Saturday

April 30, 2016
Total # Posts: 7,557

**Math**

x + y = 16 x - y = 15 add the two equations 2x = 31 so x= 31/2 or 15 1/2 So then y = 1/2
*January 4, 2016*

**U.S. History**

I agree with B.
*January 4, 2016*

**Social Studies**

I did a google search using 1943 riots Detroit and LA and got several great sources for you to use. It explains that problems started in LA and then Detroit had similar issues caused by race.
*January 4, 2016*

**Math**

It is hard to tell sometimes, but an arithmetic sequence would have the same number added or subtracted. That doesn't seem to be the case. A could way to check for a geometric sequence is to divide the first number by the second. I divided 3888 by 216 and got 18. Next try ...
*January 4, 2016*

**Maths**

Do you mean? (3x+2)/5 minus (2x + 3)/3 = 3 If so: Multiply by 15 to clear the denominators. since 5 goes into 15 3 times you have 3(3x+2) Since 3 goes into 15 5 times you have 5(2x+3) and 3 times 15 = 45 9x+6 - (10x+15) = 45 9x + 6 - 10x -15 =45 -x -9 =45 -x = 54 so x = -54 ...
*January 4, 2016*

**Maths**

If I am reading your problem correctly, I would say that h/45 = tan 25 degrees. Find the tan of 25 and multiply times 45 to get the height.
*January 4, 2016*

**math**

What is the sum of all values of x that satisfy the equation (x2 -5x+5)x2 +4x-60 =1? Hint: There are three cases to consider I think I figured out 2 of the cases. The first one being x2 +4x-60=0 while x2 -5x+5=whatever. The second is x2 -5x+5=1 and x2 +4x-60=whatever. But I ...
*January 3, 2016*

**English**

ms sue I have a question about a assignment I have to do can you help me?
*January 3, 2016*

**math**

Formula for distance to the horizon for a satellite in orbit. d = sqrt(2rh+h^2) d = distance to the horizon h = height above sea level for the observer. r = radius of the earth ---------------------------------- Solve for h. ie. so I can plug in d and r and get a solution for h.
*December 30, 2015*

**Algebra I**

Factor the numerator and factor the denominator. Then cancel like factors. Which is 3x + 1 Note, you removed the -6 so that the terms in your factor will be positive and match the denominator's factor.
*December 30, 2015*

**Math**

ax^2 + bx + c = y To find the solutions you let y = 0. x^2 + 6x + 9 = 0 x^2 + 7x + 12 = 0 x^2 - 4 = 0 x^2 + 4 = 0 Solve these and you will have your answer.
*December 30, 2015*

**physics**

It takes 2.75s for the rock to hit the water at 54.45mph, how high is the bridge?
*December 25, 2015*

**7TH GRADE MATH**

yes 9
*December 22, 2015*

**Math **

2.The price of products may increase due to inflation and decrease due to depreciation. Derek is studying the change in the price of two products, A and B, over time. The price f(x), in dollars, of product A after x years is represented by the function below: f(x) = 72(1.25)x ...
*December 19, 2015*

**Social Studies**

A quick google search will tell you if the Bighorn sheep can be found in New Zealand.
*December 18, 2015*

**Social Studies**

A google search of Kiwi Bird... tells us they are nocturnal.
*December 18, 2015*

**Physics**

Two springs are set up on a table. The longer spring has a spring constant of 221 N/m and an initial length of 44.0cm. The shorter spring has a spring constant of 725 N/m and an initial length of 22.0cm. How far above the table is an 9.30kg ball when it reaches its equilibrium...
*December 17, 2015*

**Physics**

while walking behind a horse, a rancher walks 18.0 m (290degrees), then 25.0 m (340degrees) and finally 14.0 m (130 degrees) A)Calculate the displacement of the rancher b) if the rancher walks for 10 min, what is the average velocity of the walk?
*December 17, 2015*

**English**

Thankyou
*December 16, 2015*

**English**

What event (or events) mainly caused the fall of the British Empire? A. World War II B. the colonies rose up and fought back against the empire C. infighting between the British leaders caused it to implode from within D. both World War I and World War II My first choice (a.) ...
*December 16, 2015*

