# Posts by marc

Total # Posts: 178

**Statistics**

The annual precipitation for one city is normally distributed with a mean of 72 inches and a standard deviation of 3.5 inches. In 95% of the years, the precipitation in this city is between___ and ___

*July 23, 2012*

**chemistry**

simply put, (0.75 C/s)(time)(1 mole e-/96485 C)(1 mole Cu/2 mole e-) = (0.10825-0.04175) time = 17,110.07 s = 4.7527 hr

*June 18, 2012*

**chemistry**

my answer is 4.7527 hr. it is solved by this format: time = [(0.10825-0.04175)/((0.75)(1/96485)(1/2))]/[3600] time = 4.7527 hr Note: for the dimensional analysis, (mol)/(C/s)(mol/C)=s (divide by 3600 to convert to 1 hr) hope it helps.

*June 18, 2012*

**english**

. Your topic is courtesy, and you're writing from the point of view of a caring mentor. Which of the following sentences is most persuasive for an audience of high school graduates from a working-class neighborhood? A. Courtesy to others shows self-respect as much as it ...

*May 10, 2012*

**physics**

I meant 3.86*10^-6 N

*April 28, 2012*

**physics**

A mass of 710 kg is located at the origin. A second mass, 44.0 kg, is located at the point (0.216,0.702) m. Find the magnitude of the gravitational force on the 44.0 kg mass due to the 710 kg mass at the origin. I got: 3.86×10-6 N Enter the x and y components of the ...

*April 28, 2012*

**physics**

Please decide which of the following statements for car collisions are true or false. 1)Crumple zones on cars are parts of the front of the car that are designed to receive maximum deformation during a head-on collision. The essential safety benefit of crumple zones results ...

*April 11, 2012*

**physics**

A bullet of mass m = 5.89 g is fired into a block of mass M = 3.09 kg that is initially at rest on the edge of a smooth table. (The table top is 0.83 m above the floor.) The bullet ends up stuck in the block, and together they fly off the table and fall to the floor. If the ...

*April 8, 2012*

**running.from.myself**

#3 --> 16, because you can rotate it by rotations of multiples of 60, in addition, you could also flip the snowflake along the axes of rotational symmetry #4 --> 12, same reasoning as before

*February 26, 2012*

**Physics**

Wheel A of radius ra = 13.9 cm is coupled by belt B to wheel C of radius rc = 34.3 cm. Wheel A increases its angular speed from rest at time t = 0 s at a uniform rate of 5.7 rad/s2. At what time will wheel C reach a rotational speed of 168.2 rev/min, assuming the belt does not...

*February 10, 2012*

**Physics?**

ok..so for c: v = w*r = 168.2*0.343m =57.6926 and therefore for a: w = v/r = 57.6926/0.139m = 415.055 is that correct? and for the acceleration: for a: a= 5.7*0.139 = 0.7923 and for c: 0.7923/0.343 = 2.3099 but how do I get time ??

*February 10, 2012*

**Physics**

Wheel A of radius ra = 13.9 cm is coupled by belt B to wheel C of radius rc = 34.3 cm. Wheel A increases its angular speed from rest at time t = 0 s at a uniform rate of 5.7 rad/s2. At what time will wheel C reach a rotational speed of 168.2 rev/min, assuming the belt does not...

*February 10, 2012*

**math**

i do not get this question 24 / x = 4

*February 2, 2012*

**English 7 - Journal Entry Check**

instead of "in" use on for this sentence

*February 2, 2012*

**English 7 - Journal Entry Check**

between hard and i for this sentence"I worked really hard. I was" should be a comma also with this sentence"A few weeks later the" a comma should be between later and the

*February 2, 2012*

**physics**

A 0.58 kg football is thrown with a velocity of 15 m/s to the right. A stationary receiver catches the ball and brings it to rest in 0.017 s. What is the force exerted on the receiver? Answer in units of N

*January 30, 2012*

**statistics**

Among the four northwestern states, Washington has 51% of the total population, Oregon has 30%, Idaho has 11%, and Montana has 8%. A market researcher selects a sample of 1000 subjects, with 450 in Washington, 340 in Oregon, 150 in Idaho, and 60 in Montana. At the 0.05 ...

