Friday

February 27, 2015

February 27, 2015

Total # Posts: 680

**stats**

A box contains 10 red balls and 20 blue balls. Three balls are selected at random one after the other from the box, without replacement. If the first two balls selected are both blue, what is the probability that the third ball selected is red?
*February 7, 2015*

**physics**

I was wrong i meant, 6)- 200
*January 27, 2015*

**physics**

Two towers(the towers are the same) are built next to each other. the distance between them is d and there height is 10,000d. a ball is thrown horizontally from one tower to the other with spped v=sqrt(gd/2). assuming the ball collied elasticlly with the wall, therfore his ...
*January 27, 2015*

**Math**

Although I am positive you are correct on the 8y part being +8y
*December 8, 2014*

**Math**

I found the answer to be y = (9x+9) / (10x+8) Please check to see if this is actually the correct answer.
*December 8, 2014*

**Math (Correction?)**

10xy-9x = 9-8y Wouldn't bringing 8y to the other side be 10xy+8y = 9+9x? not 10xy-8y = 9+9x
*December 8, 2014*

**Math**

f(x) = (9-8x) / (10x-9) f^-1(x) =
*December 8, 2014*

**algebra**

Develop a tree diagram for tossing two, eight-sided gaming dice to figure out how many possibilities there are. Discuss the purpose of using such a visual in working out probability.
*November 30, 2014*

**Physics**

The angular velocity of a wheel is given by w(t) = (2.00 rad/s^2)t + (1.00 rad/s^4)t^3. A. What is the angular displacement of the wheel from time t=0.00s to time t=T? B.What is the angular acceleration of the wheel as a function of time?
*November 23, 2014*

**Physics**

The angular velocity of a wheel is given by w(t) = (2.00 rad/s^2)t + (1.00 rad/s^4)t^3. A. What is the angular displacement of the wheel from time t=0.00s to time t=T? B.What is the angular acceleration of the wheel as a function of time?
*November 23, 2014*

**Math**

5/6 + 1/3 + 7/12
*November 20, 2014*

**MATH!!!**

4(1.5c+6)+-2c=-9
*November 19, 2014*

**Math **

sin theta = 8/17 and theta is in the second quadrant. Find sin(2theta),cos(2theta),tan(2theta) exactly sin(2theta) cos(2theta) tan(2theta)
*November 14, 2014*

**Math CHECK!**

I believe that it would be 25 / cos^2 theta but I am not entirely sure. or would i just add both
*November 14, 2014*

**Calculous**

Evaluate sin(theta) and cosine (theta) for the angle theta The graph gives you a point of (0.6,-0.8) on the x y coordinate plane with a radius of what appears to be 1 ( unit circle ) sin (theta) = cos (theta) =
*October 31, 2014*

**Math**

How do i find the length of a projection of a vector A=3x+y+2z on the xy plane? and how do i find the unit vector in the xy plane that is perpendiculer to vector A?
*October 31, 2014*

**Math**

a) prove the identity: Ax(BXC)=B(A*C)-C(A*B) A,B,C vectors x- cross product *-dot product b) use part a) to prove that cross product is not associative.
*October 31, 2014*

**physics**

How do i find the length of a projection of a vecor A=3x+y+2z on the xy plane? and how do i find the unit vecotr in the xy plane that is perpendiculer to vector A?
*October 30, 2014*

**physics**

How do i find the length of a projection of a vecor A=3x+y+2z on the xy plane? and how do i find the unit vecotr in the xy plane that is perpendiculer to vector A?
*October 28, 2014*

**math**

What to Do: Consider the following, and then do the calculations to solve (formulas and concept explanations in the book). Your business provides a service to local residents. Your fixed costs are $2,000 per month, and you expect 40 customers per month. The variable cost ...
*October 24, 2014*

**math**

Your business provides a service to local residents. Your fixed costs are $2,000 per month, and you expect 40 customers per month. The variable cost associated with each service is $35. 1. Using cost-based pricing and a markup of 20%, what should the price be? Show ...
*October 24, 2014*

**math**

What to Do: Consider the following, and then do the calculations to solve (formulas and concept explanations in the book). Your business provides a service to local residents. Your fixed costs are $2,000 per month, and you expect 40 customers per month. The variable cost ...
*October 24, 2014*

**math**

Your business provides a service to local residents. Your fixed costs are $2,000 per month, and you expect 40 customers per month. The variable cost associated with each service is $35. 1. Using cost-based pricing and a markup of 20%, what should the price be? Show ...
*October 24, 2014*

**hw**

A railroad car of mass m = 30000 kg moving at v1 = 2.9 m/s collides and couples with two coupled railroad cars, each of the same mass as the single car and moving in the same direction at v2 = 1.711 m/s. What is the magnitude of the kinetic energy lost in the collision? Answer...
*October 14, 2014*

