Tuesday

September 16, 2014

September 16, 2014

Total # Posts: 375

**Maths**

What point is the apex of a bridge?
*September 15, 2014*

**Physics - Grade 10**

Grant stands 3 meters from the check out at the grocery store holding a 20N bag of potatoes for 10 minutes. How much work does he perform?
*September 14, 2014*

**statistics**

DO I NEED TO USE 2-TAILED OR 2-TAILED RESULTS? WHY? A researcher believed that 2 hours per week of intensive exercise would result in significant weight loss after 12 weeks on the schedule. Accordingly, he weighed a group of 50 subjects before and after the 12 week exercise ...
*August 3, 2014*

**statistics**

1. A class of 10 students all received a 90 on the final exam. What is the standard deviation?_________
*August 3, 2014*

**geometry**

Use the information below to find the missing measure such that . AB = 35, DE = 14, DF = 22, , AC = ?
*June 25, 2014*

**Science**

What form of pollution, if any, does each energy source cause? How does the economy influence energy source choices? How does location influence energy source choices?
*June 13, 2014*

**Math**

thanks!
*June 13, 2014*

**Math**

oh oh.....
*June 13, 2014*

**Math**

idk
*June 13, 2014*

**Math**

WHY?
*June 13, 2014*

**Math**

Evaluate the following expressions: a. 11^0 b. 11^2 / 11^2 c. are the answers to parts a and b the same? Explain why or why not?
*June 13, 2014*

**Science**

Thank you so much !! Now I understand! Thanks guys!
*June 5, 2014*

**Science 1 More! Help**

Identify any challenging conditions that you may encounter on your mission; this may include near vacuum conditions, extreme temperatures, and microgravity. Explain how you will overcome these challenges with the design of your spacecraft. I don't understand what does this...
*June 5, 2014*

**Science**

OK, Now I understand. thanks Ms. Sue & Damon for the help!
*June 5, 2014*

**Science**

Identify the benefits that your space mission might provide for modern society. Explore the possibility of connecting your space mission with satellites that are already gathering information as they orbit Earth. I don't understand what does this mean?
*June 5, 2014*

**social studies**

Please Help!
*June 3, 2014*

**social studies**

How did the Fugitive Slave Act and the Kansas-Nebraska Act further divide the North and South? What role did the concept of popular sovereignty play in these conflicts? Do you think there was any way to avoid the violence that came out of this era?
*June 3, 2014*

**Math**

list three different ways to write 5^11 as the product of two powers. Explain why all three of your expressions are equal to 5^11
*June 3, 2014*

**Math ~ Check Answers ~**

Thanks
*June 3, 2014*

**Help Is It Like This Which one the top or the bottom one!!! help check my answers**

Help Is It Like This Which one the top or the bottom one!!! help check my answers
*June 3, 2014*

**Math ~ Check Answers ~**

y = mx + b f(x) = 2m + b = 1 f(x) = 4m + b = 0 f(x) = 6m + b = -1 -1(2m + b = 1) 4m + b = 0 -2m -b = -1 4m + b = 0 2m = -1 m = -1/2 2(-1/2) + b = 1 -1 + b = 1 -1+ 1 + b = 1 + 1 b = 2 y = mx +b y = -1/2x + 2
*June 3, 2014*

**Math ~ Check Answers ~**

Explain how to write a function rule from the table below. Then write a function rule. X: 2 | 4| 6 | And: 1 | 0 | -1 | My Answer: y = -1/2 x But, -1/2 (2) = -1, and y(2) = 1, so we need to add 2 at the start. So, y = 2 - 1/2 x
*June 3, 2014*

**Science**

What form of pollution, if any, does each energy source cause? How does the economy influence energy source choices? How does location influence energy source choices?
*May 28, 2014*

**Health**

nutrition is the process of the body using foods that we eat in order to sustain life true or false
*May 27, 2014*

**Science**

2. Adding a _______________ to an electric circuit would increase the magnetic field around a wire. a.) insulator b.) solenoid c.) resistor d.) conductor My Answer: conductor
*May 21, 2014*

**Science -Check Answers-**

1. A kitchen ceiling light has five light bulbs on it. When one of the lights goes out, the other four bulbs stay lit. This is an example of a series circuit. True OR False My Answer: True 2. Adding a _______________ to an electric circuit would increase the magnetic field ...
*May 21, 2014*

