Thursday

October 20, 2016
Total # Posts: 2,621

**Chemistry**

What mass of calcium citrate, Ca3(C6 H5 O7)2, would a tablet manufacturer need to use to provide the same amount of Ca that you found in your tablet? (show calculations) The mass of Calcium for the experiment was .7374g We assumed that any solid that formed when Na2CO3 was ...

*October 17, 2016*

**Math**

What is the value of -3 + 4.5 - (-1.2)?

*October 17, 2016*

**Math Functions**

Hello. Could you please help with my math homework...? An online bookseller gives the following information for their shipping information: "The shipping and handing charge per order is $4, plus $1.50 per book." Let x = the number of books that someone orders. Let S(...

*October 17, 2016*

**chem **

For the reaction 2 N2(g) + 3 H2(g) → 2 NH3(g) which of the following can be determined using only the coefficients of the balanced chemical equation? the number of moles of NH3 obtained if 4.2 mol of N2 react completely to form NH3 the weight of NH3 obtained if 4.2 mol ...

*October 16, 2016*

**chem **

Using the balalnced chemical equation, how many grams of MgO are produced when 31.0 grams of O2 react completely with Mg? 2 Mg + O2 → 2 MgO Molar Mass Mg = 24.3 g/mol O2 = 32.0 g/mol MgO = 40.3 g/mol 55.7 78.1 89.1 111.3

*October 16, 2016*

**chem **

Using the balanced chemical equation, the number of moles of oxygen gas needed to react with 2.5 moles of Mg is __________. 2 Mg + O2 → 2 MgO

*October 16, 2016*

**Social Studies**

I have to search and compare these civilization... ･pre 20th century Japan ･Incan It's my Social Studies project😲💦 Would you recommend me some good websites in English?

*October 16, 2016*

**Science, Nature Sciencence, Nature Sciencence **

What type of evidence do scientists have that helps them to know what life was like in the past?

*October 15, 2016*

**Spanish**

Wow! Thank you very much Sra. that helped me a lot and I will learn from it so I can improve in the future.

*October 11, 2016*

**Spanish**

SraJMcGin can you please help me? Modifique el texto por cambiar los verbos italizados de lo familiar (informal) a lo formal Prepara (1) prepare para salir de viaje el lunes por la mañana. Para ello, haz (2) haga las maletas, sal (3) salga de la habitación y m&...

*October 11, 2016*

**Spanish**

Hello, I have corrected the issue and reposted it. Sorry about that.

*October 11, 2016*

**Spanish**

SraJMcGin can you please help me? Modifique el texto por cambiar los verbos italizados de lo familiar (informal) a lo formal Prepara (1) _____ para salir de viaje el lunes por la mañana. Para ello, haz (2) ______ las maletas, sal (3) _____ de la habitación y m&...

*October 11, 2016*

**Earth science**

If the volume in a graduated cylinder is raised from 50ml to 51 ml, what is the objects volume?

*October 9, 2016*

**Statistics**

A = 3000(1+((.03)/12))^(12)(9) Just plug that into a calculator

*October 9, 2016*

**Calculus I**

You are watching the Chicago marathon from your friend's apartment, 100 feet above the street. A runner passes the building at 11 feet/sec. Let d denote the distance between the base of the building and the runner, and let h denote the distance between you and the runner. ...

*October 9, 2016*

**Math**

A one-product company finds that its profit, P, in millions of dollars, is given by the following equation where a is the amount spent on advertising, in millions of dollars, and p is the price charged per item of the product, in ...

*October 9, 2016*

**statistics**

A STAT 200 instructor is interested in whether there is any variation in the final exam grades between her two classes Data collected from the two classes are as follows: Her null hypothesis and alternative hypothesis are: (a) Determine the test statistic. Show all work; ...

*October 7, 2016*

**Math**

I did binomcdf(22,.25,6) in my calculator. n=22, p=.25, x=6 Is this the correct process?

*September 18, 2016*

**Math**

Suppose a fair four-sided die is tossed 22 times. What is the probability of getting at most 6 fours?

*September 18, 2016*

**Chemistry**

If you had dehydrated 1.00g of the hydrate CaCl2 ∙6H2O how many grams of anhydrous CaCl2 would you expect to be produced? Show calculations. I really am having a hard time with this question. I don't know where to start and how to perform it.

