Tuesday

September 30, 2014

September 30, 2014

Total # Posts: 2,608

**Chemistry**

How many grams of HCl are produced if the following reaction yielded 27.1 grams of H3PO4? PCl5 + 4 H2O --> H3PO4 + 5 HCl
*September 30, 2014*

**Math**

Solve the following e^-x (square root((3e^2x) - 5/4)) = e^x
*September 29, 2014*

**Algebra**

How do I simplify this problem. (2nr - nr^2)r - (2nr - nr^2) . 2r
*September 28, 2014*

**physics**

An electron in the cathode ray tube of a tele- vision set enters a region where it acceler- ates uniformly from a speed of 30100 m/s to a speed of 3.82 × 106 m/s in a distance of 2.97 cm. What is its acceleration? Answer in units of m/s2
*September 28, 2014*

**Algebra**

Adding and subtracting polynomials. Can someone help me solve this problem? 5x^3 . 2x^2 - 10x^4 + 3x^5 + 3x .(-2)x^4 . = The dot means to multiply. Thank you.
*September 28, 2014*

**physics**

An electron, starting from rest and moving with a constant acceleration, travels 5.8 cm in 14 ms. What is the magnitude of this acceleration? Answer in units of km/s2
*September 28, 2014*

**Algebra 1**

Adding and subtracting polynomials. (6-t-t^4) + (9t+t^4) How do you solve this problem?
*September 27, 2014*

**Math**

I already know the angle of Eastdale which is 45° due to the turn from due east to the northwest. So therefore so I need to find the measures of angle c and angle n. I can use the Law of Sines. sin‹C/c=sin‹E/e sin‹C/18=(√2/2)/12.7308 sin‹C=18(&#...
*September 26, 2014*

**English**

What rites of passage do individuals confront in the selection my brothers keeper?
*September 25, 2014*

**Math**

Why would you use square roots in the following question: Chang is participating in a charity bicycle road race. The route starts at Centreville and travels east for 13 km to Eastdale. He then makes a 135° turn and heads northwest for another 18 km, arriving at Northcote. ...
*September 25, 2014*

**Math**

State the side length of a square with an area of 27 cm2 in simplified radical form.
*September 25, 2014*

**Math**

What is ^4 square root 1280r^8 t^12 in simplified form?
*September 25, 2014*

**Math**

What is the vertex of y=7(x+5)^2+4?
*September 24, 2014*

**math**

The school cafeteria serves pizza every 6th day and applesauce every day Thursday supposed to pizza and applesauce are both on today's menu in how many days will they be together on the menu again?
*September 23, 2014*

**Chemistry**

Since a hydrogen atom consists of just one proton and one electron, it should have a mass of 1.673 x 10^-24 g. And so it does. Calculate how many hydrogen atoms you'd have if you had 5.6 g of hydrogen.
*September 23, 2014*

**Math**

The sine ratio is positive in the first and what other quadrant?
*September 23, 2014*

**Math**

Two wires are connected to a tower at the same point on the tower. Wire 1 makes an angle of 45° with the ground and wire 2 makes an angle of 60° with the ground. b) Which wire is longer? Explain. (2 marks) c) If the point where the two wires connect to the tower is 35 ...
*September 23, 2014*

**Math**

The expression cos 60° is equivalent to sin ?
*September 23, 2014*

**Analytical Chemistry (Titrations)**

Is molarity also called the concentration of the solution? I got 0.1641 M HCl. Thank you for your help!
*September 23, 2014*

**Analytical Chemistry (Titrations)**

I forgot: What is the concentration of the solution?
*September 23, 2014*

**Analytical Chemistry (Titrations)**

About 10ml of concentrated HCl was transferred to a 1-L volumetric flash and diluted to mark with distilled water. When this solution was used to titrate a sample of pure sodium carbonate, Na2Co3, weighing 0.3054 gram, it took 35.09 ml to reach the methyl red end point. The ...
*September 23, 2014*

