Sunday

January 22, 2017
Total # Posts: 1,716

**statistics**

IQ is normally distributed with a mean of 100 and a standard deviation of 15. Suppose one individual is randomly chosen. Let X = IQ of an individual. The middle 30% of IQs fall between what two values?

*June 15, 2011*

**physics**

A golfer takes three putts to get her ball into the hole once she is on the green. Her first putt displaces the ball 71.0 ft north; the second, 6.0 ft, 45 degrees south of east; and the third, 3.0 ft, 45 degrees south of west. What is the magnitude of the displacement (in feet...

*June 14, 2011*

**pre calculous**

solve each equation algebraically and check it by substituing into the orignall equation. 50e^0.035x=200 3LN(x-3)+4=5 Method of your choice by solving. logx^2=6 Logx^4=2 2x-2^-x/2=4 e^x+e^-x/2=4 500/1+25e^.3x=200

*June 12, 2011*

**History**

Well this site is no help. Thanks, found a better one!

*June 11, 2011*

**History**

What do you think is the most significant thing to learn about the differences between social, political and economic systems in the world?

*June 11, 2011*

**8th grade math**

A 20 ounce bag of popcorn costs $2.80 at the movie theater, if the unit price remains the same, how much would a 35 ounce bag cost ? Please help me, I'm in math class and Im stuck.

*June 10, 2011*

**Statistics**

Employees in a large computer firm claim that the mean salary of the firm’s programmers is less than that of its competitors. The competitor’s salary is $47,000. A random sample of 30 of the firm’s programmers has a mean salary of $46,500 with a standard ...

*June 7, 2011*

**maths**

simn spent 2/5 of his pocket money on a computer game he spent 25% of his money on a ticket for a football match what is the fraction of his pocket money that he had left

*June 5, 2011*

**geometry**

given that a/b=c/d, decide whether it is true or not that a/c=b/d.

*May 26, 2011*

**Math**

log2(x)- log2(7) does this equal 1?

*May 24, 2011*

**pre-calculus**

what is the F-^1 of 6/x+4

*May 22, 2011*

**Chemistry**

oh my work wasn't entered correctly. the 0.5 M, 2nd +s, and 0.5+s should be under Ba+

*May 14, 2011*

**Chemistry**

How many grams of BaCO3 will dissolve in 3.0 L of water containing a Ba+2 concentration of 0.5 M (Ksp= 5.1E-9) My work: BaCO3 <-> Ba+ + CO3- i 0.5 M c -s +s +s e 0.5 +s +s (s)(0.5+s)= 5.1E-9 s= 1.0E-9mol/L x 3.0 L x 197.336 g/L= 5.92E-6 grams of BaCO3 dissolved ^Is this ...

*May 14, 2011*

**Physics**

Two students are on a balcony 19.6 m above the street. One student throws a ball (ball 1) vertically downward at 15.8 m/s; at the same instant, the other student throws a ball (ball 2) vertically upward at the same speed. The second ball just misses the balcony on the way down...

*May 13, 2011*

**Chemistry**

How do I take into account the change in volume?

*May 11, 2011*

**Chemistry**

Calculate the pH of the 0.20 M NH3/0.20 M NH4Cl buffer. What is the pH of the buffer after the addition of 10.0 mL of 0.10 M HCl to 65.0 mL of the buffer?

*May 11, 2011*

**biology**

Discuss possible benefits and drawbacks of a transgenic organism such as Bt corn?

*May 11, 2011*

**chemistry**

In the chemical equation wA+ xB-> yC+zD, a comparison of the number of moles of A to the number of moles of C would be a?

*May 9, 2011*

**Math**

A pond 100 ft in diameter is surrounded by a circular grass walk 2 feet wide. Find the are of the walk. Answer in terms of π. Please help me! TY

*May 6, 2011*

**Earth Science**

Which of the following layers of the atmosphere is closest to the ground?

*May 5, 2011*

**earth**

Atmosphere Homework! 1.Which of the following layers of the atmosphere is closest to space? 2.A barometer measures? 3. The atmosphere contains tiny solid particles called what? 4.The process by which the atmosphere slows Earth's loss of heat to space is called the ..? 5....

*May 5, 2011*

**2nd Grade Math**

Jordan spent $6.37 on a book and $1.23 on a magazine. How much did he spend all together? First estimate the costs and the totals. _____+______=______ Then use partial sums and solve. _____

*May 4, 2011*

**algebra help**

(-2,2) (4,20) Find the value of x when y is 9.

*May 4, 2011*

**accouting**

Company E December 31, 2010 Assets $42,000 $32,760 $26,880 $74,760 $114,660 Liabilities 34,440 22,932 14,515 51,584 ? December 31, 2011 Assets 45,000 32,400 ? 81,900 124,200 Liabilities ? 22,032 14,773 39,312 98,118 During year 2011 Stock issuances 6,000 1,400 9,750 ? 6,500 ...