**hw**

A 30-06 caliber hunting rifle fires a bullet of mass 0.00829 kg with a velocity of 662 m/s to the right. The rifle has a mass of 3.7 kg. What is the recoil speed of the rifle as the bullet leaves the rifle?
*October 14, 2014*

**physics**

A force of 3.25 N acts on a(n) 3.8 kg object for 16.5 s. What is the object’s change in momentum?
*October 14, 2014*

**Calc**

I need help finding the correct formula after finding the doubling time and continuous percentage. I got the doubling time of 24 days and the continuous percentage of 2.89%. Homework asking use the doubling time to find the continuous percent growth rate and give a formula of ...
*October 3, 2014*

**Science**

Help me unscramble the words acnsrl spgei
*September 14, 2014*

**Research Methods**

I have been racking my brain around standard deviation. I came to the conclusion it being a measurement of scores that entails a range of high or low due to the scores or variables. My question is: Why normality is required for standard deviation applicability?
*July 30, 2014*

**math**

Rich is 1.5 meters tall and cast a 0.75 meter shadow. At the same time a nearby flagpole cast a 3 meter shadow. How tall is the flagpole?
*May 21, 2014*

**Algebra Help!**

1.) The chief designer for a large automobile company is considering 4 different radiator grills, 2 different style of headlights, and 5 different rear fender designs. If an automobile style consists of a grill, headlight, and rear fender, how many different styles of ...
*May 8, 2014*

**Math Help!**

1. Find the 4th term in the binomial expansion.(2x + 3y)^6 2. Use synthetic division and the remainder theorem to find P(a). P(x)= x^5 + 3x^4 + 3x − 7; P(-1) 3. Factor the expression on the left side of the equation. Then solve the equation. x^6 + 128x^3 + 4096 = 0 4.) ...
*May 8, 2014*

**Math 120**

Drop a stone in a well, the sound is heard 17 seconds later. How deep is the well in feet
*April 27, 2014*

**psychology**

Traumatic events do not always result in a diagnosable psychological disorder What factors determine how a person may be affected by one such event?
*April 18, 2014*

**Math**

28+7=38 35-28=7
*March 1, 2014*

**Math**

The sum of two numbers is 35 and their difference is 7. What are the two numbers?
*March 1, 2014*

**math**

rene put 2 blue marbles, 2 green marbles, 2 red marbles and 2 white marbles in a bag, if Rene takes 1 marble out of the bag without looking, what is the probability of rene drawing a blue marble?
*January 30, 2014*

**math**

Find the next two numbers 6,12,9,18, 15 ___ ____
*January 22, 2014*

**Social study **

In the election of 1860 thr --- won the election votes of all the free state except a fraction of the New Jersey votes
*December 27, 2013*

**chemistry**

This is a simple stochiometric question first convert to grams using density. 2813(mL)*1.45(g/mL) = 4078.85g then convert this to moles of Nitroglycerin (requires molar mass) (4078.85g)/(227.087g/mol)= 17.96mol of C3H5N3O9 Next, use your mol ratios to convert to moles of M2 (...
*December 15, 2013*

**Algebra 1 (Reiny or Kuai)**

Hij gxtxt j. Ycg DIY I c. FDIC icy fix cig. GUI g,7 if. Go. Ty. G u yuc u. Uh c y yuck. U uuvugugv hub u uuvu y out u. UFO. Fig gxtxt cough y y y h yuc yucky tactic tvtc tort guff ft
*December 9, 2013*

**math**

how to find out y intercept on a graph and slope of the graph
*October 29, 2013*

**descrete and combinational math**

How do i write (x+ y /(z^2 + 3) )-xy as a polish notation ?
*October 28, 2013*

**Intro to Computers**

In computing, a single byte represents a. one unit of disk space b. a pixel on the monitor c. an on or off electronic switch d. a character of data
*October 11, 2013*

**physics**

How much work does the force of the pole do on the boat during the displacement?
*October 11, 2013*

**physics**

A boat of mass 120 kg floats in a stream. You push on the boat with a pole, exerting a force of (175 i hat - 145 j hat) N. The boat moves through a displacement dvec = (23.0 i hat - 8.0 j hat) m along a straight line.
*October 11, 2013*

**Statistics**

You are dealt a hand of three cards, one at a time. Find the probability that your third card is your first jack. A) 0.068 B) 0.145 C) 0.127 D) 0.077 E) 0.00018 How do I set this problem up?
*October 5, 2013*

**Statistics**

In an Intro Stats class, 57% of students eat breakfast in the morning and 80% of students floss their teeth. Forty-six percent of students eat breakfast and also floss their teeth. What is the probability that a student from this class eats breakfast given they floss their ...
*October 4, 2013*

