Tuesday

August 4, 2015

August 4, 2015

Total # Posts: 1,092

**Chemistry**

If 30% of a sample of radioactive isotope decays in 24 hrs, what is the half-life? How do i know which order to use? and do I convert hr to mins or seconds? Pls help for my exam tomorrrow
*February 23, 2012*

**Statistics**

Find t-value for sample size n = 16 and area to the right 0.10
*February 22, 2012*

**statistics**

Sample with size n = 100 has mean = 30. Assuming the population standard deviation is 8, construct 95% confidence interval for population mean.
*February 22, 2012*

**statistics**

Sample with size n = 100 has mean = 30. Assuming the population standard deviation is 8, construct 95% confidence interval for population mean.
*February 22, 2012*

**Chemistry**

How do you calculate the mass in kilograms of 3.99 liters of acetic acid. The density of this substance is 1.05 g/mL.
*February 18, 2012*

**AlgebraII**

PLEASE HELP! I DO NOT KNOW WHAT TO DO? The maximum weight that a rectangular beam can support varies jointly as it's width and the square of its height and inversely as its length. If a beam 1/2 foot wide, 1/3 foot high, and 10 feet long can support 12 tons find how much a...
*February 18, 2012*

**consumer math **

Jim opened an account with $400. The account pays three percent quarterly. How much is in the account at the end of two years? Round to the nearest dollar. (Points : 1) 5. Use this table to answer questions 5 through 8. Principal Rate Compounded Time Final Amount $10,000 2% ...
*February 12, 2012*

**math**

Riverra owns a company that maker ceiling tiles. she chargers $6 per square foot. how much would it cost to put in ceiliing tiless to a room that measured 6 feet by 12 feet
*February 8, 2012*

**math**

simplify 8x-2y-x+5y
*February 6, 2012*

**statistics**

I am working on a problem in which you've helped someone else on a z-score percentile problem. I have my z-score and my number from the z-table. I'm trying to input it correct in spss but I'm not sure how to set it up. This is what I have so far... Question:What is...
*February 2, 2012*

**Contemporary Communication**

What makes a good person a communicator?
*January 30, 2012*

**Chem**

I really appreciate the help you gave me earlier. I was wondering if you could please look over these questions for me to? The answers will always be either reactant, product or neither. 1)P4(s)+6 Cl2(g)<=>4 PCl3(l) Which side of the reaction will be favoured by an ...
*January 29, 2012*

**Chem**

For number four the answer would be reactant? Correct?
*January 29, 2012*

**Chem**

I have 4 questions, I got the answer for three of them and just want you to check and see if they are right and i do not know the answer to the fourth one. 1)4HCl(g)+O2(g)<=>2H2O(g)+2Cl2(g)+114.4 kJ Which side of the reaction will be favoured by an decrease in pressure...
*January 29, 2012*

**Statistics**

Two fair six-sided dice are rolled and total of results on the top of each doe observed. Find the probability that total is 8
*January 28, 2012*

**statistics**

____o_____o_____ | _______o_______| | ____o_____o_____| Sorry. This is the correct picture
*January 27, 2012*

**statistics**

____o_____o_____ | | _______o________ | | ____o_____o_____ This is the correct picture
*January 27, 2012*

**statistics**

What is the probability that the following system works if each unit fails independently with probability p? ____o_____o_____ | | _______o________ | | ____o_____o_____ Note: In the above circuit "o" represents 5 relays in the circuit with propability p
*January 27, 2012*

**Social Studies**

What Is The New Jersey Plan
*January 22, 2012*

**Finance math**

If $100 is invested at 6% compunded A - annually B - quarterly C - monthly what is the amount after 4 years? How much interest is earned?
*January 21, 2012*

**Literature**

Assuming “Kubla Khan” is a deliberate fragment (i.e. that it is finished in its unfinished state), what does the introductory narrative imply about the nature of (ideal) poetic creation? How does the narrative frame our understanding of what the poem fragment is or ...
*January 15, 2012*

**PHI 103**

appeal to pity
*December 15, 2011*

**math**

how do you figure 4 1/2 to 1 3/10 ration as a fraction in lowest terms?
*December 15, 2011*

**Algebra 1**

using point slope formula how do you graph y-2=-3(xt2)
*December 12, 2011*

**calculus**

A rectangle is inscribed in an isosceles triangle. If the sides of the triangle are 10, 10 and 12, what are the dimensions of the rectangle having the greatest area? The diagram shows the triangle on a set of axes with base 12 on the x axis and the top vertices on the y axis.
*December 11, 2011*

