Sunday

March 1, 2015

March 1, 2015

Total # Posts: 78,300

**Math**

For an art exhibit, Craig has to choose 3 ceramic mugs out of the 7 that he made over the summer. In how many ways can he arrange these 3 mugs in a row? I'm not looking for the answer, but only an explanation for why this is a permutation problem and not a combination one.
*February 10, 2015*

**english**

Its A
*February 10, 2015*

**physics**

What is the mass of a man if he accelerates at 42 m/s/s and has a mass of 112 kg?
*February 10, 2015*

**chemistry**

I have 120 ml of a 2M NAOH solution. If Ionly use 10 ml the molarity of the 10 ml is stil 2M, correct?
*February 10, 2015*

**Anonymous**

input: 1 2 5 10 output: 7 11.5 25 47.5 What is a function rule?
*February 10, 2015*

**math**

Nicole is making a bowl of chex mix to serve to her guests .She has already put 45 cups of nuts,410 cups of raisins and 112 cups of chocolate chips in the bowl.If she wants to make 4 cups total ,how much chex cereal will she need to add?
*February 10, 2015*

**statistics**

The response to a question has three alternatives: A, B, and C. A sample of 120 responses provides 52 A, 29 B, and 39 C responses. Show the frequency and relative frequency distributions (use nearest whole number for the frequency column and 2 decimal for the relative ...
*February 10, 2015*

**Physics**

A coin rests on a record 0.15 m from its center. The record turns on a turntable that rotates at variable speed. The coefficient of static friction between the coin and the record is 0.30. What is the maximum coin speed at which it does not slip?
*February 10, 2015*

**chemistry**

Prove : Gr degree = 383 kj
*February 10, 2015*

**History**

What were three significant events related to ww1, I know there was the assassination but can someone help me find three to link to the main idea (WW1)
*February 10, 2015*

**chemistry**

How much work is done when 2.0 liters of CH4(g) undergoes combustion in excess oxygen at 0 degrees Celsius and 1.00 bar (assuming the volume of water formed is negligible)?
*February 9, 2015*

**University Physics II**

1. A voltage of 13 V is applied across the ends of a piece of copper wire 8 cm long. The mass of an electron is 9.11 × 10−31 kg and its charge is 1.6 × 10−19 C. What is the magnitude of the electron’s acceleration? Answer in units of m/s2. 2. After...
*February 9, 2015*

**Calculus**

Write the definite integral for the area of the region lying in the upper half of the ellipse given by 4x^2+y^2=4
*February 9, 2015*

**Calculus**

The rate of growth of a particular population is given by dP/dt=50t^2-100t^3/2 where P is the population size and t is the time in years. The initial population is 25,000. Find the population function. Estimate how many years it will take for the population to reach 50,000.
*February 9, 2015*

**Calculus**

An object has a constant acceleration of 72 feet per second squared, an initial velocity of 17 feet per second, and an initial position of 10 feet. Find the position function describing the motion of this object.
*February 9, 2015*

**Calculus**

Use a(t)=-32 ft/second squared as the acceleration due to gravity. A ball is thrown vertically upward from the ground with an initial velocity of 56 feet per second. For how many seconds will the ball be going upward?
*February 9, 2015*

**Calculus**

Use a(t)=-32 ft/second squared as the acceleration due to gravity. A ball is thrown vertically upward from the ground with an initial velocity of 96 feet per second. How high will it go?
*February 9, 2015*

**math**

Yuri has a rope 12 meters long. He cuts into pieces that are 2 meters long. What fraction of the rope is one piece?
*February 9, 2015*

**math**

Unroll has 6 yards of ribbon. She needs 1/5 to make 1bow. How many bows can she make? Explain how to write the equation an by using representation
*February 9, 2015*

**health**

1. Is Wrong(I just took the test) 2.Is right 3. Is not there
*February 9, 2015*

**health**

True or false the endocrine system only regulates long-term changes in the body True*** False Which endocrine glad(s) are responsible for the changes associated with puberty? A. thymus gland B. reproductive glands*** C. thyroid gland D. pancreas Please check
*February 9, 2015*