**Math ~ Check Answers ~**

lol
*May 8, 2014*

**Math ~ Check Answers ~**

***PS: I can't put the diagram so I type it.*** The diagram below shows the contents of a jar from which you select marbles at random. Inside the jar there is 16 marbles. Inside the jar there is 4 red marbles. 7 blue marbles. 5 green marbles. a. What is the probability of ...
*May 8, 2014*

**Steve, Anonymous**

Steve, Anonymous
*May 8, 2014*

**Math**

is it correct?
*May 8, 2014*

**Steve, Anonymous,**

(a) 4/16 * 7/16 = 0.109375 (b) 4/16 * 7/15 = 0.11666666666
*May 8, 2014*

**Steve, **

(a) 4/16 * 7/16 (b) 4/16 * 7/15 I need to find the answer?
*May 8, 2014*

**Math**

***PS: I can't put the diagram so I type it.*** The diagram below shows the contents of a jar from which you select marbles at random. Inside the jar there is 16 marbles. Inside the jar there is 4 red marbles. 7 blue marbles. 5 green marbles. a. What is the probability of ...
*May 8, 2014*

**Math**

Thanks!
*May 8, 2014*

**Math ~ Check Answers ~**

Is this correct? total bands: 185 P(pink) = 95/185 P(brown) = 90/185
*May 8, 2014*

**Math**

A box contains 95 pink rubber bands and 90 brown rubber bands. You select a rubber band at random from the box. Find each probability. Write the probability as a fraction in simplest form. a. Find the theoretical probability of selecting a pink rubber band. b. Find the ...
*May 8, 2014*

**Math**

A box contains 95 pink rubber bands and 90 brown rubber bands. You select a rubber band at random from the box. Find each probability. Write the probability as a fraction in simplest form. a. Find the theoretical probability of selecting a pink rubber band. b. Find the ...
*May 7, 2014*

**physics**

find the moment of inertia of the earth. Radius is 6,000 km and mass is 6 x 10^24 kg
*May 6, 2014*

**Math**

You have to choose a battery brand to use in your smoke alarm. Company A's batteries have a mean lifespan of 1.2 years, with a standard deviation of 0.1 years. Company B's batteries have a mean lifespan of 1.5 years, with a standard deviation of 0.9 years. Which brand ...
*April 29, 2014*

**Permutations**

1. 4! a.) 3 b.) 6 c.) 12 d.) 24****** 2. 5! a.) 25******** b.) 120 c.) 250 d.) 625 5. Five friends are having their picture taken. How many ways can the photographer arrange the friends in a row? a.) 150 b.) 100 c.) 120******* d.) 80 6. How would you apply the fundamental ...
*April 25, 2014*

**Math ~ Check Answers ~**

A number cube with the numbers 1 through 6 is rolled. Find P (number is greater than or equal to 3). a.) 4/6 b.) 1/6 c.) 2/6********** d.) 5/6
*April 23, 2014*

**state of matter**

why solid is the least amount of energy?
*April 22, 2014*

**Math ~ Check Answers ~**

1. There are 35 marbles in a bag: 9 blue marbles, 8 green marbles, 4 red marbles, 8 white marbles, and 6 yellow marbles. Find P (red). Write the probability as a fraction in simplest form, a decimal, and a percent. a.) 4/31, 0.129, 12.9% b.) 4/35, 0.114, 11.4%*********** c.) ...
*April 21, 2014*

**Chemistry**

I understand now, thanks a lot!
*April 20, 2014*

**Chemistry**

Given the equilibrium reaction N2(g) + 3 H2(g) <---> 2NH3(g) + heat, an increase in temperature will: a) Increase the value of K b) Decrease the value of K c) Increase or decrease the value of K depending upon the concentration of reactants d) Will have no effect on the ...
*April 20, 2014*

**Chemistry**

If the equilibrium constant for a reaction A + B <----> C + D is K, which is true of the equilibrium constant K* for the reaction C + D <----> A + B under the same conditions? A) K* = K B) K* = 1/K C) K* = 1 - K D) K* = 1 - (1/K) E) K* = 1 + K
*April 20, 2014*