*September 18, 2016*

**stats**

Find the z-scores for which 92 % of the distribution's area lies between minus z and z.

*September 18, 2016*

**Math**

I have a bag with 2 different kinds of objects: 17 cubes, 19 spheres. If I randomly pick from the bag 5 of these objects without return any of it, what is the probability of getting at least 1 of each kind?

*September 11, 2016*

**Pre-Calculus**

The minute hand of a clock is 3 inches long. How far does the tip of the minute hand move in 5 minutes? If necessary, round the answer to two decimal places.

*September 10, 2016*

**Math Precal **

An airplane has an airspeed of 650 km/h bearing 15 degrees north of west. The wind velocity of is 19 km/h in the direction of 30 degrees east of south. Find the resultant vector representing the path of the plane relative to the ground. What is the ground speed of the plane? ...

*September 6, 2016*

**math**

thank you got the answers correct

*August 29, 2016*

**math**

I need help figuring the grade for two students I keep getting a big number. *Note Final can replace a low exam grade 𝐺𝑅𝐴𝐷𝐸 = .15 ∗ (𝐷𝑎𝑖𝑙𝑦 𝑎𝑣𝑔) + .65 ∗ (𝐸...

*August 29, 2016*

**Bus. QA Compliance**

Need assistance with a project summarizing and analyzing a quality assurance program for a financial services company

*August 16, 2016*

**biology**

biology

*August 7, 2016*

**Science**

What does sc mean on all jewlry items

*August 6, 2016*

**Math**

What does sc mean on all jewlry items

*August 6, 2016*

**Math**

On Feb. 27th, 2010, an earthquake of magnitude 8.8 occurred off the coast of Chile lasting up to 3 minutes. Five months later, a 2nd earthquake occurred with magnitude of 5.3. How much more intense was the first earthquake compared to the 2nd earthquake?

*July 14, 2016*

**Chemistry **

Equation of Mg(OH)2 (aq) + KOH (aq) gives you what ?

*July 11, 2016*

**math**

the building supply store sells one liter bottles of water for $1.09 approximately how many 8 ounce servings of water in 1 liter

*July 11, 2016*

**chemistry**

What is the difference between the acid and base notation of a hydroxide? Give an example of the same molecular formula written in acid and base notation.

*July 6, 2016*

**financial management**

Angela Anderson is employed as a Tax Manager by Super Cell Phone Service, Inc. She earns $135,000 per year in this role, supervising a department of five Tax Accountants. Calculate the Medicare taxes that will be withheld from Angela’s annual salary assuming a tax rate of...

*June 12, 2016*

**English**

People who don’t know Harry tend to underestimate him. They cast a skeptical eye on his typical outfit: ragged jeans and shirts that bear evidence of his most recent meal. And his most frequently uttered expression, “Waaaal, I just don’t know,” can make ...

*May 24, 2016*

**Math**

suppose that when your friend was born your friends parents deposited $4000 in an account paying 4.1% interest compounded quarterly. what will the account balance be after 15 years?

*May 22, 2016*

**math**

a plat form and a building are on the same horizontal plane , the angle of depression of the bottom of the building from the top A of the platform is 39 degree. the angle of elevation of the top D of the building from the top of the platform is 56 degree. given that the ...

*May 12, 2016*

**Chemistry**

When chromium has 26 electrons, how many neutrons and protons does it have and what is it's standard notation

*May 10, 2016*

**Calculus**

Farmer Jones, and his wife, Dr. Jones, decide to build a fence in their field, to keep the sheep safe. Since Dr. Jones is a mathematician, she suggests building fences described by y=4x^2 and x^2+10. Farmer Jones thinks this would be much harder than just building an enclosure...

*May 6, 2016*

**Math 3**

How many times bigger is 8*10^6 than 2*10^2?

*May 6, 2016*

**Maths **

If a car weighing 1,054kg collides with another car and then takes 60 metres to come to rest can the speed at the pint of impact be calculated?

*May 6, 2016*

**Math**

it's 4 because 3+3=6 and 4+2=6

*May 4, 2016*

**Trig**

Problem: A cable from the top of a 60 foot high tower is to be attached to the ground (x) feet from the base of the tower. A) if the cable makes an angle of t radians with the ground when attached, express t as a function of x. B) if t = pi/5, how far is the end of the cable ...