**chem equilibrium**

Determine the pH of a buffer that is prepared by mixing 100 mL of 0.2 M NaOH and 150 mL of 0.4 M acetic acid assuming the volume is additive. Calculate the pH of the solution when 0.5 mL of 1 M of HCl was added hence calculate the buffer capacity.(Given:pKa of acetic acid = 4....
*December 15, 2015*

**math **

A meat department manager discovrs that she can sell m(x) killograms of ground beef in a week, where m(x) = 14 700 - 3040x, if she sells it at x dollars per kilogram. She pays her supplier $3.21/kg for the beef. a) Determine an algebraic expression for P(x), where P(x) ...
*December 14, 2015*

**Physics**

A 0.01 kg Styrofoam ball is released from rest 2m above the floor. It reaches a speed of 3m/s the moment before it hits the floor. How much heat due to air resistance is generated during this process?
*December 13, 2015*

**Calculus**

A spherical balloon is being inflated so that, at the time when the radius is 5m, the radius is increasing at the rate of 0.15m/s. (A) Find the rate of increase of the volume at this time. (B) If the rate of increase of volume thereafter remains constant, find the rate at ...
*December 13, 2015*

**math**

x = amount at 4% 10,000 -x = amount at 3% I = Prt Interest for amount at 4% is .04x since time is 1. Interest at 3% is .03(10000-x) the 4% interest is $246 more .04x = .03(10000-x) +246
*December 12, 2015*

**science**

The range is always a maximum if the angle is 45 degrees.
*December 12, 2015*

**Algebra**

Usually, time would be on the x-axis. slope is change in y/change in x slope = (6-4)/(45-30) slope = 2/15 miles/minute
*December 12, 2015*

**Algebra**

We need to see the graph. An easy way to make a match is to look for the intercepts and to check the slope. To make the equation easier to work with, I would multiply through by a -12 8x + 3y = -4 If x = 0 they y = -4/3 If y = 0 then x = -1/2 look for the points (0, -4/3) and...
*December 12, 2015*

**Physics**

never mind, i think i found my mistake. 521m/s is the final velocity, not initial. thanks guys
*December 12, 2015*

**Physics**

A bullet leaves a rifle with a muzzle velocity of 521 m/s. While accelerating through the barrel of the rifle, the bullet moves a distance of 0.840 m in 0.003 seconds. Determine the acceleration of the bullet. So I basically used the formula: Change in position= (Initial ...
*December 12, 2015*

**Algebra**

Draw the graph of y = 6x by filling in the table below. X| y = 6x ---------- -2| -1| 0| 1| 2| Domain = ? Range = ?
*December 12, 2015*

**Math**

if i have read 150 pages of a 240 page book, what percentage of the book have I read?
*December 10, 2015*

**Math**

In the expression ln(3-x)+ln(3+x) what is the highest possible number that x can be? I got to this point: ln(9-x^2) but what now? it seems to me that there is an asymptote at x = 3, so the answer is 2.9999999... but it can't be repeating because that would make it 3, ...
*December 10, 2015*

**Algebra**

Use the formula pH = −log[H^+] 9.. The hydrogen ion concentration of a substance is 4.3*10^-6 × moles per liter.Find the pH. Round to the nearest tenth. 10. Find the hydrogen ion concentration of a solution whose pH is 5.3.
*December 10, 2015*

**Math**

a plane flies 1.5 hours at 110 mph on a bearing of 10°. it then turns and flies 8.5 hours at the same speed on a bearing of 100°. How far is the plane from its starting point?
*December 10, 2015*

**Algebra**

Richey Loaner inherited $2105.22 from a not-so-rich uncle. If Richie deposits his money into an account that pays 3% compounded continuously for t years, then the function A(t)=2105.22e^0.03t gives the account balance after t years. (a) Find Richie’s account balance 6 ...
*December 10, 2015*

**Chemistry **

is delta S positive for the heating of water from 25 to 75 degrees Celsius?
*December 10, 2015*

**Physics**

How do you calculate V^2 ?
*December 10, 2015*

**Physics**

Thanks Damon
*December 10, 2015*

**Physics**

An arrow is fired horizontally at a speed of 50m/s from the top of a vertical cliff overlooking the sea. The height of the cliff is 12m. Determine The speed and angle to the horizontal of the arrow when it enters the sea?
*December 10, 2015*