*December 2, 2011*

**PSYCHOLOGY HELP PLEASE!!**

The answer is (D), "We have met them on previous occasions."

*December 1, 2011*

**Math**

Samantha saved $13 by buying a used DVD. She paid $5 less than half the original price of a new one. How much did Samantha pay for a used DVD?

*November 15, 2011*

**macroeconomics**

27. The following data show nominal GDP and the appropriate price index for several years. Compute real GDP for each year and indicate whether you have “inflated” or “deflated” nominal GDP in finding real GDP. All GDP are in billions. Nominal Price level ...

*October 11, 2011*

**macroeconomics**

25. The following table shows the price of a specific stereo receiver for a five-year period. Using Year 1 as the base year, calculate the price index for each year. Year Price Price index (answers using Year 1 = 100) 1 $112 ___ 2 144 ___ 3 160 ___ 4 176 ___ 5 200 ___

*October 11, 2011*

**macroeconomics**

23. The next four questions refer to the following price and output data over a five-year period for an economy that produces only one good. Assume that year 2 is the base year. Units of Price Year output per unit 1 16 $2 2 20 3 3 30 4 4 36 5 5 40 6 (a) If year 2 is the base ...

*October 11, 2011*

**macroeconomics**

22. The following table shows the price of a specific stereo receiver for a five-year period. Using year 3 as the base year, calculate the price index for each year. Year Price Price index 1 $ 88 ___ 2 $100 ___ 3 $120 ___ 4 $132 ___ 5 $140 ___

*October 11, 2011*

**macroeconomics**

18. The following is a list of figures for a given year in billions of dollars. Using this data, compute: (a) GDP; (b) NDP; (c) NI; (d) PI; (e) DI; (f) Net exports. Transfer payments $ 16 Government purchases 80 Personal taxes 38 Corporate income taxes 28 Indirect business ...

*October 11, 2011*

**physics**

one of the factors that limits the reach of a crane is the moment created by the load, measured with the respect to an axis A at the base of the front support. if the boom shown is 30m long, and at an angle of 25 degrees with the horizontal, determine the moment of the 20000 ...

*September 13, 2011*

**physics**

A person is to run a circular track with a radius of 93 meters. The person starts at a certain spot and runs 3 and 1/2 times around the track in a time of 227 seconds. Find the magnitude of average velocity for this trip (|vav|) and find the average speed for this trip. Then ...

*September 3, 2011*

**Math**

You times each number by .25.. 2 Quarts? 2 x 0.25 Why 0.25? 1/4 = 0.25

*August 29, 2011*

**calculus**

At noon, ship A starts sailing due east at the rate of 20km/hr. Ath the time, ship B, which is located 100km east of ship A initially, starts sailing on a course 60 degrees north of west at the rate of 10km/hr. How fast is the distance between the two ships changing one hour ...

*March 24, 2011*

**economics**

in vietnam, a paddy of rice is transplanted using 20 workers with wicker backets, in south korea a paddy of rice is transplanted using one worker and a mechanical rice transplanter. using a isoquant-isocost line graph, illustrate why these two different methods are used for ...

*February 28, 2011*

**english**

1. The giant monster attacked the warehouse, yesterday morning the warehouse was making sneakers.

*February 20, 2011*

**calculus**

which of the following is an equation of the line tangent to the graph of y = (x^3)-x at the point where x =2: a) y - 6 = 4(x-2) b) y - 6 = 5(x-2) c) y - 6 = 6(x-2) d) y - 6 = 11(x-2) e) y - 6 = 12(x-2) thanks!

*December 14, 2010*

**Calculus**

which of the following is an equation of the line tangent to the graph of y = (x^3)-x at the point where x =2: a) y - 6 = 4(x-2) b) y - 6 = 5(x-2) c) y - 6 = 6(x-2) d) y - 6 = 11(x-2) e) y - 6 = 12(x-2) thanks!