**Statistics**

You are dealt a hand of three cards, one at a time. Find the probability that your third card is your first jack. A) 0.068 B) 0.145 C) 0.127 D) 0.077 E) 0.00018
*October 4, 2013*

**Statistics**

A package of self-sticking notepads contains 6 yellow, 6 blue, 6 green, and 6 pink notepads. An experiment consists of randomly selecting one of the notepads and recording its color. Find the probability that a green notepad is selected given that it is either blue or green. A...
*October 3, 2013*

**math**

All your answers are wrong. I suggest you do some research and find out the definitions of deductive and inductive reasoning and the differences between them. 1. Deductive 2. Inductive 3. Inductive
*September 28, 2013*

**math**

64*15 = 12n let n be number of workers divide both sides by 12 (64*15)/12 = (12n)/12 80 = n thus it takes 80 men to complete the job in 12 days.
*September 28, 2013*

**Science**

(kg*m/s2)/(m/s2) The m/s2 cancels out. Answer: kg
*September 27, 2013*

**phyics**

A car is traveling at a constant speed of 31.8 m/s on a highway. At the instant this car passes an entrance ramp, a second car enters the highway from the ramp. The second car starts from rest and has a constant acceleration. What acceleration must it maintain, so that the ...
*September 24, 2013*

**Algebra, easy problem**

Find the value of k so that the line containing the points (−4,1) and (k,−2) is perpendicular to the line containing the points (−9,5) and (−5,0).
*September 14, 2013*

**physics**

a crane drops a 1.0 kg steel ball onto a steel plate. the ball's speed just before impact is 2.0 m/s. if the average impact force is 300 N, and the ball is in contact with the plate for 0.01 seconds, what is the bounce back speed right after the impact.
*July 8, 2013*

**physics**

a cannon with mass of 2000kg fires a 10kg shell at an angle of 60 degrees above the horizontal. if the recoil velocity of the cannon across the level ground is 0.5 m/s what is the velocity of the cannon ball.
*July 8, 2013*

**physics**

a 1000 kg car with an average power of 100 kw accelerates from 0 to 50 m/s. how long does it take to accomplish this
*July 7, 2013*

**math**

___% of 3.75 =2
*May 31, 2013*

**math**

Solve for x sin2x=cos(x+30)
*May 19, 2013*

**Algebra**

An advertising agency conducted a survey and found that the number of units sold, N, is related to the amount a spent on advertising (in dollars) by the following formula: N = 6,500 + 400 ln a (a ≥ 1) How many units are sold after spending $1,000? (Round your answer to ...
*May 9, 2013*

**math**

776÷ (1/4 + 1/5)
*May 3, 2013*

**chemistry**

How many grams of dichloromethane result from reaction of 1.60 of methane if the yield is 48.8 ?
*April 9, 2013*

**algebra**

use distributive property to factore each expression 42q - 21
*February 24, 2013*

**Physics**

I've been stuck on this equation for a while and I don't know if i'm missing a key part to the equation.. i just need help! If the gravitational field strength at the top of Mount Everest is 9.772 N/kg, approximately how tall (in feet) is the mountain? F= g ( m1 x ...
*January 21, 2013*

**math**

Phil is making a 40-kilometer canoe trip. If he travels at 30 kilometers per hour for the first 10 kilometers, and then at 15 kilometers per hour for the rest of the trip, how many minutes more will it take him then if he travels the entire trip at 20 kilometers per hour?
*January 13, 2013*

**math**

Phil is making a 40-kilometer canoe trip. If he travels at 30 kilometers per hour for the first 10 kilometers, and then at 15 kilometers per hour for the rest of the trip, how many minutes more will it take him then if he travels the entire trip at 20 kilometers per hour?
*January 12, 2013*

**math**

Phil is making a 40-kilometer canoe trip. If he travels at 30 kilometers per hour for the first 10 kilometers, and then at 15 kilometers per hour for the rest of the trip, how many minutes more will it take him then if he travels the entire trip at 20 kilometers per hour?
*January 12, 2013*

**math**

Phil is making a 40-kilometer canoe trip. If he travels at 30 kilometers per hour for the first 10 kilometers, and then at 15 kilometers per hour for the rest of the trip, how many minutes more will it take him then if he travels the entire trip at 20 kilometers per hour?
*January 12, 2013*

**chem**

calculate the surface energy of 100 surface of niobium. The enthalpy of atomization of niobium is 745 kj/mol. express anser inunits of j/cm^2
*January 11, 2013*