*May 2, 2011*

**chemistry**

in the chemical equation :2C2H6+7O2->4CO2+6H2O, hOW many moles of c2h6 will you need to form 2.34 mol of co2? How many moles of water will be produced?

*April 28, 2011*

**HSM 220 Week 6 Budget Matrix**

I am having some help with this assignment. I have filled it in with what I think is correct but am not positive with my answers. Can someone please help me? The assignment is due tomorrow (4-21-11) Budget Matrix You are the executive director of a local government workforce ...

*April 20, 2011*

**math**

How do you find one fourth or two thirds?

*April 18, 2011*

**English**

Write a story using the words alcove, bigoted, clandestinely, corrugated, futile, inexorably, plausible, ramification, sanguine, and scrutinized. It can be any version of the word and they can be in any order.

*April 15, 2011*

**Chemistry**

In one trial of an investigation 50.0 mL of HCl(aq) of an unknown concentration is Tiresias with 0.10M NaOH (aq). During the titration the total volume of NaOH (aq) added and corresponding pH value of the reaction mixture are measured and recorded in the table below: 10mL-1....

*April 14, 2011*

**Chemistry**

What is the percent yield of a reaction in which 240. g phosphorus trichloride reacts with excess water to form 142 g HCl and aqueous phosphorus acid?

*April 13, 2011*

**Math**

okay that's what i wasn't sure of thanks

*April 13, 2011*

**Math**

write the equation in slope intercept form 6x+3y=12 i got y=2x+4 but i don't think i am right please HELP!!!

*April 13, 2011*

**Math**

OHHHH now i see thanks

*April 13, 2011*

**statistics**

what number is 16 percent of the variable y

*April 10, 2011*

**physics**

A trapdoor on a stage has a mass of 20.8 kg and a width of 1.51 m (hinge side to handle side). The door can be treated as having uniform thickness and density. A small handle on the door is 1.41 m away from the hinge side. A rope is tied to the handle and used to raise the ...

*April 10, 2011*

**physics**

In preparation for a demonstration on conservation of energy, a professor attaches a 8.7-kg bowling ball to a 3.2-m-long rope. He pulls the ball 18° away from the vertical and holds the ball while he discusses the physics principles involved. Assume that the force he ...

*April 10, 2011*

**Physics URGENT!!!!**

1.A 75 kg passenger in a van is wearing a seat belt whent he van moving at 15m/s, collides with a conrete wall. The front end of the van collapses 0.50 m as it comes to rest. a) what was the paseenger's kinetic energy before the crash b) What average force did the seat ...

*April 9, 2011*

**Physics: energy**

The spiral shaft in a grain auger raises grain from a farmers truck into a storage bin. Assume that the auger does 6.2 x 10*5 J of work on a certain amount of grain to raise it 4.2 m from the truck to the top of the bin.What is the total mass of the grain moved?

*April 9, 2011*

**Physics**

A boy on a bucycle drags a wagon full of newspapers at 0.80m/s for 30 minutes using a force of 40N. How much work has the boy done?

*April 8, 2011*

**calculus**

find the derivative f(x)= 8ln(x^5-2x)

*April 7, 2011*

**calculus**

suppose a price-demand function p(x) is defined implicitly by x= p^3-3p^2+200 find p'.

*April 7, 2011*

**8th grade math**

The Exotic Pets Club has 23 members, all of whom have a snake, an iguana, or a tarantual. Four members have all three kinds of pets. Ten members have a snake, 14 have iguanas, and 13 have tarantulas. Two have a snake and an iguana, three have an iguana and a tarantula, and one...

*April 7, 2011*

**chemistry**

Write the overall ionic equation and the net ionic equation for the reaction between BaCl2 and Na2SO4 in aqueous solution, indentify the spectator ion and the precipitate ion for this reaction. help :(

*April 6, 2011*

**Chemistry**

Write the equation for the dissolution of (NH4)2S04 in water. How many moles of each type of ion, and how many total moles of ions does the dissolution of 0.5 mol of (NH4)2S04 produce? help pleaseeeeee ASAP

*April 6, 2011*

**Math**

Let R be the plane region bounded by x=1, x=5, the x-axis and y=1/x. Approximate the are of R using 8 right rectangles.

*April 5, 2011*

**Physics**

62.5

*April 5, 2011*

**Trig**

What is the exact value of sin^-1(sin(8pi/15)?

*March 30, 2011*

**Science**

How many times a year does the moon go through its cycle or phases?

*March 28, 2011*

**english**

what other ideas does Tom Corbett have in place to save money in PA?

*March 28, 2011*

**science**

How many times a year does the moon go through its cycle or phases?