**Mathematics**

An arrow is fired horizontally at a speed of 50m/s from the top of a vertical cliff overlooking the sea. The height of the cliff is 12m. Determine The speed and angle to the horizontal of the arrow when it enters the sea?
*December 10, 2015*

**maths**

0.6 of the children in a club are girls, if there are 27 girls, how many children are there
*December 9, 2015*

**Algebra**

Find the missing coordinate if (-2/3, is a solution of -6x + 7y = 11
*December 9, 2015*

**Physics**

I cant tell if ur srs or not? This seems like some taliban stuff
*December 7, 2015*

**chemistry**

Help me solve it. Step by step please The value of kp at 20°c for the reaction 2NO(g) +Cl2(g) 2NOCl(g) is 1.9x10^3 atm-1 calculate the value of KC at the same temperature.
*December 6, 2015*

**Physics**

A gas cylinder has a volume on 200l, and contains Nitrogen at a pressure of 200kPa and a temperature of 290 degrees Kelvin. The molar mass of Nitrogen is 14.0067g. Calculate. The number of moles in the gas cylinder?
*December 4, 2015*

**Chemistry**

The highest temperature ever recorded in Palm Desert, California, was 122„aF. Express this temperature in degrees Kelvin.
*December 4, 2015*

**Mathematics**

Determine the points of intersection of the curve: y=(7-4x)/(x-4) and the line y=2x-1
*December 3, 2015*

**Math**

Tickets to science exposition cost $5.75 each for students and $7.00 for adults. How many students and adults went if the ticket charge was $42.75?
*December 2, 2015*

**math**

A company has a policy of retiring company cars; this policy looks at number of miles driven, purpose of trips, style of car and other features. The distribution of the number of months in service for the fleet of cars is bell-shaped and has a mean of 55 months and a standard ...
*November 30, 2015*

**math**

A company has a policy of retiring company cars; this policy looks at number of miles driven, purpose of trips, style of car and other features. The distribution of the number of months in service for the fleet of cars is bell-shaped and has a mean of 55 months and a standard ...
*November 30, 2015*

**math**

A company has a policy of retiring company cars; this policy looks at number of miles driven, purpose of trips, style of car and other features. The distribution of the number of months in service for the fleet of cars is bell-shaped and has a mean of 56 months and a standard ...
*November 30, 2015*

**math**

The average resting heart rate of a population is 89 beats per minute, with a standard deviation of 13 bpm. Find the z-scores that correspond to each of the following heart rates. Round your answers to the nearest hundredth, if necessary. (a) 95 bpm Z= (b) 69 bpm Z=
*November 30, 2015*

**math**

The average resting heart rate of a population is 89 beats per minute, with a standard deviation of 13 bpm. Find the z-scores that correspond to each of the following heart rates. Round your answers to the nearest hundredth, if necessary. (a) 95 bpm Z= (b) 69 bpm Z=
*November 30, 2015*

**math**

Alicia Martin's savings account has a principal of $1,200. It earns 6% interest compounded quarterly for two quarters
*November 30, 2015*

**Statistic**

an insurance policy sells for $700. based on past data, an average of 1 in 80 policyholders will file a $10,000 claim, an average of 1 in 120 policyholders will file a $20,000 claim, and an average of 1 in 200 policyholders will file a $50,000 claim. what is the expected value...
*November 28, 2015*

**Programming**

Declare Integer count For count=1 to 3 Step 2 Display count End For What would the output be?
*November 26, 2015*

**Algebra**

Year Number of Graduates (in millions) 2009 15.4 2010 15.9 2011 16.3 2012 16 2013 15.7 a. Code the years using t = 1 for 2009 and fit a quadratic function to the data with the regression program on your calculator. equation is ________________________________ b. Predict the # ...
*November 25, 2015*

**Physics**

What is the mass of a copper wire that will give a wire, 0.20mm in diameter, a resistance of 400 ohms can you please show me the formulas
*November 25, 2015*

**Physics**

Three charges are located along the x axis as shown in the drawing. The mass of the -1.2 uC is 4.0×10^-9 kg. Determine the magnitude and direction of the acceleration of the -1.2 uC charge when it is allowed to move if the other two charges remain fixed. I need help ...
*November 25, 2015*