**Planets- I Love Space!**

why the outer planets did not lose the lighter gases in their atmospheres.?
*April 14, 2014*

**Chemistry**

Na, Ca, Zn, Al, Mn
*April 10, 2014*

**Math ~ Check Answers ~ASAP**

3. In the following list of data, find the range: 21, 28, 31, 35, 39, 43, 51, 60. 35 37 39****** 40 Pat recorded the weights of the first 10 fish she caught and released at Mirror Lake this season. The weights were 8 lb, 6 lb, 9 lb, 6 lb, 7 lb, 5 lb, 7 lb, 6 lb, 23 lb, and 6 ...
*March 20, 2014*

**Science**

1. In the following diagram, the green ball changes direction after colliding with the red ball because the red ball has more momentum. True <---- False 2. What is the momentum of a 20.0 kg scooter traveling at 5.00 m/s. 4.00 kg m/s 20.0 kg m/s 25.0 kg m/s 100 kg m/s <...
*March 17, 2014*

**Science -Check Answers-**

1. In the following diagram, the green ball changes direction after colliding with the red ball because the red ball has more momentum. True <---- False 2. What is the momentum of a 20.0 kg scooter traveling at 5.00 m/s. 4.00 kg m/s 20.0 kg m/s 25.0 kg m/s 100 kg m/s <...
*March 17, 2014*

**Math ~ Check Answers ~**

So... is the 1st one is correct? A rectangular prism has a width of 92 ft and a volume of 240 ft^3. Find the volume of a similar prism with a width of 23 ft. Round to the nearest tenth, if necessary. •3.8 ft^3 •60 ft^3 <<<<<< •15 ft^3 •10....
*March 12, 2014*

**Math ~ Check Answers ~**

A rectangular prism has a width of 92 ft and a volume of 240 ft^3. Find the volume of a similar prism with a width of 23 ft. Round to the nearest tenth, if necessary. •3.8 ft^3 •60 ft^3 <<<<<< •15 ft^3 •10.4 ft^3 A pyramid has a height of...
*March 12, 2014*

**Math**

The diameter of a circular pizza is 24 in. How much pizza is eaten (in square inches) if half of it is consumed?
*March 3, 2014*

**Algebra 2 Help**

1.) Solve for x. 2x(x - 12) = -40 2.) Solve for x. 3x2 + 2x = 12 - 7x 3.) Simplify the expression. 8sqrt[-63] 4.) Find the absolute value of the complex number. Abs Val [7 + 24i] 5.) Simplify the expression. [4 - 7i] + [2 + 3i] Thank you so much!! :)
*February 28, 2014*

**Algebra 2**

1.) Solve for x. 2x(x - 12) = -40 2.) Solve for x. 3x2 + 2x = 12 - 7x 3.) Simplify the expression. 8sqrt[-63] 4.) Find the absolute value of the complex number. Abs Val [7 + 24i] 5.) Simplify the expression. [4 - 7i] + [2 + 3i] Thank you so much!! :)
*February 28, 2014*

**Math ~ Check Answers ~**

? ? ? ? ? ? ? ? A system of linear equations is shown below. 5X = 3y - 2 y = X + 4 What is the x -coordinate of the solution? a.) 2 b.) 4 ***** c.) 5 d.) 1 Jean needs to graph the function below. y = 7x ^2 + 8x -6 How many times should the graph of this function intersect the ...
*February 18, 2014*

**Math ~ Check Answers ~**

A system of linear equations is shown below. 5X = 3y - 2 y = X + 4 What is the x -coordinate of the solution? a.) 2 b.) 4 c.) 5 d.) 1 ***** Jean needs to graph the function below. y = 7x ^2 + 8x -6 How many times should the graph of this function intersect the x-axis? a.) 3...
*February 18, 2014*

**Social Studies--Check My Answers Please--**

OK, thanks guys!
*February 14, 2014*

**Social Studies--Check My Answers Please--**

1. During the election of 1824, which candidate won the popular vote and which candidate won the presidency? a.) Andrew Jackson; John Quincy Adams ***** b.) Andrew Jackson; Andrew Jackson c.) John Quincy Adams; John Quincy Adams d.) John Quincy Adams; Henry Clay 2. Some ...
*February 14, 2014*

