# Posts by Matt

Total # Posts: 2,377

**chemistry-Buffer Q**

You have a solution of .5 L of 1.74g of NH3 and 4.15g of (NH4)2SO4. How many ml of 14M HCl is required for a pH of 9.00? I don't know how to go finish this one. I thought about figuring the concentrations of each (NH3, NH4), making an ice table and solving for the additino...

*November 14, 2011*

**astronomy**

At an average opposition, the Earth and Mars are separated by 0.52 AU. Suppose an astronomer observes Mars at opposition and that seeing blurs the images to a resolution of 1.0 seconds of arc. What is the smallest surface feature the astronomer would be able to resolve on Mars...

*November 14, 2011*

**english**

danke schoen

*November 14, 2011*

**english**

Are the following sentences fragments, run-on or complete sentences? 1.You better believe what I say to be true. 2.Listen carefully to what the teacher has to say. 3. I have always wanted to live in England, but I am afraid I will only get to visit at this point in time.

*November 14, 2011*

**Chemistry**

which contains the lowest % of hydrogen? HCl H3PO4 H2SO4 H20 is it HCL?

*November 13, 2011*

**Chemistry**

A sample of C3H8O that contains 200. molecules contains ________ carbon atoms.

*November 13, 2011*

**Chemistry**

True or false? 1 mole of ozone has 1.8 x 10^24 atoms? correct if wrong THANK YOU!

*November 13, 2011*

**Geometry**

If 3 us an element of A and 3 is not an element of B, then which of the following is NOT true 3 is an element of B complement 3 is an element of A union B 3 is an element of A intersect B

*November 13, 2011*

**Chemistry-Common ions**

Wow im an idiot XD thanks. And i don't want to be a nuisance, but how would i do the next question? 0.320M (NH4)2SO4 and 0.492M NH3 (Still looking for OH- conc) Would i find the H+ concentration from the double dissociation of the NH4compound? (i know how to find the oh ...

*November 13, 2011*

**Chemistry-Common ions**

Woooo! the easy way was correct c: Thanks man. But i still kinda don't know why you just doubled it. I thought it would havesomething to do witht he ice table and such since it was in the common ion+buffer chapter :s Care explaining or?

*November 13, 2011*

**Chemistry-Common ions**

c=Calculate the OH- conc in a solution containing 6.2x10(-3)M Ba(OH)2 and 1.00x10(-2)M BaCl2? I thought of using the BaCl2 conc to find the conc of Ba initially, then use that in the ice table for Ba(OH)2, and solve for OH. But i dnot think that's right. Help? :/

*November 13, 2011*

**Chemistry**

Predict whether the following reactions will be exothermic or endothermic A.] N2 (g) + 3H2 (g) --> 2NH3 (g) B.] S (g) + O2 (g) --> SO2 (g) C.] 2 H2O (g) --> 2 H2 (g) + O2 (g) D.] 2 F (g) --> F2 (g) Bond ________ ∆H˚ (kJ/mol) H-H _________ 432 N(triple)N ...

*November 9, 2011*

**Precal**

.Pump Jack Problem: An oil well pump jack is shown in Figure 3-9f. As the motor turns, the walking beam rocks back and forth, pulling the rod out of the well and letting it go back into the well. The connection between the rod and the walking beam is a steel cable that wraps ...

*November 8, 2011*

**Chemistry**

Calculate the mass ( in grams) of one mole of methane molecules (to .01 g)

*November 1, 2011*

**English**

I think intact is better but i'm not sure. Either one sounds just as rght to me.

*October 31, 2011*

**English**

The accident occurred on a/an ______ road A. intact B. enlisted C. isolated D. forging I know what all the words mean I just don't know which one is best. I thing it is wither isolated or intact. Help would be immensely appreciated.

*October 31, 2011*

**Probability**

Reformatted so that it's easier to read. I have a Statistics project due tomorrow on Combinatorics. Admittedly, while my math skills aren't too bad (I get 99th percentile on standardized tests and such), it has been a while since I last took a math class after a 2-year...

*October 30, 2011*

**Mathematics (Probability, Statistics, etc.)**

I have a Statistics project due tomorrow on Combinatorics. Admittedly, while my math skills aren't too bad (I get 99th percentile on standardized tests and such), it has been a while since I last took a math class after a 2-year lapse in education, so my skills are really ...