*May 1, 2016*

**PHYSICS SPECIFIC GRAVITY**

A 6.8 kg block of some unknown material is suspended from a spring scale and submerged in water. The spring scale reads 48.0 N. What is the specific gravity of the block?

*April 25, 2016*

**science**

H2SO4 is labeled 93.2% and density 1.94g/cm3. Find moles in H2SO4?

*April 24, 2016*

**Chemistry**

Hello Dr. Bob, I see the mistake that I have made, but the initial values that were in my first sentence were given, I just think my coefficients in the equation were wrong. Do the answers at the bottom make sense though?

*April 23, 2016*

**Chemistry**

A flask initially contains 2.00 atm of NH3, 2.00 atm of N2, and 3.00 atm of H2 at 673 Kelvin. -What is the delta G for the reaction? -What is the equilibrium partial pressures of each gas at 673 Kelvin? So I figured out how to do the first question with relevant values: : ...

*April 23, 2016*

**Algebra**

7 – 5(2 – x) = –(x – 8) = 11/6

*April 19, 2016*

**Math**

Evaluate: -17 + 6 =

*April 19, 2016*

**math**

Lines a and b are parallel. When they are cut by transversals, they form a triangle. es025-1.jpg What is es025-2.jpg es025-3.jpg

*April 19, 2016*

**Chem**

Given the equation 2C8H18 + 25O2 = 16 CO2 + 18H2O: How many moles of oxygen gas (O2) are consumed upon combustion of 2.20 L of octane ( D = 0.703 g/mL)?

*April 10, 2016*

**Work**

A truck carrying a 57 kg crate accelerates uniformly from rest to 86.5 km/hr in 18.4 s. Calculate the work done on the crate by the truck (in J). I got 16454 J right. Now why is it positive? K-K = negative if Velocity from rest is 0.

*April 10, 2016*

**Block Colliding with a Spring**

I think there something wrong with the quiz, cuz it tells me its wrong. I tried 3.75N (work by spring) and also total work done. It shouldnt be, I got the 2 other questions right. Still, thank you.

*April 10, 2016*

**Block Colliding with a Spring**

A moving 1.60 kg block collides with a horizontal spring whose spring constant is 480 N/m. The block compresses the spring a maximum distance of 12.50 cm from its rest position. The coefficient of kinetic friction between the block and the horizontal surface is 0.480. What is ...

*April 10, 2016*

**PHYSICS CENTER OF MASS**

what is the .065??? same for y .065???

*April 10, 2016*

**chemistry **

A radionuclide undergoes alpha emission, and thorium-234 is produced. What was the original radionuclide?

*April 7, 2016*

**math**

Can you plz do callbck for 0799998736&0742239920 then i will call u as soon as i can to tell u anything about careers

*April 7, 2016*

**Math**

A student takes a true-false test exam with 10 questions. If the student guesses all ten questions, find the probability he gets 7 or 8 right. p(x=7) + p(x=8) (.5)^7(.5)^3 + (.5)^8(.5)^2 I have the correct answers which are .117+.044= .161 But when I calculate the answer on ...

*March 30, 2016*

**Chemistry**

A single dose of a certain antacid contains 250. mg of Mg(OH)2 and 300. mg of CaCO3. How many mmol of H+ can be neutralized by one dose of this antacid? Do not include units in your answer

*March 29, 2016*

**math**

the product of a number and five decreased by eight

*March 29, 2016*

**math **

use the unit circle to determine the exact value of each angle: sine 30 degrees, cosine pi, sine 11 pi divided by 6, and cosine 135 degrees.

*March 28, 2016*

**math**

find the values of cosine 21 degrees, and sine 3 pi divided by 10

*March 28, 2016*

**math**

The Washington monument is 555 feet high. If you are standing one quarter of a mile, or 1320 feet, from the base of the monument and looking at the top, find the angle of elevation to the nearest degree.

*March 28, 2016*

**math**

At a certain time of the day the elevation of the sun is 40 degrees. To the nearest foot, find the height of a tree whose shadow is 35 feet long.