*March 28, 2011*

**physics**

A bar made of a particular metallic alloy has a length of 10 cm at a temperature of 24 oC and a length of 10.015 cm at the boiling point of water. (a) If a second bar made of the same material were 10 m at 24 oC, how much longer would this bar be at the boiling point of water...

*March 27, 2011*

**english**

so they agree with the plan because it will provide money for rebuilding prisons

*March 22, 2011*

**english**

How does the GOP feel about Tom Corbett decision to cut education funding for schools in Pennsylvania?

*March 22, 2011*

**psychology 101**

Kohlberg’s 6 stages of moral development 1. Punishment and Obedience 2. Mutual Benefit 3. Interpersonal Expectations 4. Law and Order 5. Legal Principles 6. Universal Moral Principles Based on a individuals reason to follow moral decisions Piaget’s theory of moral ...

*March 21, 2011*

**psychology 101**

what are the difference between one another

*March 21, 2011*

**psychology 101**

List and compare Kohlberg’s 6 stages of moral development and Piaget’s theory of moral development.

*March 21, 2011*

**math**

24.94189, 24.94199, 24.9419, 24.942

*March 21, 2011*

**physics**

note, it's supposed to be 1 atm=10^5 Pa

*March 20, 2011*

**physics**

An rectangular above-ground swimming pool is 9 m long and 4 m wide. The pool wall has a constant height of 3 m above the ground. Take atmospheric pressure to be 1 atm = 105 Pa and g = 10 m/s2. (a) Calculate the weight of the air that fills the pool when the pool is empty. (...

*March 20, 2011*

**Math Trig**

Find all solutions on the interval [0,2pi] for the following: 2sin^2(x)-5sin(x)=-3 cos^2(x)+sin(x)=1

*March 14, 2011*

**Trig**

How do you find the solutions?

*March 14, 2011*

**Trig**

no it's 2cosx-sqrt3=0

*March 14, 2011*

**Trig**

Finding all Solutions for 2cos(x)-ã3=0

*March 14, 2011*

**Trig**

sin^2x/sec^2x-1

*March 14, 2011*

**Math**

Find the exact value of Sin^-1(sin(13pi/15))

*March 14, 2011*

**AP Spanish**

Compare and contrast The Rising by Bruce Springsteen and Thursday from La Oreja de VanGogh.? I know the songs are about the September 11 tragedy in the U.S and the March 11 tragedy in Spain. Include comments and views of the role of each song.

*March 13, 2011*

**Physics**

Can you please show me how these answers are reached. A fully loaded Cessna-182 airplane of mass 1290 kg has an engine failure when flying with an airspeed of 139 km/h at an altitude of 2670m on a calm day. It then glides at a constant glide angle (which is the direction of ...

*March 11, 2011*

**geometry**

Could we multiply the following dimensions 9yards x 6 yards x 3 yards and then convert the final answer into cubic feet?

*March 10, 2011*

**geometry**

if I had a prism with the dimensions of 9 yards x 6 yards x 3 yards what is the deminsion in cubic feet?

*March 9, 2011*

**physics**

An airplane is flying horizontally with a speed of 1000 km/hr (278 m/s) when it drops a payload. The payload hits the ground 37 s later. (Neglect air drag and the curvature of the Earth. Take g = 10 m/s2.) (a) At what altitude H is the airplane flying?

*March 4, 2011*

**physics**

Calculate the value of g for a satellite that is orbiting in a circle at an altitude equal to 3 Earth radii. also, along the same lines, A typical shuttle altitude is 220 km. Calculate the value of g at this altitude. The the mass of the Earth = 5.98 x 10^24 kg and the radius ...

*March 3, 2011*

**calculus**

find all horizontal and vertical asymptotes of f(x)=2x^2+7x+12/2x^2+5x-12

*March 3, 2011*

**physics**

ok, i tried that and it's still giving me the wrong answer. On one of the hints it says path/time. I'm so lost, haha

*March 3, 2011*

**physics**

If the rotational speed of each wheel is 9 revolution per second, what are the tangential speeds of a point on the rim of each wheel? Note: Wheels spin independently with equal rotation speeds -Diameter of Wheel A: 24 -Diameter of Wheel B: 12

*March 3, 2011*

**physics**

If the rotational speed of each wheel is 9 revolution per second, what are the tangential speeds of a point on the rim of each wheel? Note: Wheels spin independently with equal rotation speeds -Diameter of Wheel A: 24 -Diameter of Wheel B: 12

*March 2, 2011*

**calculus**

A company manufacturing surfboards has fixed costs of $300 per day and total costs of $5100 per day for a daily output of 20 boards. Assume the total cost per day C(x) is linearly related to the total output per day x. Write an equation for the cost function, and write an ...