**Math**

Which of the following triangles cannot be solved using the sine law? a) angle a= 28 degrees, angle b= 75 degrees, side a= 24 cm b) side a=4 cm , side b= 11 cm c) angle a=28 degrees, angle c= 34 degrees , side b=5 cm d) angle b= 29 degrees, side b=5 cm, side c=18 cm
*September 22, 2014*

**physics**

In order to qualify for the finals in a racing event, a race car must achieve an average speed of 276km/h on a track with a total length of 1520m. If a particular car covers the first half of the track at an average speed of 246km/h, what minimum average speed must it have in ...
*September 21, 2014*

**physics**

A speedy tortoise can run at 0.08 m/s, and a hare can run 16 times as fast. In a race, they start at the same time, but the hare stops to rest for 2 min, so the tortoise wins by a shells(20cm). How long does the race take? Answer in units of s
*September 21, 2014*

**Math**

Solve the following triangle, rounding side lengths to the nearest tenth of a unit and angle measures to the nearest degree. angle a = 153 degrees, b= 5, a=10.5
*September 21, 2014*

**Math**

Marco is 350 m due east of the centre of the park. His friend Ray is 350 m due south of the centre of the park. Which is the correct expression for the exact distance between the two boys?
*September 20, 2014*

**Math**

The first prize in a lottery is $250 000. Each winner chosen after the first is paid 20% as much as the winner before them. Determine a formula for the sum of n terms of the geometric sequence.
*September 19, 2014*

**Math**

For each arithmetic sequence, determine a) the value of t1 and d (2 marks) b) an explicit formula for the general term (2 marks) c) t20 (2 marks) 3a, 3a – 2b, 3a – 4b, 3a – 6b, …
*September 19, 2014*

**Algebra 2**

ok I get it. But what's the actual answer
*September 19, 2014*

**Algebra 2**

determine all symmetries of the function g(x)=x/x-1
*September 19, 2014*

**Algebra**

so you don't know
*September 19, 2014*

**Algebra**

Given a point (-2,5), determine a point that satisfies the specified symmetry. 1.)Origin 2.)y-axis 3.)x-axis 4.)y=x
*September 19, 2014*

**Math**

Find the value of term 1 given S8 is equal to -3280 and the common ratio is equal to -3?
*September 19, 2014*

**Math**

a) the value of t1 and d (2 marks) b) an explicit formula for the general term (2 marks) c) t20 (2 marks) 3a, 3a – 2b, 3a – 4b, 3a – 6b, …
*September 18, 2014*

**Math**

b) an explicit formula for the general term (2 marks) c) t20 (2 marks) 7/4, 1, 1-4, -1/2
*September 18, 2014*

**Math**

For each arithmetic sequence, determine a) the value of t1 and d (2 marks) b) an explicit formula for the general term (2 marks) c) t20 (2 marks) 7/4, 1, 1/4, -1/2
*September 18, 2014*

**Math**

Determine whether each sequence is geometric, arithmetic, or neither. Justify your answer. 1/5, 1/4, 1/3,1/2,1
*September 18, 2014*

**Math**

Find the value of term 1 given sum 8= - 3280a and the common ratio = - 3?
*September 18, 2014*

**Math**

A Registered Education Savings Plan (RESP) earns interest at a rate of 5% per year, compounded annually. Jasmine’s parents invest $4000 in the account today. a) Determine an explicit formula to represent the value of the investment. (2 marks) b) Use your formula to write ...
*September 18, 2014*

**Math**

The first prize in a lottery is $250 000. Each winner chosen after the first is paid 20% as much as the winner before them. b) Determine an explicit formula for the general term. (2 marks) c) Determine a formula for the sum of n terms of the geometric sequence. (2 marks) d) If...
*September 18, 2014*

**Math**

If S1 = 0.7 and S2 = 2.1 in a geometric series, determine the sum of the first 12 terms in the series. Be sure to show all of your work.
*September 17, 2014*

**Math**

The sum of the first two terms of an arithmetic series is 15 and the sum of the next two terms is 43. What are the first four terms of the series?
*September 17, 2014*