*October 30, 2011*

**Physics**

a) Density of H2O = 1E^3 = 1000kg/m^3 Pair = 101.3 = 101300 Pa Pwater = (Density of H2O)*Depth*gravity Ptotal = Pair + Pwater b) diameter = 33.1cm r = 1/2 diameter Area = pi*r^2 Force = Ptotal * Area

*October 27, 2011*

**Math**

When log s (as ordinate) is plotted against t (as abscissa) on linear paper, the graph is a straight line with slope of -2.1 and intercept of 1.5. Express the relationship between s and t as s = Aekt . If s represents a distance in meters and t a time in seconds, what are the ...

*October 25, 2011*

**Math**

Rewrite y = 5(10^(−3x)) in the form y = Ae^(mx). (i.e., determine A and m)

*October 25, 2011*

**Math**

Rewrite y = 5(10−3x) in the form y = Ae^(mx). (i.e., determine A and m)

*October 25, 2011*

**Math**

A pathologist, trying to identify a bacterial infection, places a sample in a growth chamber and measures 1000 bacteria at the end of day 5 of the test. From daily measurements, the growth rate of the number of bacteria is determined to be 5% per day. Note that: A linear ...

*October 25, 2011*

**Math**

Find a system of linear equations corresponding to the following augmented matrices: (a) 2 0 |0 3 −4 |0 0 1 |1 (b) 3 0 −2 |5 7 1 4 |−3 0 −2 1 |7 (c) 7 2 1 −3 |5 1 2 4 0 |1 (d) 1 0 0 0 |7 0 1 0 0 |−2 0 0 1 0 |3 0 0 0 1 |4

*October 25, 2011*

**Math**

Find the augmented matrix for each of the following systems of linear equations: (a) 3x1 − 2x2 = −1 4x1 + 5x2 = 3 7x1 + 3x2 = 2 (b) 2x1 + 2x3 =1 3x1 − x2 + 4 x3 = 7 6x1 + x2 − x3 = 0 (c) x1 + 2x2 − x4 + x5 =1 3x2 + x3 − x5 = 2 x3 + 7x4 =1 (d...

*October 25, 2011*

**Math**

Which of the following are linear equations in x1, x2 and x3? (a) x1 + 5x2 − (2^0.5)x3 =1 (b) x1 + 3x2 + x1.x3 = 2 (c) x1 = −7x2 + 3x3 (d) x1^−2 + x2 + 8x3 =5 (e) x1^3/5 − 2x2 + x3 = 4 (f) πx1 − (2^0.5)x2 + 13x3 = 7^1/3

*October 25, 2011*

**Physics**

A small aircraft has a flying speed of 200 km/h in still air. To make a trip from Saskatoon to Regina, a straight line distance on the map of 250 km, a pilot must first determine the wind velocity and then calculate what direction to fly (the 'heading') to compensate ...

*October 25, 2011*

**english**

Ingrate Credible

*October 25, 2011*

**Science**

You throw a rock horizontally off a cliff with a speed of 10 m/s. after 3.1 seconds, how far were you when threw the rock?

*October 21, 2011*

**physics**

im talking about the ones asked at 7:55 and 7:57...please

*October 20, 2011*

**math**

bob can u please answer my physics questions

*October 20, 2011*

**Math**

32 tiles left over

*October 20, 2011*

**algebra 2 word problem**

yes both are right

*October 20, 2011*

**aLgEbrA variable & expression**

your welcome

*October 20, 2011*

**aLgEbrA variable & expression**

yes those are correct

*October 20, 2011*

**Mathematics!**

A cereal factory has weekly fixed costs of $48,000. It costs $1.37 to produce each box of cereal. A box of cereal sells for $3.99. Express the profit function p(x) that gives the total weekly profit from x boxes of cereal.