*February 28, 2011*

**calculus**

Find all horizontal and vertical asymptotes of f(x)= 2x^2 + 7x + 12/ 2x^2 + 5x - 12

*February 28, 2011*

**calculus**

x^6<16x^4

*February 28, 2011*

**Mathematics**

Please help, I need this ASAP.

*February 27, 2011*

**Mathematics**

Which set of ordered pairs are on the graph of the function y = 1/2 x - 2 ? F (-4,0) , (6,-5 ) G (-4,0) , (6, 5 ) H (4,0) , (6,-5 ) J (4,0) , (6, 5 ) Help ? Please.

*February 27, 2011*

**Mathematics**

Thanks so much ! Helper and Ms.Sue :]

*February 27, 2011*

**Chemistry**

What? If anything, is wrong with the following sets of quantum numbers. a. n = 2, l = 2, ml = 0, ms = +1/2 b. n = 0, l = 0, ml = 0, ms = -1/2 c. n = 3, l = 2, ml = -2, ms = +1/2 d. n = 4, l = 2, ml = 2, ms = -1/2

*February 27, 2011*

**physics**

A jet flying at 132 m/s banks to make a horizontal circular turn. The radius of the turn is 3810 m, and the mass of the jet is 1.68 × 105 kg. Calculate the magnitude of the necessary lifting force.

*February 24, 2011*

**third grade hw help**

Hello All, Please help my son with his Math fraction. He needs to put the below fractions in ordedr from least to greatest. 1) 2/4, 2/3, 2/7, 2/5 2) 1/2, 6/7, 5/7, 1/10 3) 1/2, 6/7, 1/12, 2/3, 11/12, 1/6, 1/3, 1/4, 4/5 Please help!!! Thanks.

*February 24, 2011*

**3rd grade math hw help!**

Hell All, Please help my son with his Math fraction. He needs to put the below fractions in ordedr from least to greatest. 1) 2/4, 2/3, 2/7, 2/5 2) 1/2, 6/7, 5/7, 1/10 3) 1/2, 6/7, 1/12, 2/3, 11/12, 1/6, 1/3, 1/4, 4/5 Please help!!! Thanks.

*February 24, 2011*

**calculus**

The fee per ton of pollution is given by A(x) = F(x)=x. Write a piecewise de nition of A(x). What is the limit of A(x) as x approaches 4,000 tons? As x approaches 8,000 tons?

*February 24, 2011*

**calculus**

Given f(x) = x^3, evaluate lim h-->o f(a+h)-f(a)/h

*February 24, 2011*

**Science**

What happens first in a lunar eclipse?

*February 23, 2011*

**physics**

A loop of wire is lying flat on a tabletop. A uniform magnetic field is directed vertically UPWARDS such that it is perpendicular to the tabletop (and the loop). Beyond the edge of the table, the magnetic field is zero. Imagine that you are looking DOWN on the loop from above...

*February 22, 2011*

**physics**

A loop of wire is lying flat on a tabletop. A uniform magnetic field is directed vertically UPWARDS such that it is perpendicular to the tabletop (and the loop). Beyond the edge of the table, the magnetic field is zero. Imagine that you are looking DOWN on the loop from above...

*February 22, 2011*

**physics**

A loop of wire is lying flat on a tabletop. A uniform magnetic field is directed vertically UPWARDS such that it is perpendicular to the tabletop (and the loop). Beyond the edge of the table, the magnetic field is zero. Imagine that you are looking DOWN on the loop from above...

*February 22, 2011*

**physics**

A loop of wire is lying flat on a tabletop. A uniform magnetic field is directed vertically UPWARDS such that it is perpendicular to the tabletop (and the loop). Beyond the edge of the table, the magnetic field is zero. Imagine that you are looking DOWN on the loop from above...

*February 22, 2011*

**physics**

A loop of wire is lying flat on a tabletop. A uniform magnetic field is directed vertically UPWARDS such that it is perpendicular to the tabletop (and the loop). Beyond the edge of the table, the magnetic field is zero. Imagine that you are looking DOWN on the loop from above...

*February 22, 2011*

**Physics**

A person on top of a wall of height 3.4 m stands near the edge, leans over and tosses a putty wad of mass 1.3 kg vertically into the air as shown in the figure below. The wad reaches a maximum of 4 m above the top of the wall. The wad then comes down and hits the ground near ...

*February 20, 2011*

**English**

In the sentence "The Komodo's teeh are dangerous to everyone." Is the prepostional phrase to everyone which describes dangerous making in an adverb? Thanks!

*February 20, 2011*

**English**

IN the sentence "The ora does not interest poachers around the island" Is the prepositional phrase around the island and does it describe poachers which makes it an adjective?

*February 20, 2011*

**maths**

123 feet

*February 18, 2011*

**reading**

reading i think?

*February 17, 2011*

**Please help me**

what are parts of a poem?

*February 17, 2011*