**chem**

(a) What is the pH of 50 mL of a 0.2M glycolic acid aqueous solution after adding 5 mL of 0.25 M KOH? The pKa of glycolic acis is 3.83 at 25 âˆ˜C.
*January 11, 2013*

**intergrated math 1**

x2+7x+10
*December 14, 2012*

**AP Physics B**

system consists of a steal beam of mass M 68.4 kg and length L 1.84 m, with a 39.0-kg brass sphere attached at the right end of the rod, as shown below. BA a. Determine the moment of inertia of the system for rotation about an axis through the center of ...
*December 11, 2012*

**Math (trigonometry)**

Dnt knw
*December 2, 2012*

**Physics**

Thanks so much Elena !
*November 18, 2012*

**Physics**

answers in the back of the book are 6.9 x 10^-5 cm and 1.13 x 10^5 Hz
*November 18, 2012*

**Physics**

A film of magnesium fluoride (n=1.38), 1.25x10^-5 cm thick, is used to coat a camera lens (n=1.55). Are any wavelengths in the visible spectrum intensified in the reflected light? ---------------------------------------- Bats use the reflections from ultra-high frequency sound...
*November 18, 2012*

**Social Studies**

Thanks so much Ms. Sue! I definitely understand #1 with your example.
*November 2, 2012*

**math**

Shelly sews a blanket that has an area of 170 square feet. it has 30 square blocks, each the same size. What is the approximate length of each side of a block. a. 1 foot b. 2 feet c. 3 feet d. 4 feet I doubled checked and the problem is correct. I just can't figure it out.
*October 30, 2012*

**Finance**

Maybe....?
*October 25, 2012*

**Social studies**

I am learning about scarcity in my SS 6th grade and I am unsure about this question. Which sentence best tells the effect of scarcity on economics? A. Scarcity shapes decisions about how to distribute goods B. because resources are scarce consumers buy fewer goods C. Scarcity ...
*October 23, 2012*

**Political Science**

What are the factors that keep an ideology alive? How does an ideology survive through decades? Is it because of the people, economic structure of a state or simply that once an ideological concept has been developed that it cannot truly disappear?
*October 14, 2012*

**Science/chemistry**

Is PO3 a mixture or compound. Is MgCl a mixture or compound. Thanks
*October 14, 2012*

**Math**

A certain computer can perform 10 to the 5th power calculations per second. How many calculations can it perform in 10 seconds?
*October 11, 2012*

**Math**

If f(x)=ax^2+b f(-3)=-3 and f'(-3)=2 find the coefficients a and b.
*October 11, 2012*

**Algebra 2**

13/17
*October 10, 2012*

**Algebra 2**

The Denominator of a fraction exceeds the numerator by 4. When 3 is added to both the numerator and denominator, the fraction becomes 4/5. Find the fraction.
*October 10, 2012*

**Political Science**

What are the factors that keep an ideology alive? How does an ideology survive through decades? Is it because of the people, economic structure of a state or simply that once an ideological concept has been developed that it cannot truly disappear?
*October 10, 2012*

**Physics **

Marcy and joe are racing on their bikes. Starting from rest, if Marcy has an average acceleration of 5.7 m/s? for the first five seconds how fast was he traveling at the end of those five seconds?
*September 26, 2012*

**Language Arts**

What are the following sentences. 1. - Isn't it time for the ircus to come to town? - Interrogative sentence 2. Buy a ticket for each of us. - Imperative sentence 3. Should I get tickets for this weekend? Interrogative sentence 4. Check to see if everyone can go then. ...
*September 10, 2012*

**chemistry**

How much ethanol is required to make a 2L of a 70%ww solution?
*July 28, 2012*

**geometry**

Find the similarity ratio and the ratio of perimeters for two octagons with area 18 square inches and 50 square inches
*July 18, 2012*

**math**

compute the value of 0.2^-4 express answer numerically
*July 7, 2012*

**chemistry**

What is the wavelength of a photon that has an energy of E = 4.01×10^-19J ?
*July 7, 2012*

**Math**

The sum of the ages of a brother and sister is 27. If four times the brother's age is subtracted from three times the sister's age, the difference is 11. Express your answer in terms of the symbols b and s. 27=?
*July 7, 2012*

**math**

Julie spent $50 on a book. The cost of the book was $24 less than twice what she spent on a backpack. How much did the backpack cost?.
*July 7, 2012*

**chemistry**

what mass NaOH is required to react exactly with 25.0 ml of 3.0 M H2S04
*July 1, 2012*

**algebra1**

factor: 64a^2-48a+9
*June 30, 2012*

**Accounting**

What account class would cash prize payment be under? A. Operating expense B. Cost of Goods Sold C. Asset D. Expense E. Liability I'm stuck between A, B, D. Help. thanks.
*June 14, 2012*

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