**Math**

Etienne owns a small recycling company that picks up empty glass bottles from restaurants. At the first restaurant, he picks up 50 bottles. At each restaurant after this, he picks up 4 more bottles than he picked up at the restaurant before. Assume that this pattern continues...
*September 17, 2014*

**Math**

What is the sum of the infinite geometric series 15 + 15(1/3)+ 15(1/3)^2 + 15(1/3)^3?
*September 17, 2014*

**Math**

The sum of the geometric series 9 + 45 + 225 + 3 515 625 is ?
*September 17, 2014*

**Math**

An explicit formula for the general term for the arithmetic sequence 7/4,1, 1/4, -1/2?
*September 17, 2014*

**Math**

The first prize in a lottery is $250 000. Each winner chosen after the first is paid 20% as much as the winner before them. a) Determine t1 and r for the geometric sequence that represents this situation. b) Determine an explicit formula for the general term. c) Determine a ...
*September 17, 2014*

**Math**

Consider the arithmetic series 7 + 19 + 31 + 43 + 55 + pr004-1.jpg. a) How many terms are less than 1000? (3 marks - show your work) b) How many terms are less than 2000? (3 marks - show your work)
*September 16, 2014*

**Math**

Determine the sum of the infinite geometric series 28 + 14/3 + 7/9 + 7/54 ?
*September 16, 2014*

**math**

Suppose someone gives you 8 to 2 odds that you can not roll two even numbers with the roll of two fair dice. This means you win $8 if you succeed and you lose $2 if you fail. What is the expected value of this game to you? Should you expect to win or lose the expected value in...
*September 15, 2014*

**Physics 1 **

You are to drive to an interview. The interview is at 11:15 a.m. You plan to drive at , so you leave at 8:00 a.m. to allow some extra time. You drive at that speed for the first , but then construction work forces you to slow to for . What would be the least speed needed for ...
*September 11, 2014*

**Physics**

A tennis player hits a ball 1.6 m above the ground. The ball leaves the racket with a speed of 12 m/s at an angle 8.0 degrees above the horizontal. The net is a horizontal distance of 7.0 m away from the player and is 1.0 m high. (a.) Does the ball clear the net? Explain how ...
*September 10, 2014*

**Physics1**

3, I got it thank you!
*September 10, 2014*

**Physics1**

A vector is drawn with its tail at the origin of an xy coordinate system. In which quadrant does the vector point if the angle with respect to the positive direction of an x axis is -135°?
*September 10, 2014*

**math**

Find an equation of the line that satisfies the given conditions. Through (−7, −12); perpendicular to the line passing through (−4, 0) and (0, −2)
*September 7, 2014*

**Chemistry**

59.0 mL of a 1.60 M solution is diluted to a total volume of 268 mL. A 134-mL portion of that solution is diluted by adding 111 mL of water. What is the final concentration? Assume the volumes are additive.
*September 7, 2014*

**Advanced algebra**

In which distributions does the variable, X, have a binomial distribution? (Choose all that are correct) When a 6-sided number cube is rolled 3 times, X is the number of 2s rolled. When a 6-sided number cube is rolled, X is the number of times rolled before a 2 appears. When a...
*September 5, 2014*

**Advanced algebra**

In which distributions does the variable, X, have a binomial distribution? (Choose all that are correct) ~When a 6-sided number cube is rolled 3 times, X is the number of 2s rolled. ~When a 6-sided number cube is rolled, X is the number of times rolled before a 2 appears. ~...
*September 5, 2014*

**English 10**

What poetic devices were used in the poem "What Was Told, That"? What did these poetic devices do for this poem? Did these devices help create imagery or communicate the author’s feelings? Please and thank you!
*September 5, 2014*

**ethics**

B if you're theories and literature anchors on the developmental side of humans A if you're doing research on experimental psych
*September 4, 2014*

**algebra**

all real numbers that are greater than -6 but less than 6. i kinda get it but im confused with the symbols(<,>) i dont now which ones greater or which ones less its confusing
*September 4, 2014*