**Social Studies--Check My Answers Please--**

7. "In 1831 Lowell was little more than a factory village. Several corporations were started, and the cotton-mills belonging to them were building. Help was in great demand; and stories were told all over the country of the new factory town, and the high wages that were ...
*February 13, 2014*

**Social Studies--Check My Answers Please--**

OH Ms. Sue I have 3 more can you also check them too?
*February 13, 2014*

**Social Studies--Check My Answers Please--**

Oh really, Wow! OK, then. Thanks Ms.Sue! for checking!
*February 13, 2014*

**Social Studies--Check My Answers Please--**

Are my answers are correct? Please check them! 1. Which of the following helped to increase the populations of northeastern cities? A) More diversity B) successful cotton crops C) growth of factories and trade***** D) building of the Erie Canal 2. A boundary was set between ...
*February 13, 2014*

**Chemistry**

Yep, I caught it. Thanks for your help!
*February 11, 2014*

**Chemistry**

It makes senses that the molar mass would be smaller than that of CH4 if it diffuses faster. 1/2 = square root of 22/88 = 22 g/mol ?
*February 11, 2014*

**Chemistry**

I used the formula given and came up with 352 g/mol, would that be correct?
*February 11, 2014*

**Chemistry**

A gas diffuses twice as fast as CF4 (g). The molecular mass of the gas is: I'm not sure how to figure this out without the rates of diffusion.
*February 11, 2014*

**Math**

if a 16 ounce can of soup costs 64 cents, what is the cost for each ounce of soup?
*January 29, 2014*

**physics**

A 5.0 kg \rm kg, 52-cm \rm cm-diameter cylinder rotates on an axle passing through one edge. The axle is parallel to the floor. The cylinder is held with the center of mass at the same height as the axle, then released. a)What is the magnitude of the cylinder's initial ...
*December 6, 2013*

**Alg 2**

It did help. Thank you so much! cx
*October 25, 2013*

**Alg 2**

The value of y varies directly with x. If y = 64 when x is 16, what is x when y is 288?
*October 25, 2013*

**English**

In the following sentence identify the appositive or appositive phrase and the noun or pronoun defined by the appositive. Mr. Murray, the Scoutmaster, likes to hike. Appositive? Noun or pronoun defined?
*October 1, 2013*

**Chemistry**

How to calculate Q in Nernst Equations, we used 0.10M solutions in all of our half cells. Nernst equation: Ecell = E0cell - RT/nF ln Q Overall reactions: Cu(s) + Pb2+(aq) ~ Cu2+(aq) + Pb(s) and 3Pb(s) + 2Al3+ ~ 3Pb2+ 2Al(s) Thank you!
*May 14, 2013*

**Chemistry**

Using your experimental data, calculate E0cell. Standard voltaic cells contain 1M solutions, but we used 0.10M solutions in all of our half cells. Use the Nernst equation to calculate the standard cell potential (E0cell) from your measured Ecell and Qrxn. Data: Nernst Equation...
*May 14, 2013*

**Math**

An airplane is flying at an altitude of 6 miles and passes directly over a radar antenna. When the plane is 10 miles away, the radar detects that the distance is changing at a rate of 240 mph. what is the speed of the plane? This is an implicit differentiation problem
*May 13, 2013*

**chemistry**

No. this is the sample I did. Cu+(s)+/Cu2+aq)//Al3(aq)+/Al(s) is this right? Anode = Cu+(s)+/Cu2+(aq) - +0.337 Cathode = Al3+(aq)+/Al(s) - -1.66 Overall redox reactions: -0.337 - -1.66 = 1.323?
*May 8, 2013*

**chemistry**

A. Find and list all of the different half- cell combinations. Hint 15 combinations! 1. Copper/ Cu2+ 2. Lead/ Pb2+ 3. Magnesium/ Mg2+ 4. Zinc/ Zn2+ 5. Iron/Fe2+ 6. Aluminum/ Al3+ B. write the half reactions of each combination and the overall redox reaction. Please help! Thank...
*May 8, 2013*

**Chemistry **

What is the Ka of the amino acid serine if it is 34.5% dissociated at pH- 9.46?
*May 4, 2013*