*October 20, 2011*

**physics**

A ball is thrown horizontally from the top of a building 30.1 m high. The ball strikes the ground at a point 66.8 m from the base of the building. The acceleration of gravity is 9.8 m/s2 . Find the time the ball is in motion. Answer in units of s

*October 20, 2011*

**physics**

A ball is thrown horizontally from the top of a building 30.1 m high. The ball strikes the ground at a point 66.8 m from the base of the building. The acceleration of gravity is 9.8 m/s2 . Find the time the ball is in motion. Answer in units of s

*October 20, 2011*

**physics**

A ball is thrown horizontally from the top of a building 30.1 m high. The ball strikes the ground at a point 66.8 m from the base of the building. The acceleration of gravity is 9.8 m/s2 . Find the time the ball is in motion. Answer in units of s

*October 20, 2011*

**physics**

A long jumper leaves the ground at an angle of 22.1◦ to the horizontal and at a speed of 10 m/s. How far does he jump? The acceleration due to gravity is 9.8 m/s2 . Answer in units of m

*October 20, 2011*

**Physics**

rpm= 34.68

*October 20, 2011*

**physics**

The fastest recorded pitch in Major League Baseball was thrown by Nolan Ryan in 1974. If this pitch were thrown horizontally, the ball would fall 0.809 m (2.65 ft) by the time it reached home plate, 18.3 m (60 ft) away. The acceleration of gravity is 9.81 m/s2 . How fast was ...

*October 20, 2011*

**physics**

During a baseball game, a batter hits a pop- up to a fielder 78 m away. The acceleration of gravity is 9.8 m/s2 . If the ball remains in the air for 5.8 s, how high does it rise?

*October 20, 2011*

**Finance**

Consider the following two securities X and Y X y Return- 20.0% Return- 10.0% Standard Deviation- 20.0% Standard Dev 30% Beta- 1.50 Beta- 1.0 Risk-free asset Return- 5.0% Using the data from the table, what is the portfolio expected return and the portfolio beta if you invest ...

*October 19, 2011*

**Finance**

Nico Trading corporation is considering issuing long-term debt. The debt would have a 30 year maturity an a 10 percent coupon rate. In order to sell the issue, the bonds must be underpriced at a discount of 5 percent of face value. In addition, the firm would have to pay ...

*October 19, 2011*

**Finance**

____ in the beta coefficient normally causes____ in the required return and therefore ____ in the price of the stock, all else remaining the same. A. An increase, an increase, an increase B. An increase, a decrease, an increase C. An increase, an increase, an decrease D. A ...

*October 19, 2011*

**Finance**

Company- Ford Coupon-11.0 Maturity-July 31,2009 Last Price-65.50 Last Yield- ? EST Spread- 104 Est UST- 10 VOL.-5,100 Based on the table, what is the last yield for this bond?

*October 19, 2011*

**chemistry**

thank you!

*October 17, 2011*

**chemistry**

How many milligrams of magnesium palmitate will precipitate from 965ml of this solution when it is cooled from 50C to 25C? For Mg(C16H21O2)2, Ksp= 4.8x10(-12) at 50C and 3.3x10(-12) at 25C.

*October 17, 2011*

**Chemistry**

An experiment was done to determine the formula and formation constant of a metal ammine. The data were graphed giving a straight line plot with an equation of y = -5.9484x - 11.447. What is the correct forumla for this metal amine? M(NH3)6+ M(NH3)5+ M(NH3)4+ M(NH3)2+

*October 16, 2011*

**Organic chem 2**

Hello, I am having some trouble trying to reduce a benzene ring with a H3C-C=N-NH2 substituent, to a cyclohexane with the same substituent. The ring is attached to the carbon that is double bonded with the nitrogen. Apparently the hydrogenation, H2/1000psi with ru/rh at 100C, ...

*October 11, 2011*

**science**

Mercury is a heavy metal. Using atomic models and the periodic table of elements, explain why it belongs to this category of elements

*October 10, 2011*

**physics**

A compact disc spins at 2.8 revolutions per second. An ant is walking on the CD and finds that it just begins to slide off the CD when it reaches a point 3.1 cm from the CD's center. (a) What is the coefficient of friction between the ant and the CD? I don't understand...

*October 9, 2011*

**physics**

A 5kg box on a horizontal plane has a coefficient of kinetic energy of 0.2. The object is pulled on horizontally with a rope at 2 m/s^2. With 9.8m/s^2 gravitational force, what is the tension on the rope?