**stat**

Assume that the population of heights of female college students is approximately normally distributed with mean m of 67.26 inches and standard deviation s of 5.96 inches. A random sample of 78 heights is obtained. Show all work. (A) Find (B) Find the mean and standard error ...
*December 10, 2011*

**English**

to announce a message
*December 7, 2011*

**geometry**

Find the measure of the vertex angle of an isosceles triangle if either of the exterior angles formed by extending the base measures of 112
*December 1, 2011*

**statistics**

Find the value of z such that approximately 20.88% of the distribution lies between it and the mean.
*November 30, 2011*

**statistics**

What is the probability that a student in a college of 650 students in both a math major and a computer science major ( assuming these events are independent) If there are 72 math majors and 105 computer science majors?
*November 30, 2011*

**spanish**

How do I use the cue to write sentence with the ver gustar for: Roberto/los libros de misterio/no
*November 30, 2011*

**Algebra**

Sue can shovel snow from her driveway in 45 minutes. Jim can do the same job in 55 minutes. How long would it take them if they worked together?
*November 27, 2011*

**Chemistry**

Kp = Kc (RT) (exponent = (2+1)-2) 0.700 = Kc (R * 319) not sure what R is or how to figure it out????
*November 27, 2011*

**Chemistry**

At 319K the decomposition of dinitrogen tetroxide occurs with the following Kp: 2NO2(g)<>2NO(g)+O2(g) Kp=.700 What is the value of Kc for this reaction?
*November 27, 2011*

**statistics**

If the random variable z is the standard normal score and a > 0, is it true that P(z > -a) = P(z < a)? Why or why not?
*November 26, 2011*

**statistics**

Find the (two) z-scores that bound the middle 40% of the standard normal distribution. please show the work.
*November 26, 2011*

**Ethical Decision Making Case Study**

Paula realizes that the medical record she is reviewing belongs to Bob, her best friend's fiance Paula learns that Bob has HIV. Paula knows her friend does not know of Bob's condition. What can Paula do without violating HIPPA?
*November 26, 2011*

**stats**

In testing a new drug, researchers found that 1% of all patients using it will have a mild side effect. A random sample of 12 patients using the drug is selected. Find the probability that: (A) exactly one will have this mild side effect (B) at least one will have this mild ...
*November 23, 2011*

**psy.**

Intimacy
*November 21, 2011*

**precalculus**

solve the inequality and write the answer using interval notation 50/(x+4)+1<4x
*November 12, 2011*

**english**

Zora's lemon tree produces to mush fruit. she gives them away, therefore to her friends and neighbors.
*November 12, 2011*

**precalculus**

solve the equation in the complex number system x^4+x^3+4x^2+10x-60=0
*November 12, 2011*

**precalculus**

solve the equation in the complex number system x^4+x^3+4x^2+10x-60=0
*November 12, 2011*

**precalculus**

Solve the logarithmic equation. Express your solutions in exact form only. 18e^-x -e^x=7
*November 11, 2011*

**precal**

Find the components and so that fog =H . H(x)=log_3e^x
*November 9, 2011*

**statistics**

Can any sample proportion less than 0.5 be used to support a claim that the population proportion is greater than 0.5?
*November 9, 2011*

**math**

f a stone is tossed from the top of a 330 meter building, the height of the stone as a function of time is given by h(t) = -9.8t2 – 10t + 330, where t is in seconds, and height is in meters. After how many seconds will the stone hit the ground? Round to the nearest ...
*November 9, 2011*

**precalculus**

find the component f and g so that fog =H H(x)=log3 e^x
*November 8, 2011*

**recalus**

find the component f and d , so that fog =H H(x)=log-3 e^x
*November 8, 2011*

**college math**

1500.00
*November 7, 2011*

**chem**

Im not sure how to go about this: Calculate the number of gramms in 0.65 mole of aluminum carbonate?
*November 4, 2011*

**Physics**

Your teacher tosses a basketball. The ball gets through the hoop (lucky shot). Height of hoop= 3.048m height of person= 2.342 m the ball is thrown at 17 m/s at an angle of 46 degress Part 1: How long does it take the ball to reach its max height? Part 2: How long does it take ...
*November 2, 2011*

**Physics**

To win the game, a place kicker must kick a football from a point 20 m (21.872 yd) from the goal, amd the ball must clear the crossbar, which is 3.05 m high, When kicked, the ball leaves the ground with a speed of 16 m/s at an angle of 58.1 degrees from the horizontal. The ...
*November 2, 2011*