*March 28, 2016*

**Math troubles**

I calculated them on my calculator so I borrowed my friends (since mine was messing up). I got P(x=3) = 5C3 .25^3 .75^2 = 0.008 P(x=4) = 5C4 .25^4 .75^1 = 0.003 P(x=5) = 5C5 .25^5 .75^0 = 0.0007 added up =0.01. Did I calculate correctly

*March 27, 2016*

**Math troubles**

There's 5 multiple choice questions on a quiz. Four choices to each question. Find the probability that the student gets 3 or more questions right. p(x=3) (.25)^3= 0.015 p(x=4) (.25)^4=3.906 p(x=5) (.25)^5=9.765 Do you add them all together to get the overall probability?

*March 27, 2016*

**Statistics**

There's 5 multiple choice questions on a quiz. Four choices to each question. Find the probability that the student gets 3 or more questions right. p(x=3) (.25)^3= 0.015 p(x=4) (.25)^4=3.906 p(x=5) (.25)^5=9.765 Do you add them all together to get the overall probability?

*March 27, 2016*

**Social Studies PLS HELP!!!**

Jury duty is A: a right because it is discussed in the u.s constitution B: a right because only some citizens are required to do it C: A responsibility because citizens do it to help protect other's rights D: A responsibility because judges cannot make decisions without ...

*March 24, 2016*

**math**

a nut mixture is made from two types of nuts: one type selling for 7.50/kg the other selling for 9.50/kg what mass of each type of nut should ne included in a 3 kg mixture that sells for 25

*March 24, 2016*

**Chemistry**

Using the Table of Thermodynamic Data calculate Kp at 500 K for the reaction 2 HI(g)-->I2(g) + H2(g) , if Kp at 300 K is 2.16x10-3 , assuming that delta H˚ is constant.

*March 23, 2016*

**Chemistry**

The Kp for the production of phosgene is 18.0. If one mole each of CO and Cl2 are mixed at the total pressure of 1 atm, what will be the partial pressure (in atm) of COCl2 after equilibrium is reached, CO(g) + Cl2(g)-->COCl2(g)

*March 23, 2016*

**Chemistry**

What is the entropy change of liquid glycol (in cal K-1 mol-1 ) when it freezes at -25 ˚C?the heat of fusion of glycol is 2688 cal mol-1 , and the specific heats of liquid and solid glycol are 33.8 and 20.1 cal K-1 mol-1 , respectively.

*March 23, 2016*

**Maths**

The probability a pupil takes a bus to school is 0.3. If a sample of 10 pupils are chosen at random. Using binomial distribution. Find the probability that a) exactly four pupils travel by bus. b) more than six pupils travel by bus.

*March 20, 2016*

**ratios/algebra**

During class elections 64 students voted for candidate A .if the ratio of votes for candidate a is to the votes for candidate B was 8:5,how many votes did candidate B receive?

*March 14, 2016*

**Science**

Heat ice from 20 to 32= 6BTUx5lb=30 Melt Ice at 32=144x5lb=720 Change temp of water from 32to160=128x5LB=640 30+720+640=1390 Correct? I think I got it. Thanks for the help. Cleared a lot of things up.

*March 13, 2016*

**Science**

How many Btu's are required to change five pounds of ice at 20°F to water at 160°F? a. 2,608 Btu’s b. 1,390 Btu’s c. 1,304 Btu’s d. 141 Btu’s I am trying ((160-20)x.5)x5 but not getting any of the possible choices. What am I missing? Thanks for ...

*March 13, 2016*

**Maths**

A drawer contains 8 brown socks and 4 black socks. A sock is taken a random from the drawer, its colour noted and replaced. This is done three times. If X is the discrete variable, the number of brown socks taken. Draw the probability distribution of X.

*March 13, 2016*

**statistics**

Case Study Chapter 6 and 7 FOR FULL CREDIT SHOW EQUATIONS USED AND WORK. ELEVATOR CAPACITY: Suppose an elevator has a maximum capacity of 16 passengers with a total weight of 2500 lbs. The mean weight of females is less than the mean weight of males so we will only look at ...