*December 14, 2010*

**Calculus**

if x^2 + y^3 = (x^3)(y^2) then dy/dx = ? thanks

*December 11, 2010*

**Calculus**

a spherical ballon is being inflated at a constant rate of 25 cm^3/sec. At what rate in cm/sec is the radius of the ballon changing when the radius of the ballon is 2 cm? (VOLUME SPHERE FORMULA 4/3 pi r^3)

*November 26, 2010*

**calculus**

a rectangle with one side on the x axis and one side on the line x=2 has it upper left vertex on the graph of y=x^2, for what values of x does the area of the rectangle attain its maximum value?

*November 26, 2010*

**Calculus**

a college is planning to construct a new parking lot. the parking lot must be rectangular and enclose 6000 square meters of land. A fence will surround the parking lot, and another fence parallel to one of the sides will divide the parking lot into two sections, what are the ...

*November 26, 2010*

**physics**

a 27,000kb freight train starting at 12m/s then speeds up to 45 m/s in 35 seconds. what is the acceleration?

*November 11, 2010*

**Spanish**

thanks!

*August 22, 2010*

**Spanish**

What are subjunctive verbs in Spanish? I've learned them before but I don't understand them.

*August 22, 2010*

**10th grade algebra 2**

The Third Root of 3 = 3^1/3 The square root of nine= 3^2 3^1/3 x 3^2= 3^2 1/3

*June 4, 2010*

**statistics**

Use the given information to find the P-value. Also, use a 0.05 significance level and state the conclusion about the null hypothesis (reject the null hypothesis or fail to reject the null hypothesis). 1) Vvith H1: p * 0.733, the test statistic is z = 2.09. A) 0.0183; fail to ...

*April 21, 2010*

**chem**

K thanks

*April 8, 2010*

**chem**

Thanks! And can you calculate the percent yield if they don't give the actual yield?

*April 8, 2010*

**chem**

A metal oxide reacts with water to produce a metal hydroxide. What additional information would you need to determine the percent yield of metal hydroxide from this reaction?

*April 8, 2010*

**math**

A prescription calls for the 4% Pilocar with a Sig. of "gtt i OU tid". How many 15-ml bottles should be dispensed for a 90 days supply if the eye drop bottle delivers 20 drops per ml? Somehow, it is a bit confusing. I tried: 1 bottle/ml soln * ml soln/20 drops * 3 ...

*February 15, 2010*

**math**

FYI You can check the final answer like so: 59 + 74 + 74/3 You should get an answer of 69! Voila!

*February 15, 2010*

**math**

Set the problem like this: 59 + x + x / 3 (because it's total 3 tests)) Set the above equal to 69 (your desired result) SO: 2x + 59 = 207 (which is 69 * 3) 2x = 207 - 59 2x = 148 x = 74 She used to scores of 74 to get a mean of 69. Hope this helps!

*February 15, 2010*

**Managerial Accounting**

The company reported a 6% operating margin on sales, a 12% pretax operating return on total assets, and $500 million of average total assets. I have calculated the operating income to $60,000,000. How do I calculate the total sales and total asset turn over?

*January 30, 2010*

**algebra**

Find the greatest common factor of 6a 3 b 2 c 10 + 20c 10 – 8a 3 b 2 c 9

*January 27, 2010*

**math**

how do I solve 1/3 x = 5/12

*January 24, 2010*

**kindergarten math**

what does this mean draw a piece of yarn 3 counters long?

*January 20, 2010*

**algebra**

A 3-mi cab ride costs $3.00. A 6-mi cab ride costs $4.80. Find a linear equation that models cost c as a function of distance d. write your linear equation using function notation.

*January 13, 2010*

**math**

I need to make up ten numbers that are divisible by 2,3,4,5,6,8,and 10.

*October 19, 2009*

**psy 220**

describe a situation that might be viewed diffently by two people. this event can be as small as an encounter on the street or as major as the birth of a child

*August 2, 2009*

**Chemistry**

so if the equation I'm using is 3CuSO4+2AL(NO3)3 arrow 3CU(NO3)2+Al2(SO4)3 how many moles of CuSO4 would be needed to produce 8 moles of Al2(SO4)3? Would the answer be 8?