**math**

the grade of 8 students on a 10-point test were 1,3,5,5,7,8,9,10 comute the mean of these scores
*February 9, 2015*

**L.A**

Thank you
*February 9, 2015*

**L.A **

Which is the best phrase of these lines from "The New World"? eagles/hie and/hover/above/the plain A. Eagles hurry and hung above the flatland B.Eagles hang in midair and wave their wings C. Eagles race and rush in an ugly way D. Eagles soar and swoop in a simple, ...
*February 9, 2015*

**physics**

a basketball player tries to make a half court jumpshot releasing the ball at the height of the basket assuming the ball is lunch at 51 degrees 14 meters from the basket what velocity musta player give the ball
*February 9, 2015*

**physics**

a basketball player tries to make a half court jumpshot releasing the ball at the height of the basket assuming the ball is lunch at 51 degrees 14 meters from the basket what velocity musta player give the ball
*February 9, 2015*

**science**

the process in which an animal's cells use oxygen and digested food molecules to release the energy in food is called 1. breathing 2. cellular respiration 3. diffusion*** 4. gas exchange
*February 9, 2015*

**accounting**

What is the amount of the tax liability for a single person having taxable income of $59,200? All answers should be rounded to the nearest dollar.
*February 9, 2015*

**English**

What does the "larger dome" refer to in Today by Billy Collins? If ever there were a spring day so perfect, so uplifted by a warm intermittent breeze that it made you want to throw open all the windows in the house and unlatch the door to the canary's cage, ...
*February 9, 2015*

**Language Arts**

Poor restless dove, I pity thee; And when I hear thy plaintive moan, I mourn for thy captivity, And in thy woes forget mine own. To see thee stand prepared to fly, And flap those useless wings of thine, And gaze into the distant sky, Would melt a harder heart than mine. In ...
*February 9, 2015*

**Calc**

1.) Evaluate Lim x->0 (tanx/x) 2.) Find the equations of the lines that pass through the point (0,-2) and are tangent to the graph of y=x^2 3.) Find (d^2*y)/dx^2 and (dy/dx)^2, given that y=7x
*February 9, 2015*

**chemistry**

a 1.32g sample on unknown containing KHP as a component was titrated with 22.48mL of 0.105 M NaOH to a pheolphthalein end point. what is the weight percent of KHP in the unknown sample?
*February 9, 2015*

**enlish**

Africa is a huge continent with hundreds of different cultures. It's impossible to lump all "traditional African marriages" together!
*February 9, 2015*

**Social Studies**

C. d. b.
*February 9, 2015*

**Social Studies**

1.How does the amazon region best support the people of Brazil? a.by serving as a main artery of transportation b.by supplying fertile land for farming c.by providing forest rich with resources d.by protecting them from the encroachment of other people. 2.) The people of ...
*February 9, 2015*

**Math Probability Outcome **

A drawer contains 8 white socks and 5 black socks if two socks are chosen and you get 2 pair of white socks what is the probability outcome???
*February 9, 2015*

**Math Probability Outcome **

A drawer contains 8 white socks and 5 black socks if two socks are chosen and you get 2 pair of white socks what is the probability outcome???
*February 9, 2015*

**math **

Find two numbers (exactly) whose product is 10 and whose sum is 18.
*February 9, 2015*

**Calculus**

For midpoint rectangles my notes say something about expanding the interval but I'm not sure how that works.. And if it's minutes and hours would I have to do something to change it?
*February 8, 2015*

**Calculus**

I am in a car and travel for 12 minutes. Below are the speeds in mph, recorded every two minutes. Use trapezoids, right-bound rectangles, and midpoint rectangles to estimate the distance I traveled. Min 0 2 4 6 8 10 12 Speed 20 22 35 46 50 50 20 Trapezoids: Right-bound ...
*February 8, 2015*

**Physics Dynamics**

A 4-kg block is connected by means of a massless rope to a 2-kg block. What is the magnitude of the acceleration if the coefficient of kinetic friction between the 4-kg block and the surface is 0.20? Note : The 4kg block is on the table, the pulley is on the edge and the 2kg ...
*February 8, 2015*