*October 6, 2011*

**physics**

Stickman is driving a dragster. He does the quarter mile in 4 seconds and at the finish line is speed is 100m/s. He deploys his parachute after he crosses the finish line and wished to slow to a speed of 10m/s in 10s. What diameter parachute does he need if the drag force is ...

*October 2, 2011*

**chemistry**

It takes 75 mL of 0.124 M KOH to neutralize 28.5 mL of H2SO4 solution. What is the concentration of the H2SO4 solution? Answer in moles/liter.

*October 1, 2011*

**math**

how do i find the answer to this expression 1.4 over 5.5 subtract 4.9 over 2.0

*September 26, 2011*

**math**

how do i find the answer to this expression 1.4 over 5.5 subtract 4.9 over 2.0

*September 26, 2011*

**math**

A model of a brdge is 1m long and 2.5% of the actual size of the bridge. How long is the actual bridge?

*September 25, 2011*

**Algebra II**

Right now we're doing systems of Linear Equations in Three Variables. It says to solve the following system: x - y + 3z = 4 x + 2y - z = -3 4x + 3y + 2z = -5 Whatever I try with this problem (and the others like it) it comes out wrong. I've had about one success. And ...

*September 20, 2011*

**Math**

1. Evaluate the indefinite integral ([6x^2 + 12x^(3/2) +4x+9]/sqrt x)dx. Answer = + C 2. Evaluate the indefinite integral (12sin x+4tan x)dx. Answer = + C 3. Evaluate the indefinite integral. (x^7)e^(x^8)dx. Answer = + C Thank you for helping.

*September 19, 2011*

**physical science**

which of the following statements correctly describes the substance with the formula KI?

*September 19, 2011*

**Algebra II**

Evaluate: ƒ(2) + 5 It says to use this graph to solve the equation: h t t p://i55 . t i n y p i c . com/2qdvfur.jpg Right now we're on Algebra and Composition with Functions. I have no idea what I'm supposed to do, and there are no instructions for any of these ...

*September 18, 2011*

**Physics**

A small source of light is located at a distance from a vertical wall. An opaque object with a height of moves toward the wall with constant velocity of magnitude . At time , the object is located at the source .

*September 15, 2011*

**math**

The answer should be 75 gray sweatshirts using the method that JJ explained.

*September 15, 2011*

**calculus**

show that if a, b & c are in v3, then (a cross b) dot [(b cross c)×(c cross a)] = [a dot (b cross c)]^2

*September 14, 2011*

**problem solving**

in a soccer tournament there are 22 entries. the tourney is single mathc elimination. that is 2 soccer teams compete at the same time and the loser is elimnated. how many games will be played to deterenmine chanmpioneship?

*September 12, 2011*

**ALGEBRA PLS HELP**

IS ANYONE AVAILABLE TO HELP TO SEE IF I DID THESE 5 PROBLMES OK?

*September 11, 2011*

**ALGEBRA PLS HELP**

CAN YOU CHECK IF IM RIGHT? |-2 +5 | ANSWER 7 |5| +4 ANSWER: 9 |-5| +4 ANSWER : 9 |5+2| ANSWER : 7 |3-7| ANSWER : -4

*September 11, 2011*

**English**

number 2 is c

*September 11, 2011*

**algebra**

1 |-2+5| 2 |5| +4 3 |-5| +4 4 |5+2| 5 |3 - 7| here are my answers: 1) 3 2) 9 3) 1 4) 7 5) 4

*September 11, 2011*

**algebra**

1) 3 2) 9 3) 1 4) 7 5) 4

*September 11, 2011*

**algebra**

fine each absolute value 5 quesitons: |-2+5| |5| +4 |-5| +4 |5+2| |3 - 7|

*September 11, 2011*

**Algebra 2**

6x=9y-21. 6y=4x+14 plz help...I can't figure out how to do this problem using linear equations with two variables

*September 11, 2011*

**science**

i need to make a taxonomic key for fruite apple orange strawberry banana can you help me with that

*September 10, 2011*

**chippewa**

FIND the ESTIMATE: 1) A RARE TRUFFLE ONCE SOLD FO $13.20 FOR A 0.44 OZ CAN. APPROXIMATELY HOW MUCH WOULD 1LB OF THIS TRUFFLE COST?