**Chemistry**

ok thank you!
*April 30, 2013*

**Chemistry**

dG=? . how do I start this problem? Do I use dG= -RT*ln*K? dG=-(0.008314 kj/k*mol) (61+ 273.15) ln (29.24)?? I tried this and it is wrong.
*April 30, 2013*

**Chemistry**

DrBob222, I don't know how to solve this problem either. And yes, this is the question for this problem. I even double check it. Please help. Chloroform (CHCL3) has a normal boiling point of 61 'C and an enthalpy of vaporization of 29.24 kJ/mol. What is the value of ...
*April 30, 2013*

**Chemistry**

Chloroform (CHCL3) has a normal boiling point of 61 'C and an enthalpy of vaporization of 29.24 kJ/mol. What is the value of delta Gvap (in kJ) at 61'C for chloroform?
*April 30, 2013*

**Chemistry**

I realized where I made a mistake for this problem. This time, I got this one right. Thank you so much!
*April 30, 2013*

**Chemistry**

The following thermodynamic data was obtained for an unknown compound. Delta Hvap = 31.3 kj/mol and Delta S Vap= 79.7 kj/mol .Calculate the normal boiling point of this compound in Celcius.. Thank you! Chemistry - DrBob222, Tuesday, April 30, 2013 at 12:31am dG = dHvap - ...
*April 30, 2013*

**Chemistry**

At 20 degree celsius, Ka for an unknown monoprotic weak acid is 0.00088. Calculate the Delta G (in kJ/mol) for the reaction of this unknown acid with water. HA(aq) + H2O(l) <--> H3O+(aq) + A-(aq)
*April 30, 2013*

**chemistry**

Calculate the enthalpy of fusion of naphthalene (C10H8) given that its melting point is 128 Celsius and its entropy of fusion is 47.7 J (k*mol) .
*April 29, 2013*

**chemistry**

Given that for the vaporization of benzene Hvap= 30.7 kj/mol and Svap= 87.0 J(K * mol) , calculate Delta G (in kJ/mol) for the vaporization of benzene at 13 Celcius.
*April 29, 2013*

**Chemistry**

The following thermodynamic data was obtained for an unknown compound. Delta Hvap = 31.3 kj/mol and Delta S Vap= 79.7 kj/mol .Calculate the normal boiling point of this compound in Celcius.. Thank you!
*April 29, 2013*

**Chemistry**

Calculate the molar solubility of MgCO3 in a solution that already contains 1.7×10−3 M sodium carbonate. MgCO3 Ksp = 6.82 x 10-6 IMPORTANT NOTE: You must use the quadratic equation to solve this problem. (DrBob222- thank you so much for all your help!)
*April 26, 2013*

**Chemistry**

how did you get (that's 0.17M x 1/2 = 0.085M)
*April 24, 2013*

**Chemistry**

What is the ph at the equivalence point for a titration of 250 mL of 0.17M piperidine with 0.17 M nitric acid. (piperidine: Kb = 1.3 x 10-3)
*April 23, 2013*

**Chemistry**

Consider the titration of 41.2ml of 0.230 M HF with 0.220 M NaOH . Calculate the ph after the addition of 11.9ml of sodium hydroxide.(HF: Ka = 3.50 x 10-4) Please, I need step by step on on how to solve this type of problem. Thank you very much!
*April 23, 2013*

**Chemistry**

A 17.6ml sample of a monoprotic acid is titrated with 0.212M NaOH. If 69.2ml of base is required to reach the equivalence point, what is the concentration of the acid?
*April 19, 2013*

**social studies**

what wiped out most of the indigenous population of australia
*April 8, 2013*

**Physics**

Sammy Sosa
*March 19, 2013*

**Math**

There are 16 cubic boxes of erasers in a case. What are all the possible dimensions for a case of erasers ? please help need in 30 minutes or less so confused help please thanks
*March 10, 2013*

**Chemistry**

what is the freezing point of 16.7g of LiCl in 136g of water, assuming complete dissociation for water kf= -1.86/mol
*February 26, 2013*

**Chemistry**

what is the freezing point of 16.7g of LiCl in 136g of water, assuming complete dissociation for water kf= -1.86/mol
*February 26, 2013*

**Chemistry**

what is the freezing point of 16.7g of LiCl in 136g of water, assuming complete dissociation for water kf= -1.86/mol
*February 26, 2013*