**Physics Dynamics**

A 5.0-kg box is pulled horizontally with a 45-N force that makes angle of 40 degree with the horizontal. The coefficient of kinetic friction of the surface is 0.20. What is the magnitude of the acceleration of the box?
*February 8, 2015*

**Physics Dynamics**

A 10-kg block is pushed against a vertical wall by a horizontal force of 100 N. What is the coefficient of static friction between the block and the wall if the block is about to slide down?
*February 8, 2015*

**statistics**

a researcher weighs each individual in a sample of 25 laboratory rats and calculates the average weight for the group. the average weight is an example of a ____ .
*February 8, 2015*

**physics**

an arrangement of four disks are suspended by cords. The longer, top cord loops over a frictionless pulley and pulls with a force of magnitude 81.2 N on the wall to which it is attached. The tensions in the shorter cords are T1 = 62.7 N, T2 = 33.6 N, and T3 = 8.5 N. What are ...
*February 8, 2015*

**Math 1105**

if two identical squares have a total area of 18x^2+36x+18, find the length of one side of one of the squares
*February 8, 2015*

**physics**

A 0.60 kg object with an initial velocity of 3.0 m/s in the positive x direction is acted on by a force in the direction of motion. The force does +2.5 J of work. What is the final velocity of the object?
*February 8, 2015*

**Math**

A jet pilot is making a 1000 mile trip in her military Tomcat. She flies 800 mph for one hour and decides she wants to finish the trip so that she would have flown at an average of 1000 mph. How fast should she go to finish the trip and meet her goal?(Hint: Think carefully ...
*February 8, 2015*

**Math**

Find all pairs of integers whose difference is 5 and product is 234.
*February 8, 2015*

**Math**

The sum of two counting numbers is 243. Half of one number is four times the other number. What are the numbers? 121.1+122.2=243.2
*February 8, 2015*

**math**

A recipe for 1 batch of muffin included 2/3 cup of raisins. Ina made 2 1/2 batches of muffins. How many cups of raisin did she use. Is the answer 1 5/6
*February 8, 2015*

**finite math**

Recall from Example 1 that whenever Suzan sees a bag of marbles, she grabs a handful at random. She has seen a bag containing three red marbles, five green ones, four white ones, and three purple ones. She grabs eight of them. Find the probability of the following event, ...
*February 8, 2015*

**college algebra**

4rrr
*February 8, 2015*

**Physics **

A light string is attached to both a hanging mass m1 = 5 kg and to a pulley of mass m2= 6 kg, and radius R = 0.75 m. If the pulley is a solid disc rotating about its center with a moment of inertia of I = 0.5*m2R2, and the string does not slip on the pulley, (a) what is the ...
*February 8, 2015*

**physics**

In the lab, a relativistic proton has a momentum of 1.00 × 10-19 kg · m/s and a rest energy of 0.150 nJ. What is the speed of the proton in the lab? (c = 3.00 × 108 m/s, m proton = 1.67 × 10-27 kg): *
*February 8, 2015*

**Chemistry **

For a one step reaction, the activation energy for the forward reaction is 40.0 kJ mol-1, and the enthalpy of reaction is -20.0 kJ mol-1. Calculate the activation energy for the reverse reaction. Is my answer correct? (40 kJ mol-1)-(-20 kJ mol-1) = 20kJ mol-1
*February 8, 2015*

**PreCalculus **

Can someone help me answer this question, so I would know what to do for a question like this next time? Thank you! A box contains 10 red chips, 20 blue chips, and 30 green chips. If 5 chips are drawn from the box, find the probability of drawing a.) exactly 4 green b.) at ...
*February 7, 2015*

**physics**

The velocity-versus-time graph is shown for a particle moving along the x-axis. Its initial position is x0 = 1.8m at t0 =0s. Part A What is the particle's position at t=1.0s? Part B What is the particle's acceleration at t= 1.0s? Part C What is the particle's ...
*February 7, 2015*