**Algebra**

9.The following table gives the number of graduates in health professions in the U.S. for various years. Year Number of Graduates (in millions) 2009 |15.4 2010 |15.9 2011 |16.3 2012 |16 2013 |15.7 a. Code the years using t = 1 for 2009 and fit a quadratic function to the data ...
*November 24, 2015*

**Algebra**

The Yellow Pencil Company sells the best pencils ever made. If the cost of producing x hundred pencils is given by C(x)=0.4x^2-29x+44 and if the revenue generated from the sale of x hundred pencils is R(x)=-0.6x^2+19x. Money is in thousands of dollars. (a) Show all work to ...
*November 24, 2015*

**Algebra**

During the first part of a canoe trip, May paddled 20 km up steam and 20 km back in a total time of 5 hrs. The speed of the river is 3 km/hr. Find May’s speed in still water. Set up the equation first then solve.
*November 24, 2015*

**Algebra**

The Yellow Pencil Company sells the best pencils ever made. If the cost of producing x hundred pencils is given by C x x x ( ) 0.4 29 44 = − + 2 and if the revenue generated from the sale of x hundred pencils is R x x x ( ) 0.6 19 = − + 2 . Money is in thousands of...
*November 24, 2015*

**Algebra**

The distance traveled by an object moving in a straight line is given by s = t2 − 2t, where s is in feet and t is the time in seconds the object has been in motion. How long (to the nearest tenth) will it take the object to move 48 feet?
*November 24, 2015*

**Chemistry**

Why is Hydrogen sulfate amphiprotic?
*November 23, 2015*

**math**

write 2.18 as a mixed number in simplest form
*November 23, 2015*

**Pre-Algebra**

A ball is thrown straight up at 46 feet per second from about 6 feet above the ground. How long will it take for the ball to reach a height of 39 feet?
*November 22, 2015*

**Physics**

Using the data in the table below,determine how many calories are needed to change 100g of solid x at 10degrees celcious to a vapour at 210degrees celcious:thermodynamic constants for substance x: heat of fusion 40,0cal/g heat of vaporization 150,0cal/g melting point 10,0'...
*November 22, 2015*

**Philosophy**

In her book The Beauty Myth author Naomi Wolf argued that women harm themselves when they try to live up to the standards of beauty implied in most commercial advertising. The following excerpt is taken from a World Press Review commentary on Wolf’s work: [S]omething that...
*November 21, 2015*

**science**

A boy complains of stomach pain to his mother. Unable to resolve the issue herself, she takes the boy to the doctor. Which of the following might be a good hypothesis for the stomach pain?The boy fell and hurt his stomach. The boy has an infection and needs antibiotics. The ...
*November 20, 2015*

**functions **

Andrew is 5 years older than Tim. Tim is aged 19. Write an equation for x, where x is the age of Andrew. Solve the equation.
*November 20, 2015*

**Algebra 2**

How do I find z (or any other variable for that matter)? −2z + 6 + 2(z+1) = 14 −2z + 6 + 2z + 2 = 14 8 = 14 I try to solve the equation but end up with this, which is false.
*November 19, 2015*

**Algebra 2**

Solve by Substitution x + 2y + z = 14 y = z + 1 x = -3z + 6
*November 19, 2015*

**Chemistry**

What is the pH of a solution resulting from the addition of 10.0 mL of 0.17 M HCl to 50.0 mL of 0.16 M NH3? Assume the volumes are additive. Kb of NH3 = 1.8 ✕ 10-5.
*November 18, 2015*

**english**

Which revision changes a verb in the sentence to the subjunctive mood? Some colleges require that each potential student completes an essay.
*November 18, 2015*

**Math**

Show that the equation tanθ = sinθ can be written in the form sinθ(1 - 5cosθ) = 0?
*November 18, 2015*

**Physical science**

A train with a mass of 200,000 kg manages to brake to a speed of 3 m/sec before colliding with a truck with a mass of 2,000 kg that is stuck on the track. What speed does the truck move away from the train.
*November 18, 2015*

**EFA**

write a cubic equation whose integral coefficient roots are -5 and radical 2
*November 17, 2015*

**Algebra**

Divide and reduce to lowest terms wherever possible. 105/ 5+1/4
*November 15, 2015*

**Math homework**

1-(1/6)-(2/5) = (5/6)-(2/5) = ((25-12)/30) = 13/30
*November 12, 2015*

**Integral Calculus - Series**

Find if series is convergent or divergent. Series from n=2 to infinity (4n+7)/(3n^3 -8n)
*November 12, 2015*