**algebra**

PLEASE HELP ME FIND x/-3 = 3/-2 Thanks!
*October 31, 2011*

**Chemistry 105**

How many mL of O2 will form from 55.2g KClO3?
*October 22, 2011*

**Math**

If you had a fraction strip folded into twelfths, what fractional lengths could you measure with the strip? b. How is your answer in part (a) related to the factors of 12?
*October 20, 2011*

**Math**

7x+6=9x 6=2x x=3 Sam made 7x which is 21 Wilbur made 9x which is 27
*October 18, 2011*

**Intermediate Algerbra**

x=5
*October 18, 2011*

**math 10**

(2^2)^3 you would multiply the exponents so that 2^6 which is 64
*October 18, 2011*

**Intermediate Algebra**

f(0)=-10 y-intercept is (0,-10) f(x)=0=5x-10 10=5x x=2 x-intercept is (2,0)
*October 18, 2011*

**Calculus**

find the limit as x approaches zero of (3sin2x)/sin7x and show work
*October 18, 2011*

**Algebra 1**

first put it in slope intercept form 5x+6y=-12 6y=-5x-12 y=(-5/6)x-2 so: f(x)=(-5/6)x-2
*October 18, 2011*

**Algebra 1**

just change y to f(x) y=2x f(x)=2x
*October 18, 2011*

**Physics**

You buy a plastic dart gun, and being a clever physics student you decide to do a quick calculation to find its maximum horizontal range. You shoot the gun straight up, and it takes 3.8 s for the dart to land back at the barrel. What is the maximum horizontal range of your gun?
*October 17, 2011*

**Physics**

An Olympic long jumper is capable of jumping 8.3 m. Assume that his horizontal speed is 9.5 m/s as he leaves the ground. He was in the air for .87 seconds. How high does he go assuming that he lands upright, the same way he was when he left the ground?
*October 17, 2011*

**Physics**

At what projection angle will the range of a projectile equal to 5 times its maximum height?
*October 16, 2011*

**MBA Practice problems**

you are presently involved with a project to establish the cost of the gold presently used in the production of 1000 computer chips per month. each chip uses two grams of 20 ct gold with the remaining portion of a metal whose cost is insignificant. what is the monthly cost of ...
*October 14, 2011*

**physics**

A ball thrown horizontally at 22.3 m/s from the roof of a building lands 31.0 m from the base of the building. How high is the building?
*October 13, 2011*

**physics**

Two boxes of masses 21.6 kg and 28.2 kg sit on a smooth, frictionless surface. The boxes are in contact, and a horizontal force of 68.2 pushes horizontally against the smaller box. What is the acceleration of the two boxes?
*October 13, 2011*

**Physics**

A tether ball of mass 0.25 kg is attached to a vertical pole by a cord 1.4 m long. Assume the cord attaches to the center of the ball. The cord makes an angle of 20° with the vertical. (a) What is the tension in the cord? (b) What is the speed of the ball?
*October 12, 2011*

**Astronomy/Physics**

I cannot calculate the gravitational force between these two objects. I am confused. Jupiter (R=800 million km, M = 2 x 10 to the 27th power kg and a 100 kg person on earth. Please help!
*October 12, 2011*

**physics**

calculate horizontal force that must be applied to 1kg to make 6ounce to make it accelerat on horizontal friction three hour table dropped with same acceleration it would have if it and feel freely
*October 11, 2011*

**Statisics**

35%of adult Americans are regular voters. A random sample of 250 adults in a medium-size college town were surveyed, and it was found that 110 were regular voters. Estimate the true proportion of regular voters with 90% confidence and comment on your results... Can you show ...
*October 5, 2011*

**Physics**

is force and normal force the same thing? if not what is the difference. for instancee if a problem said given a force of 20 newtons. would normal force be 20 newtons? please answer !!!!!!!!!
*October 5, 2011*

**statistics**

A random sample of state gasoline taxes in cents is shown here for 12 states. Use the data to estimate the true population mean gasoline tax with 90% confidence. Does you interval contain the national average of 44.7 cents? 38.4 40.9 67 32.5 51.5 43.4 38 43.4 50.7 35.4 39.3 41.4
*October 5, 2011*

**English (Urgent)**

I think it sounds great...:))) Keep up the good work!!
*October 5, 2011*

**Physics**

what equation would I use to find the magnitude of the mass's velocity?
*October 5, 2011*

**Physics**

how do you find the magnitude of the mass's velocity?
*October 5, 2011*

**Physics**

A mass of 18 kg is being pushed up a frictionless incline with a constant force of 20 Newtons directed parallel to the incline, up the incline. At the top of the incline the mass is moving at 23 m/s up the incline. If the angle of inclination is 58 degrees and the height (not ...
*October 5, 2011*