*March 7, 2016*

**Math**

need direction on part c. Rosa and her friend build & paint a tree house. On monday they paint 2/5 of the tree house. On tuesday they paint 3/7 of the house. A - painting of the house need to be finished on wednesday. how much more work do they have to do? 14/35 + 15/35=29/35 ...

*February 29, 2016*

**physics**

Calculate the heat given off by the hot water. GIVEN: Original quantity of water (hot water) 50g Orig.temperature :40°C Final temperature: 9°C Final quantity of water: 264g Increase in quantity of water 214g. PLEASE KINDLY SHOW ME THE EQUATION FOR THIS THANK YOU. <3

*February 28, 2016*

**physics**

Calculate the heat given off by the hot water. GIVEN: Original quantity of water (hot water) 50g Orig.temperature :40°C Final temperature: 9°C Final quantity of water: 264g Increase in quantity of water 214g. PLEASE KINDLY SHOW ME THE EQUATION FOR THIS THANK YOU. <3

*February 28, 2016*

**physics**

Calculate the heat given off by the hot water. GIVEN: Original quantity of water (hot water) 50g Orig.temperature :40°C Final temperature: 9°C Final quantity of water: 264g Increase in quantity of water 214g. PLEASE KINDLY SHOW ME THE EQUATION FOR THIS THANK YOU. <3

*February 28, 2016*

**physics**

Calculate the heat given off by the hot water. GIVEN: Original quantity of water (hot water) 50g Orig.temperature :40°C Final temperature: 9°C Final quantity of water: 264g Increase in quantity of water 214g. PLEASE KINDLY SHOW ME THE EQUATION FOR THIS THANK YOU. <3

*February 28, 2016*

**microeconomics**

4.00 or less .

*February 27, 2016*

**N/A**

The most basic software required for an online course where writing is involved is:

*February 23, 2016*

**Chemistry **

How many mL of 1.2 M HCl is needed to react with 5.8 g of Al(OH)3

*February 18, 2016*

**science**

A feather is dropped on the moon from a height of 1.40meters.The acceleration of gravity on the moon is 1.67m/s^2.Determine the time for the feather to fall to the surface of the moon.

*February 18, 2016*

**Math **

Kathy is y years old Find her age,if 1/2 of wat she was 3 years ago is equal to 1/3 of what she will be in 4 years time

*February 16, 2016*

**Assessment**

Authentic and performance assessments strive for greater realism and complexity of tasks under the premise that real-life problems can often be solved ______________.

*February 14, 2016*

**Math**

If Sam has 6 apples and Linda takes 12 apples how many apples does Jesica have?

*February 9, 2016*

**Trigonometric **

A woman standing on a hill sees a flagpole that she knows is 55 ft tall. The angle of depression to the bottom of the pole is 14°, and the angle of elevation to the top of the pole is 18°. Find her distance x from the pole.

*February 7, 2016*

**Physics**

A bat moving at 5 meters per second is chasing a flying insect, if the bat emits a 40 khz chirp and receives back an echo at 40.4 khz what is the speed of the insect and will the bat be able to catch the insect?

*February 2, 2016*

**Math**

I got A and B but i need C Suppose a ship is sailing at a rate of 35km/h parellel to a straight shoreline. The ship is 10km from shore when it passes a lighthouse at 11am. a) Let k be the distance between the lighthouse and the ship. Let d be the distance from the ship has ...

*February 1, 2016*

**Math**

I got A and B but i need C Suppose a ship is sailing at a rate of 35km/h parellel to a straight shoreline. The ship is 10km from shore when it passes a lighthouse at 11am. Question 6 a) Let k be the distance between the lighthouse and the ship. Let d be the distance from the ...

*February 1, 2016*

**COMP1**

Heading back to the states but on edge since he survived the tsunami FRAGMENT OR NO

*January 31, 2016*

**Math**

wait I'm confused with c what do i do or put

*January 27, 2016*

**Math**

So b) i would just say d=35km *t

*January 27, 2016*

**Math**

Thank you guys both of you!

*January 27, 2016*

**Math**

Someone answer all of this clearly, I don't get it at all. Suppose a ship is sailing at a rate of 35km/h parellel to a straight shoreline. The ship is 10km from shore when it passes a lighthouse at 11am. Question 6 options: a) Let k be the distance between the lighthouse ...

*January 27, 2016*