically, the temperature is there just to be there?
*August 3, 2015*

**Equilibrium**

An equilibrium mixture at 852 K is found to contain 3.61*10^-3 mol/L of SO2, 6.11*10^-4 mol/L of O2, and 1.01*10^-2 mol/L of SO3. Calculate the equilibrium constant Keq, for the reaction where SO2 and O2 are reactants and SO3 is the product. Equation would be: 2SO2 + O2 <...
*August 3, 2015*

**Equilibrium**

nevermind figured it out
*August 3, 2015*

**Equilibrium**

An aqueous solution of carbonic acid reacts to reach equilibrium as described below. H2CO3(aq) + H2O(l) <---> HCO3^-(aq) + H3O^+(aq) The solution contains the following solute concentrations: Carbonic Acid: 3.3*10^-2 mol/L HCO3^-: 1.19*10^-4 mol/L H3O^+: 1.19*10^-4 mol/L...
*August 3, 2015*

**Equilibrium**

Nevermind I figured it out
*August 3, 2015*

**Equilibrium**

The following reaction has an equilibrium constant (Keq) of 160. 2 NO2(g) <--> 2 NO(g) + O2(g) What will be the reaction quotient (Q) and in which direction will the reaction proceed if the partial pressure of NO2 is 5.0*10^-4 atm, NO is 0.080 atm, and O2 is 0.020 atm? ...
*August 3, 2015*

**MATH**

To mix a punch, Lindsay begins with 3 liters of lemon-lime soda and adds 1,893 milliliters of cranberry juice. How many 250-mL glasses of punch can be served? Note: Round to the nearest tenth
*May 16, 2015*

**math**

Homeowners in the United States use more than 15 million pounds of pesticides on their lawns every year. Convert this rate to ounces per day, rounded to the nearest whole number.
*May 16, 2015*

**math**

A cup of sugar do I divide. This or multiply
*May 12, 2015*

**math**

Used 2/12 of sugar in each cupcake if they make 9 cupcakes how much sugar get used for each one explain how I get the answer
*May 12, 2015*

**Science**

I know this is true because I just had taken this test a few weeks ago
*May 6, 2015*

**Science**

17. False 16. true 15. true and it looks like everything else is Great! Other then a few but im sure you'll work hard enough to find them out.
*May 6, 2015*

**Combinations-Math**

The number of possible delegations without considering any restriction is C(9,3) = 84. The number of possible delegations which do not include any woman is C(5,3) = 10. So the answer should be: 84-10 = 74. I don't know how you get 129, and why is the answer 112. If you ...
*April 10, 2015*

**solve math problem**

The number of possible delegations without considering any restriction is C(9,3) = 84. The number of possible delegations which do not include any woman is C(5,3) = 10. So the answer should be: 84-10 = 74. I don't know how you get 129, and why is the answer 112. If you ...
*April 10, 2015*

**Career Explorations**

I thinks it's career Explorations
*March 18, 2015*

**math**

275l=ml
*March 17, 2015*

**Chemistry**

The starting material in this synthesis experiment Fe(NH4)2(SO4)2*6H2O. What is the ionic charge of the atom? Show your calculations
*March 17, 2015*

**science**

Na2 SO4 + Ca Cl----> Ca SO4 +Na Cl
*March 1, 2015*

**Math Vectors**

that looks right....what can be said about them is that they are parallel in space
*February 27, 2015*

**Science check**

True
*February 27, 2015*

**physics**

Using a coil made of 117 turns of single-strand copper wire, you use a motor to rotate the coil at a constant angular speed of 30.0 revolutions per second at various orientations and locations throughout the room. In one particularly significant orientation, you notice a ...
*February 3, 2015*

**chm**

An aqueous solution that is 10.0 percent sulfuric acid (H2SO4) by mass has a density of 1.143 g/mL. Determine the molality of the solution. ( 3 significant figures)
*February 3, 2015*

**english check answer**

Choose the term that best describes the underlined phrase line with the " around it "This is a battle" about which little is known. A, noun clause B, adverb clause C, adjective clause D, independent clause
*January 7, 2015*

**calculous (check)**

If air resistance is neglected, a falling object travels 13 ft during the first second, 39 ft during the next, 65 ft during the next, and so on. These distances form the arithmetic sequence 13, 39, 65, ... .In this sequence, a(subscript)1 = 13 d equals 26. Find a formula for f...
*December 12, 2014*