**Chemistry**

When a 1.1 gram ice cube is placed into a 10.0 mL graduated cylinder, the level of water inside the graduated cylinder raises 1.20 mL. What is the Density of the ice cube? My Work: Density = 1.1g/10.0 mL + 1.20 mL? my answer came out to be; Density= .0982 g/mL
*September 3, 2014*

**Biology**

PCSK9, a protease that regulates the level of LDL receptors, is a new target for lowering circulating levels of LDL. Excess PCSK9 leads to a decrease in LDL receptor levels. Which one of the following tools would you use in mice to model a potential therapy for humans with ...
*September 2, 2014*

**Algebra 2**

5.) A boat makes a trip downstream in 5 hours. The return trip against the current takes 12 hours. If the speed of the current is 3 1/2 km/h, what is the speed of the boat in still water? 6.) How far does the boat referred to in Exercise 5 travel (one-way)?
*August 31, 2014*

**Algebra 2**

Worldwide Airlines flies from Lakeside to Whichitfalls in 4 hours with a tail wind, The return trip against the wind takes 5 hours. Whichitfalls is 5040km from Lakeside. Find the speed of the plane and the velocity of the wind. Would you get on the plane?
*August 31, 2014*

**English 12**

Which character is described in these lines? (10 points) Lord of the Scyldings, this single petition? Not to refuse me, defender of warriors, Friend-lord of folks, so far have I sought thee, That I may unaided, my earlmen assisting me, This brave-mooded war-band, purify Heorot...
*August 30, 2014*

**Physics**

Larry leaves home at 9:03 and runs at constant speed to the lamppost(200 yards from the start). He reaches the lamppost at 9:07, immediately turns, and runs to the tree(1200 yards from the start). Larry arrives at the tree at 9:13. What is Larry’s average velocity, in ...
*August 27, 2014*

**physics**

Calculate the wavelength (in m) of a photon capable of exciting an electron in Li2+ from the state n= 3 to the state n=5 1.4239*10^-7 - correct
*August 26, 2014*

**physics**

ok.. thanks c:
*August 26, 2014*

**physics**

Precision refers to the closeness of two or more measurements to each other... Accuracy refers to the closeness of a measured value to a standard or known value.... So would it be precise and accurate?
*August 26, 2014*

**physics**

sorry. not precise and not very accurate not precise but very accurate precise and accurate precise but not very accurate (i think its this one)
*August 26, 2014*

**physics**

You measure the mass of a 500 g standard on your balance four times. You get values of 455 g, 456 g, 454 g, and 455 g. Which of the following best describes your balance?
*August 26, 2014*

**Chemistry**

Calculate the maximun=m mass of ethanol that can be made from 5.6 tonnes of ethen
*July 28, 2014*

**earth science**

Which of the following is not an example of a mineral crystal shape? A. Pyrite B. Kryptonite C. Quartz D. Calcite i think its A am i right
*July 26, 2014*

**Physics**

A small charged sphere,A, carries 4 times the charge of another sphere B. When these are placed 4.5 cm apart, they experience a force of 0.016N attraction between them. Find the charge on B.
*July 24, 2014*

**chemistry**

How many milliliters of a 0.100 M NaOH solution are required to neutralize 25.0 milliliters of 0.150 M HCl? Select one: a. 25.0 ml b. 37.5 ml c. 125 ml d. 167 ml
*July 24, 2014*

**physics**

Fred and George who are identical twins (same body mass) are competing in aerial skiing. Fred hits the take off with a speed of 20 whereas George has a speed of 8.5. How much higher will Fred go?
*July 20, 2014*

**Chemistry**

What quantity of heat is required to convert 200g of ice at 0.00C into water at 50C? I know that im suppose to use the E=mc(Delta T) but im not sure how...
*July 17, 2014*

**Algebra**

The height of an object after it is released can be modeled by the function f(t)=-16t^2+vt+s, where t is the n? The height of an object after it is released can be modeled by the function f(t)=-16t^2+vt+s, where t is the number of seconds after the object is released, v is the...
*July 7, 2014*