**calculus**

Find constants a and b in the function f(x)=ax^b/(ln(x)) such that f(19)=1 and the function has a local minimum at x=19. What is a and b?
*October 5, 2011*

**Physics**

A mass of 11 kg is placed on a frictionless incline which is inclined at an angle of 69 degrees above the horizontal. It is held in place by a rope which is attached to a wall at the top of the incline. The rope is angled 13 degrees above the direction parallel to the incline...
*October 5, 2011*

**Physics**

A mass of 8 kg lies on a horizontal, frictionless floor. A force of 72 Newtons pushes to the left (negative x direction) with a force of 72 Newtons. Another force of unknown magnitude pushes the mass in a direction of 21.4 degrees above the positive x axis. The mass is ...
*October 5, 2011*

**Physics**

A mass of 5.6 kg lies at the top of a frictionless incline. It is inclined at an angle such that the normal force on the mass is 30 Newtons. If the length of the incline is 58 meters and the mass is originally at rest at the top of the incline and then released, how long does ...
*October 5, 2011*

**Physics**

A mass of 5.6 kg lies at the top of a frictionless incline. It is inclined at an angle such that the normal force on the mass is 30 Newtons. If the length of the incline is 58 meters and the mass is originally at rest at the top of the incline and then released, how long does ...
*October 5, 2011*

**Physics**

A mass of 18 kg is being pushed up a frictionless incline with a constant force of 20 Newtons directed parallel to the incline, up the incline. At the top of the incline the mass is moving at 23 m/s up the incline. If the angle of inclination is 58 degrees and the height (not ...
*October 5, 2011*

**Physics**

A mass of 5.6 kg lies at the top of a frictionless incline. It is inclined at an angle such that the normal force on the mass is 30 Newtons. If the length of the incline is 58 meters and the mass is originally at rest at the top of the incline and then released, how long does ...
*October 4, 2011*

**Physics**

A mass of 18 kg is being pushed up a frictionless incline with a constant force of 20 Newtons directed parallel to the incline, up the incline. At the top of the incline the mass is moving at 23 m/s up the incline. If the angle of inclination is 58 degrees and the height (not ...
*October 4, 2011*

**algebra**

The length of a rectangle is 3x + 4/4x^2-4 and and the width is8x − 8/6 the area of the rectangle is a)1 b)2 c)x+1/x-1 d)4 please help!
*October 2, 2011*

**Physics 1**

A mass of 18 kg is being pushed up a frictionless incline with a constant force of 20 Newtons directed parallel to the incline, up the incline. At the top of the incline the mass is moving at 23 m/s up the incline. If the angle of inclination is 58 degrees and the height (not ...
*October 1, 2011*

**us history **

why dont more textbooks have readings on blacks resisting slavery?
*September 18, 2011*

**science**

A race car travels northward on a straight, level track at a constant speed travels 0.756 km in 18.0 s. The return trip over the same track is made in 23.0 s
*September 18, 2011*

**history **

why did the europeans say the indians were uncivilized ?
*September 18, 2011*

**chemistry**

A doctor has ordered that a patient be given 11 of glucose, which is available in a concentration of 60.00 glucose/1000.0 of solution. What volume of solution should be given to the patient?
*September 18, 2011*

**math**

use the digits 0,2,4,6,8 exactly once to form a 3-digit and 2-digit NEGATIVE intfer that will give you the LEAST possible sum when the two intergers are added together.
*September 17, 2011*

**geometry**

Point M is the midpoint of line JK. If JM is 6x-7 and MK is 2x+3 what is JK?
*September 14, 2011*

**AP Chemistry**

A 21.0054 g sample of impure magnesium carbonate was heated to complete decomposition according to the equation MgCO3(s) → MgO(s) + CO2(g) . After the reaction was complete, the solid residue (consisting of MgO and the original impurities) had a mass of 19.0732 g. ...
*September 13, 2011*

**AP Chemistry**

In the reaction below, 23 g of H2S with excess O2 produced 9 g of sulfur. ? H2S + ? O2 → ? S + ? H2O . What is the percent yield of sulfur? Answer in units of %
*September 13, 2011*

**AP Chemistry**

For the reaction ? Al + ? CuSO4 ↽⇀? Al2(SO4)3+? Cu a maximum of how many moles of Al2(SO4)3 could be formed from 5.49 mol of Al and 4.09 mol of CuSO4? Answer in units of mol
*September 13, 2011*

**Chemistry**

Not sure of my answers, pls help me out. I have to indicate the kinds of intermolecular forces that occur between the solute and the solvent in which the molecule is most soluble. a) glucose b) naphthalene c) dimethyl ether d) alanine (an amino acid)
*September 9, 2011*