**physics**

A 0.25 kg particle moves along an x axis according to x(t) = - 10 + 3 t + 2 t2 - 5 t3, with x in meters and t in seconds. In unit-vector notation, what is the net force acting on the particle at t = 3.6 s ? Give an expression for the (a) x, (b) y and (c) z components.
*February 7, 2015*

**Probability**

Can someone help me answer this question, so I would know what to do for a question like this next time? Thank you! A box contains 10 red chips, 20 blue chips, and 30 green chips. If 5 chips are drawn from the box, find the probability of drawing a.) exactly 4 green b.) at ...
*February 7, 2015*

**Probability**

Can someone please help me solve this problem? If the probability of a baseball player's getting it in one time at bat is 0.326, find the probability that the player gets no hits in 4 times at bat. Thank you!
*February 7, 2015*

**chemistry**

Benzoic acid reacts with water to form the benzoate ion by the following reaction C6H5COOH(aq) + H2O(l) ⇀↽ C6H5COO−(aq) + H3O +(aq) The equilibrium constant for this reaction is 6.4 x 10−5 . In a 0.1 M solution of benzoic acid, what is the concentration...
*February 7, 2015*

**chemistry**

A soluction of 100 mL of 0.2 M NH3 is titratedwith 50 mL of 0.5 M HNO3. What is the pH of the resulting solution? Kb for NH3 is 1.8 × 10−5 1. 5.30 2. 1.00 3. 1.48 4. 10.3
*February 7, 2015*

**chemistry**

Which of the following has the HIGHEST pKa? 1. HClO3 2. HBrO 3. HClO 4. HIO 5. HClO4
*February 7, 2015*

**chemistry**

What would be pH of a 0.01 M solution of a very expensive weak base, unobtainamine, whose pKb is 3.8? 1. 2.9 2. 14 3. 2 4. 7 5. 11.1
*February 7, 2015*

**chemistry**

Arrange the acids I) hydrogen selenate ion (HSeO− 4 ), pKa = 1.92; II) phosphorous acid (H3PO3), pKa1 = 2.00; III) phosphoric acid (H3PO4), pKa = 2.12; IV) selenous acid (H2SeO3), pKa = 2.46; in increasing order of strengths. 1. IV, III, II, I 2. II, IV, III, I 3. I, III...
*February 7, 2015*

**chemistry**

The term “Ka for the ammonium ion” describes the equilibrium constant for which of the following reactions? 1. NH3 + H2O ⇀↽ NH4 + + OH− 2. NH+ 4 + OH− ⇀↽ NH3 + H2O 3. NH3 + H3O + ⇀↽ NH+ 4 + H2O 4. NH+ 4 + H2O ⇀&#...
*February 7, 2015*

**chemistry**

Which of the following is the STRONGEST acid? 1. CH3COOH 2. CH3CH2OH 3. CHCl2COOH 4. CH2ClCOOH 5. CCl3COOH
*February 7, 2015*

**math**

You need to give 6mg of a drug, The drug on hand has a concentration of 24mg per ounce. How many teaspoons will you give?
*February 7, 2015*

**writting skills**

Once you acquire these two basic skills, you'll be able to transform a vague idea in your mind into a coherent piece of writing. A. Describing people and writing conversation B. Using the Internet and the on-line catalog C. Doing interviews and ...
*February 6, 2015*

**Math**

if z=3i and w=5i, then z<w. True or False?
*February 6, 2015*

**writting skills**

The World Almanac is a book of A. facts and statistics. B. living notable Americans. C. synonyms. D. articles published in magazines.
*February 6, 2015*

**Chemistry- Acid Base**

What is the conjugate acid of O2^-2
*February 6, 2015*

**math**

x2 + x − 42
*February 6, 2015*

**Chemistry**

Thank you anyways, I apologized for not giving enough information but I found that the answer is False.
*February 6, 2015*

**Chemistry**

After the volatile liquid has been added to the Erlenmeyer flask, the total pressure in the flask equals the vapor pressure of the volatile liquid. True or False?
*February 6, 2015*