**Math**

Thank you
*November 12, 2015*

**Math **

An airplane flys at a constant altitude of 2 miles and a constant speed of 600 miles per hour on a straight course that will take it directly over a kangaroo on the ground. How fast is the angle of elevation of the kangaroo's line of sight increasing when the distance ...
*November 12, 2015*

**math-linear algebra**

Determine which of the following mappings are linear mappings. A. The mapping L defined by L(x_1, x_2 ) = (4x_1- 2x_2, 3 |x_2|). B. The mapping L defined by L(x_1, x_2 ) = (2x_1-3x_2, x_1+4, 5x_2). C. The mapping L defined by L(x_1, x_2, x_3 ) =(x_1, 0 , x_3). D. The mapping L...
*November 11, 2015*

**math-linear algebra**

Determine the standard matrix A of the linear mapping L:R^2-->R^2 that rotates any vector through an angle of 150 degrees in the clockwise direction.
*November 11, 2015*

**math-linear algebra**

Determine the standard matrix D of the linear mapping G: R^2--R^2 that first rotates points clockwise through pi/6 radians and then reflects points through the line x_2=x_1
*November 11, 2015*

**Physics**

Air consists of molecules of several types, with an average molar mass of 28.95g. About how many molecules does an adult who inhales 0.50L of air at sea level take in? The answer should be 1.3x10^22
*November 11, 2015*

**math**

2x - 6 = 20. Add 6 to both sides. 20 + 6 = 26 26÷2 =13
*November 11, 2015*

**math**

[2(X+26)]/2=264/2 X+26=132 X+26-26=132-26 X=106
*November 11, 2015*

**physics**

A puck (mass m1 = 2.20 kg) slides on a frictionless table as shown in the figure below. The puck is tied to a string that runs through a hole in the table and is attached to a mass m2 = 6.6 kg. The mass m2 is initially at a height of h = 6.6 m above the floor with the puck ...
*November 10, 2015*

**physics**

A child of mass 52 kg jumps onto the edge of a merry-go-round of mass 170 kg and radius 1.9 m that is initially at rest as sketched in the figure below. While in the air (during her jump), the child's linear velocity in the direction tangent to the edge of the merry-go-...
*November 10, 2015*

**physics**

The drawing shows a skateboarder moving at 6.88 m/s along a horizontal section of a track that is slanted upward by 37.3 ° above the horizontal at its end, which is 0.741 m above the ground. When she leaves the track, she follows the characteristic path of projectile ...
*November 9, 2015*

**Organic Chemistry 2**

What is the impurity that must be removed from the benzaldehyde reagent before it can be used in this experiment? this is from are Benzil lab
*November 9, 2015*

**Organic Chemistry 2**

Compare the IR spectrum of benzoin ) with the IR spectrum of benzil . Explain how the changes in the important peaks are related to the differences between the two structures.
*November 9, 2015*

**math**

Every cereal box has a gift inside, but you cannot tell from the outside what the gift is. The store manager assures you that 16 of the 58 boxes on the shelf have the secret decoder ring. The other 42 boxes on the shelf have a different gift inside. If you randomly select two ...
*November 8, 2015*

**math**

In a family with 4 children what is the probability of having 1 boy and then 3 girls, in that order? (Exclude multiple births and assume all outcomes are equally likely). In a family with 4 children, what is the probability of having 1 boy and 3 girls, in any order? (Exclude ...
*November 8, 2015*

**math**

A hacker is trying to guess someone's password. The hacker knows (somehow) that the password is 14 characters long, and that each character is either a lowercase letter, (a, b, c, etc), an uppercase letter (A, B, C, etc) or a numerical digit (0, 1, 2, 3, 4, 5, 6, 7, 8, or ...
*November 8, 2015*

**math**

A hacker is trying to guess someone's password. The hacker knows (somehow) that the password is 14 characters long, and that each character is either a lowercase letter, (a, b, c, etc), an uppercase letter (A, B, C, etc) or a numerical digit (0, 1, 2, 3, 4, 5, 6, 7, 8, or ...
*November 8, 2015*

**math**

A couple plans to have three children. What is the probability that. a) they have all boys? b) they have at least one girl?
*November 8, 2015*