*September 5, 2011*

**math solution**

1200000*0.075*5+1200000

*September 3, 2011*

**math**

Angelo is paid double time for each hour he works over 40 hours in a week. Last week he worked 42 hours and earned $660. What is his normal hourly rate?

*September 1, 2011*

**math**

Scientists have calculated that the Moon's revolution around Earth is increasing by about .015 s per century. At this rate, how long would it take the length of a month to increase by one full day?

*September 1, 2011*

**7th grade math**

A diver dives from a platform with a height of 11m. What is the change in elevation if the depth of the dive is 4m?

*August 25, 2011*

**Algebra**

Sorry I forgot to put that the depth of the dive qas 4m. Somehow you need to figure out how to use the 11m and 4m in an equation.

*August 25, 2011*

**Algebra**

A diver dives from a platform with a height of 11 meters. What is the change in elevation of the dive?

*August 25, 2011*

**Algebra**

Adiver divies from a platform with a height of 11 meters. What is the change in elevation of the dive?

*August 25, 2011*

**Geometery**

thank you but how do you know the answer is d and not c?

*August 23, 2011*

**Geometery**

A circular region rotated 360 degrees around its diameter (serving as an axis) generates a a) cube b) rectangle c) cone d) sphere

*August 23, 2011*

**AP Chemistry**

I got 1054.9 as my answer. I reversed the first eq and did (1/K1^(1/2)) added it to reverse of second eq (1/K2) then added that to the 3rd eq times 2 (K3^2). This got me the right equation. Do I just multiply the new Kc values together to get the final Kc of the new equation?

*August 17, 2011*

**AP Chemistry**

Given: 2N2(g) +O(2) --> 2N2O(g) Kc =1.2x10^(-35) N2O4(g) --> 2NO2(g) Kc = 4.6x10^(-3) 1/2N2(g) + O2(g) --> NO2(g) Kc= 4.1x10^(-9) Calculate Kc for the reaction between one mole of dinitrogen oxide gas and oxygen gas to give nitrogen tetroxide gas.

*August 17, 2011*

**statistics**

You want to estimate the mean of a population within + 3 with 90 % confidence If the population standard deviation is = 8, how large of a sample is needed?

*August 14, 2011*

**History**

Can some one help me with these questions? Because Japan was hit by the worldwide economic depression in the 1930s, military leaders were able to gain power. Question 1 answers True False Question 2 text Question 2 After Japan withdrew from the League of Nations they aligned ...

*August 9, 2011*

**history**

What is the basic message of the Quran and when was it compiled.

*July 30, 2011*

**History**

How long did the roman civilization last?

*July 29, 2011*

**chemistry**

the temperature of a 20.0g sample of a metal(specific heat .03 J/g-C) is raised by 20C. How much heat has been absorbed by the metal?

*July 13, 2011*

**Physics**

I am having trouble with the last portion of this question. If someone can help me, I would sincerely appreciate it. A bicycle wheel has a radius R = 32.0 cm and a mass M = 1.82 kg which you may assume to be concentrated on the outside radius. A resistive force f = 147 N (due ...

*July 9, 2011*

**Physics**

I am having trouble with the last portion of this question. If someone can help me, I would sincerely appreciate it. A bicycle wheel has a radius R = 32.0 cm and a mass M = 1.82 kg which you may assume to be concentrated on the outside radius. A resistive force f = 147 N (due ...

*July 7, 2011*

**Algebra II**

Give the equations of any vertical asymptotes for the graphs of the rational functions. f(x)=(x-4)/(x²+7)

*July 7, 2011*

**Math**

Simplify: (4 - 5i)(3 + 2i)

*July 3, 2011*

**algebra II**

Simplify (-3i)^2

*July 3, 2011*

**Math**

The sum of the degree measures of the angles of a quadrilateral is 360. Find the measure of the fourth angle of each quadrilateral given the degree measures of the other three angles. 4x+12, 8x - 10, 6x+5

*June 30, 2011*

**chemistry**

25 x 0.2 = 5 5/1000= 0.005 moles

*June 21, 2011*

**Algebra**

you start a pet sitting service. you spend $35 on advertising. You plan to change $5 on a day to watch each pet. a) write an equation to relate your daily income y to the number of pets x you watch. b) how many days do you need to watch a pet to pay for advertising?

*June 16, 2011*