**Math**

Write the following comparison as a ratio reduced to lowest terms. 25 nickels to 38 dimes?
*December 11, 2014*

**Calculous (Finding Zeros!)**

y = (x^2+2x-5) (x^3+3x^2-40x) Find the zeros ( 5 total zeros ) x = x = x = x = x = So would it be easier for me to distribute first then factor the whole mess out to find the x-intercepts that are the zeroes?. Or. factor (x^2+2x-5) and (x^3+3x^2-40x) and find the zeroes?
*December 5, 2014*

**Calculous**

X value to make profit would be 1/2 < x <4 Break even point x = 1/2 and x = 4 If this part of my work helps at all. Just looking at this point for the price of each unit and the check portion for when I will lose money
*December 4, 2014*

**Check Please**

Whether to calculate the price is correct and when will I be losing money
*December 4, 2014*

**Calculous**

The total cost, in millions of dollars, of producing x thousand units of an item is C(x) = 4(x − 1)^2 + 4. The revenue (in millions of dollars) from selling x thousand units of the item is R(x) = 10x. What does this tell you about the price of each unit? Give your answer...
*December 4, 2014*

**Calculous**

Describe in words the long run behavior as x approaches infinity of the function y = 6x^6 + (4x^4/x^-9) -9x^7+3 I know y goes to positive infinity as x approaches infinity The graph resembles ? (is it 4x^5) I tried simplifying 4x^4/x^-9 and got 4/x^-5 is what the graph ...
*December 4, 2014*

**physics**

A 90-kilogram physics student would weigh 2970 Newtons on the surface of planet X. What is the magnitude of the acceleration due to gravity on the surface of planet X?
*December 4, 2014*

**Chemistry**

Thank you DrBob222
*November 30, 2014*

**Chemistry**

I need chemistry help. I think 1. c, 2.b, & 3.a (please tell me why or why not and help me set up the problems if possible) 1.) The following half reaction has been balanced except for the electrons. How many and where should the electrons be included? 14 H+(aq) + Cr2O72-(aq...
*November 30, 2014*

**chemistry**

how many moles of BaCl2 are in 300 g of H2O if the molality is 0.2 m?
*November 25, 2014*

**Statistics **

Random samples of size n = 90 were selected from a binomial population with p = 0.4. Use the normal distribution to approximate the following probabilities. (Round your answers to four decimal places.) (a) P(p̂ ≤ 0.49) = (b) P(0.37 ≤ p̂ ≤ 0.49) = ...
*November 3, 2014*

**physics**

A diving bell has a weight of 30000 N when measured on shore. In the water, suspended by a cable, the tension in the cable is only 12000 N. What is the buoyant force, FB, on the diving bell when it is in the water?
*October 26, 2014*

**Math**

An urn contains 3 red, 4 orange, and 6 yellow marbles. 2 marbles are selected without replacement. Find the probability that the second marble selected is orange given that the first marble selected is yellow.
*October 13, 2014*

**Chemistry**

Molecular, ionic, and net ionic equations for ammonium chloride + potassium sulfate. Also what is the observation. Is it 2NH2Cl + Na2SO4 = (NH4)2SO4 + 2NaCl???? Please help!
*October 13, 2014*

**sociology**

Micah is studying child behavior in playgrounds throughout the world. He wants to see how the children react when teachers select the same child to be the first to use each piece of equipment. Which approach is Micah is using?
*October 8, 2014*

**chemistry**

A 22.0 g piece of alloy at 264.8°C is dropped into a simple calorimeter that contains 175.0 g of water. The temperature of the calorimeter water increased from 20.4°C to 23.1°C. Calculate the specific heat capacity of the alloy.
*October 6, 2014*

**math**

Solve the proportion for u. (u−2) : (u+3) = 4 : 3
*October 6, 2014*

**English check answers please!!**

"The King of Mazy May" by Jack London Which detail helps you predict that Walt will face a series of unfortunate events? a) Lifting clear on the crest of a great jam off Indian River, Walt masters met with his first accident b) The poor brute plunged in a heap, with ...
*October 4, 2014*

**Science**

relative age
*September 15, 2014*

**Science**

how can you determine that a coin is not pure silver if you know the mass and volume of the coin?
*September 10, 2014*