*April 21, 2009*

**english**

on which line is there a spelling mistake. 1/ reported to the HSE or local authority immediately. A major injury is 2/ construction industry. About one hundred and forty are fatal. This is 3/ hospital treatment lasting more than twenty-four hours.

*December 9, 2008*

**math**

b+9=8+7 is the answer b=6 since 8+7=15

*November 17, 2008*

**math**

Not sure. example she gave was n-2=4+2 the answer is n=8 but i have to write it out on how i got the answer i have to check my answer

*November 17, 2008*

**math**

how about b+9=8+7 would it be b=6 since 8+7=15

*November 17, 2008*

**math**

i am in 3rd grade and we are learning about equations. I was not in class when she went over the steps. I need help. y+3=6X2

*November 17, 2008*

**Chemistry**

ITS THE ZUMDHAL BOOK!

*July 21, 2008*

**english**

can someone help me write a bibliography for my report? what is the format for writing a bibliography?

*May 21, 2008*

**science**

A tick that feeds on the blood of animals is a - a. parasite b. host c. predator d. competitor ???help please?

*May 14, 2008*

**physics**

A lamp is moved from 26 cm to 90 cm above the pages of a book. Compare the illumination on the book before and after the lamp is move.

*May 12, 2008*

**physics**

actually for the second part, it wouldn't be a cylinder but a sphere. thus beta = 2/5. the velocity equation in this case would be V = sqrt[(2gH)/(1+beta)]

*April 6, 2008*

**science**

how many bones are there in the human skeletal

*February 27, 2008*

**chemistry**

Hexane is a hydrocarbon (a molecule containing only carbon and hydrogen) with a molecular weight of 86.18 g/mol, a density of 0.660 g/mL, and a boiling point of 69C . Pentanol is an alcohol (a hydrocarbon with a "OH" group attached to one of its carbons) with a ...

*February 4, 2008*

**chemistry**

Hexane is a hydrocarbon (a molecule containing only carbon and hydrogen) with a molecular weight of 86.18 g/mol, a density of 0.660 g/mL, and a boiling point of 69C . Pentanol is an alcohol (a hydrocarbon with a "OH" group attached to one of its carbons) with a ...

*February 4, 2008*

**math**

I need to make up ten numbers that are divisible by 2,3,4,5,6,8,9,10. Please help.

*January 17, 2008*

**FRACTIONS**

IF 20 COUNTERS ARE A WHOLE SET, WHAT FRACTION OF THE SET IS 16 COUNTERS?

*December 10, 2007*

**science**

A 52.0 kg male dancer leaps 0.37 m high. (a) With what momentum does he reach the ground? (c) As the dancer lands, his knees bend, lengthening the stopping time to 0.050 s. Find the average force exerted on the dancer's body. (d) Compare the stopping force with his weight...

*December 9, 2007*

**math**

13-b/6=2-0.5b/4 I cross muliptiled and I got 12-3b=52-4b. I'm stuck. What do I do now?

*November 1, 2007*

**Math**

Find all positive integers a<b<c (a is less than or equal to b, b is less than or equal to c) such that: arctan (1/a) + arctan (1/b) + arctan (1/c) = (pi/4)

*October 6, 2007*

**Literature**

Has anyone read the Strange Case of Dr Jekyll and Mr Hyde and/or The Time machine ?? if so,please let me know..as i have some questions thank you

*September 16, 2007*

**lattice math**

Why should we estimate before solving a problem? We should estimate before solving a problem to make sure our answer is close to the real answer. Here's a simple problem. Suppose we want to find wnat a 6% tax on a $10 purchase would be. When you do the math, the answer ...

*October 3, 2006*

**Physics**

9.9 = v^2/r 9.9 * 100 = v^2 v = 99.5 m/s Time for revolution = 2 pi r/v = 2 pi * 100/99.5 = 6.31 seconds = .105 minutes 1/.105 = 9.5 revs/minute

*September 18, 2006*