**algebra**

Each person will have exactly the same amount over time because each invested $10,000 at an average interest rate of 7%. Tasha’s investment will yield more over many years because the amount invested at 8% causes the overall total to increase faster. Thomas’s ...
*July 7, 2014*

**algebra**

Tasha invests $5,000 annually at 6% and $5,000 annually at 8%. Thomas invests $10,000 annually at 7%. Which statement accurately compares the two investments if interest is compounded annually?
*July 7, 2014*

**Algebra**

thanks!!
*July 7, 2014*

**Algebra**

A toy rocket that is shot in the air with an upward velocity of 48 feet per second can be modeled by the function f(t)=-16t^2+48t , where t is the time in seconds since the rocket was shot and f(t) is the rocket’s height. What is the maximum height the rocket reaches? ...
*July 7, 2014*

**chemistry**

Yes I get it thanks Dr.
*July 7, 2014*

**chemistry**

Balance by oxidation method the SO2 + MnO4+H2O --MnSO4+H2SO4+SO4(-2)
*July 7, 2014*

**Algebra**

Evan washes two types of vehicles. It takes him 30 minutes to wash a car and 40 minutes to wash a truck. He charges $12 to wash a car and $15 to wash a truck. In 270 minutes, Evan made $105 washing cars and trucks. How many trucks did Evan wash?
*July 4, 2014*

**algebra**

A chicken farm orders bags of feed from two farmers. Store X charges $20 per bag, and store Y charges $15 per bag. The farm must obtain at least 60 bags per week to care for the chickens properly. Store Y can provide a maximum of 40 bags per week, and the farm has committed to...
*July 4, 2014*

**Algebra**

A sports memorabilia store makes $6 profit on each football it sells and $5.50 profit on each baseball it sells. In a typical month, it sells between 35 and 45 footballs and between 40 and 55 baseballs. The store has no more than 80 footballs and baseballs in stock during the ...
*July 3, 2014*

**pre cal **

what are the real and imaginary zeros of the equation 2x^3 + 5x^2 - 3x + 7
*June 23, 2014*

**pre cal**

f(x) = two divided by quantity x squared minus two x minus three Graph A coordinate axis scaled by one. Domain and Range : _____________________ x and y Intercept(s) : _____________________ Horizontal Asymptote(s) : ___________________ Vertical Asymptote(s) : ...
*June 23, 2014*

**pre cal**

Choose the point on the terminal side of -45°
*June 23, 2014*

**math**

Give an example of a rational function that has no horizontal asymptote and a vertical asymptote at x = 1.
*June 23, 2014*

**algebra**

There are 5 red marbles for every 25 blue ones. How many red marbles are there in a group of 600 marbles?
*June 23, 2014*

**Highcschool**

Which one of the characters you read about is 12 years old? A. The narrator’s daughter in “The Yellow Wallpaper” B. Ginger Nut in “Bartleby” C. Lily Dyer in “A New England Nun” D. The son of the old man in “The Tell-Tale Heart
*June 15, 2014*

**Math**

Action Video rents only action and horror films. Over one 7 day period, they rented 5 horror films for every 9 action films. If they rented 99 action films, what was the mean number of films they rented per day?
*June 13, 2014*

**geometry**

Thanks for your help Reiny.
*June 11, 2014*

**geometry**

In a triangle, the measure of the first angle is four times the measure of the second angle. The measure of the third angle is 84 degrees more than the second angle. what is the measure of the first angle?
*June 11, 2014*

**high school algrebra 1**

Thank You!
*June 10, 2014*

**high school algrebra 1**

A youth group is planning a trip to a local amusement park. They are taking a van which holds 10 people. It will cost $25 for parking and tickets to enter the park are $18 per person. create an equation for this situation
*June 10, 2014*

**History**

When did the US pull out of the Vietnam War? Some sources say 1973 and then others say 1969..?
*June 8, 2014*

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