**spinner**

packing a suitcase with 3 different color sweatshirts only have room for 2 sweatshirts in the suitcase how many different combinations of 2 sweatshirts could be pack
*February 6, 2015*

**chemistry**

a block of metal with dimensions of 5.6 cm and 11 cmm weights 5.55 kg.what is the density of the metal
*February 6, 2015*

**social studies**

what was one important political result of the Canadian constitution of 1982
*February 6, 2015*

**math**

How long will it take to earn $252 in interest if $1200 is invested at a 7% annual interest rate?
*February 6, 2015*

**math**

A man sold 3/5 of the goods at 20% loss, at what profit% should he sell remaining goods to get 10% profit on the whole?
*February 6, 2015*

**Crime and Society**

What do you think best explains high incarceration rates for Blacks compared to their percent of the general population.
*February 6, 2015*

**Crime and Society**

What explains the high incarceration rates for Black men?
*February 6, 2015*

**Crime and Society**

Is institutionalized racism to blame for these disparate rates?
*February 6, 2015*

**Crime and Society**

What explains high incarceration rates for Blacks on death row?
*February 6, 2015*

**English**

Reread lines 9-12 in “I Ask My Mother to Sing.” What idea is suggested by the image of the water lilies filling with water, spilling it into the lake, and filling it up again? Consider the event described in the final stanza. What are some ideas? I know it has ...
*February 6, 2015*

**math **

Place the numbers below on a number line: ∛7 , -3 , 0 , 105/59 , 7^1/3 , 7^2/3 I tries: ∛7 = 1.912 -3 0 105/59 = 1.779 7 1/3 = 7.33.. <-- right? 7 2/3 = 7.66.. <-- right? first of all ,does the answer i convert right?
*February 6, 2015*

**math**

Alyssa claims that dividing by 4/5 is the same thing as multipying by 5 then dividing by 4. Is she correct?explain why or why not
*February 5, 2015*

**Physics**

Determine the ratio of Earth's gravitational force exerted on an 80-kg person when at Earth's surface and when 1000km above Earth's surface. The radius of Earth is 6370 km. I have tried (6370)^2/(7370)^2 = 0.747 and it is wrong??
*February 5, 2015*

**geometry**

2. A person who is 1.5 meters tall casts a shadow that is 8 meters long. The distance along the ground from the person (N) to the flagpole (G) is 32 meters. Find the height of the flagpole (FG) showing all calculations.
*February 5, 2015*

**(REALLY NEED HELP )**

7x + 4
*February 5, 2015*

**math**

Alyssa claims that dividing by 4/5 is the same thing as multiplying by 5 then dividing by 4. Is she correct
*February 5, 2015*

**science**

m=0.0045kg E=3.6 J for .13m compression T=? Vm @ .05m from equilibrium= ? P.E.= .5KA^2 therefore find K=F/x (.0045x9.8)/(.13) K =.34N/m T=2pixsprt(m/K) T= 2xpi x sprt (.0045/.34) T= .72 secs B) E=PE+KE 3.6= .5 (3.4)(0)^2 + .2 (.0045)(v^2) v^2=1600 v=40
*February 5, 2015*

**English**

Describe the setting of “Grape Sherbet” as you visualize it. A graveyard with a family? Also, is the father dead or alive. I know this is happening on Memorial Day, but it doesn't seem clear whether the father is dead.
*February 5, 2015*

**Calculus**

Find the anti-derivative of the integral [3sqrt(x)(2x^2-4)]dx
*February 5, 2015*

**physics**

A person walks up a stalled 15 m long escalator in 110 s. When standing on the same escalator, now moving, the person is carried up in 70 s. How much time would it take that person to walk up the moving escalator?
*February 5, 2015*

**Calculus**

Find the anti-derivative of the integral (7tan^2x+12)dx
*February 5, 2015*

**Calculus**

Find the anti-derivative of the integral [(7t^2+6t-15)/t^4]dt
*February 5, 2015*

**Calculus**

Solve the differential equation f"(x)=x^2, f'(0)=3, f(0)=-1
*February 5, 2015*

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