# Posts by David

Total # Posts: 2,325

**Chemistry**

in 25grams of aluminium oxide reacts with 50grams aquoues hyrdogen chloride what is the mass of aluminum chloride produced?

**6th Grade Math**

Thanks!!!

**6th Grade Math**

Estimate a range for each sum. 3.89 + 42.71 + 12.32 I don't understand what to do for "estimating a range".

**earth science**

what are the landscape regions that the hudson river flows through

**chemistry**

how do you balance the equation __Al+__CuO=>__Al2O3+__Cu

**Business**

Mr Jones intends to retire in 20 years at the age of 65. As yet he has not provided for retirement income, and he wants to set up a periodic savings plan to do this. If he makes equal annual payments into savings account that pays 4% interest per year, how large must his ...

**ELLS**

Do you know anything about English Language Learners?

**6th grade Math**

thanks!

**6th grade Math**

The gas tank of your parents car holds 12.9 gallons of gas. Because their car averages 27.8 miles per gallon, how many times will they have to fillup the gas tank to drive to cincinnati and back? From Detroit, Michigan to Cincinnati, Ohio = 264.1 miles.

**Calculus**

a) prove that the function x^3 + 9x^2 +33x assumes the value -8 at least once b)using the mean value theorom or rolle's theorom - no other methods will be accepted - prove carefully that x^3 + 9x^2 + 33x takes on the value -8 at most once

**Math -- 6th Grade**

Thank you drwls!

**Math -- 6th Grade**

The sum of two decimal numbers is 5.3. Their difference is 1.7, and their product is 6.3. What are the two numbers? Does the product have anything to do with getting the answers?

**6th grade Math**

Thank you Bob!

**8th grade math**

55 mhp to 70 mhp

**physics**

CBA

**Economics**

U.S. antitrust enforcement policies have focused on 1) Enforcing market codes of ethics 2) Preventing "golden parachutes" 3) preventing price fixing arrangements 4) forcing firms to produce output at the point where P=MC 5) breaking up any firm with more than 10 ...

**comm arts**

when do you use homophone besides or except? Ican attend the meeting if it is scheduled any day of the week ..... Friday. What shoul I use. except or besides? Thanks

**Algebra**

trnslate to na algebraic expression a number divided by 15

**math**

solv the inequality: 1. 7-3x [is less than or equal to] 22 ---> x [is greater than or equal to] -5 2. 4x-2/3 [is greater than or equal to] 1/3 ---> x [is greater than or equal to] 3/5 are these correct??

**chemistry**

Q1) 5 liters of Butane gas (C4H10) is reacted with plenty of oxygen at 27 oC and 1 atm to produce carbon dioxide and water vapor. Calculate the following: 1- The volume of CO2 produced at 1 atm and 400 oC. 2- The mass of H2O vapor produced. 3- The mol % of the products. Given...

**9th grade**

@bobpursley so you mean we have to do a factor tree for 1000 numbers?!

**math**

Find an angle between 0 and 2Ð that is coterminal with given angle. 1. -7Ð /3 2. 10 3. 51Ð /2

**math**

Find an angle between 0 degree and 360 degree that is coterminal with given angle. a. 361 degree b. -100 degree c. 1270 degree

**council**

what is a good speech of secretary and vice presidents: this is what secretary it does attend council meetings take pictures at school functions distribute and collect surveys at school funtions and from classrooms participate in council activities vice president attend ...

**math**

27 / (5+4) * 19 = 27 / (9) * 19=3*19=57. Mom is right.

**math**

it is: -y/x* (2x+y)/(2y+x) let me now if you need more details.

**Social Studies**

thank you!

**Social Studies**

Yes. Can anyone help me?!?!?!?!? Help!!!!!!!!!!!!!!

**Social Studies**

I did but i can not find anything.

**Social Studies**

I need help finding a current event. The topic is A Famous Person Who Has Done Some Type Of Charitable thing. The article can be anywhere from last thursday to today. Thank You!

**math115**

The electricity costs of a buisness increased from $15,000 in one year to $16,000 the next. To the nearest whole percent what was the rate of increase?=7% Write the following as a common fraction or mixed number write in lowest terms 5.035 = 5 7/200

**math115**

thank you

**math115**

Let me try it this way I am dividing 30/49 by 16/21 or 30/49 dividing by 16/21= 45/56

**math115**

divide 30/49 divide 16/21= 45/56 a triangle has a base 15ft and an altitude of 8ft find the area =60ft^2

**Physics**

You are correct. I had the EXACT same Physics problem and got them correct.

**Math**

find mean, median and is mean or median more useful representation 25,29,30,30,30,31,33,34,40,41,46,63 mean 36 median 32 more useful 32

**Math**

find median 4,5,6,8,11,17 answer 7 find mean and median 68,69,71,75,76,76,81,82,86,88,93,94,95,95,96 answer mean is 83 median is 82 ?

**Math**

evaluate |-24|-|-22| answer -2? -|-618|answer -618 3-|7-9|answer 5? ?

**Math**

determine max and min value 3,- 36/7,-1,-2/3,5/4,-5,26/9 answer max3 min-5 ? put in asending order -2/9,-1/9,3/7,5/9,1/8

**Math**

add -4/5+{-3/4} simple form 1 1/5

**math**

Two circles of radius 4 are tangent to the graph y^2=4x at the point (1,2). Find the equations of the two circles.

**math**

Find (f + g)x, (f-g)x, (fg)x, and (f/g)x and their domains. f(x)=¡î(9-x©÷),g(x)=¡î(x©÷-4)

**math**

Find (f + g)x, (f-g)x, (fg)x, and (f/g)x and their domains. f(x) = ¡î(9-x©÷), g(x) = ¡î(x©÷-4)

**Math**

How much space (in ft³ ) will be taken up by the 458 balloons.

**Math**

Height: The volume of a cone is 100 in³. Find a function that models the height h of the cone in terms of its radius r.

**Math**

Minimizing Sum: Find two positive numbers whose sum is 100 and the sum of whose squares is a minimum.

**Math**

Maximizing Area: Among all rectangles that have a perimeter of 20 ft, find the dimensions of the one with the largest area.

**math**

Height: The volume of a cone is 100 in^3. Find a function that models the height h of the cone in terms of its radius r.

**math**

A woman 5 ft tall is standing near a street lamp that is 12 ft tall. Find a function that models the length L of her shadow in terms of her distance d from the base of the lamp.

**geometry**

Find a function that models the area A of a circle in terms of its circumference C.

**math**

A young man spent 1/4 of his allowance on a movie. He spent 11/18 of the remainder on after-school snacks. Then from the money remaining, he spent $3.00 on a magazine, which left him 1/24 of his original allowance to put into savings. how much of his allowance did he save?

**math**

If you place one full container of flour on one pan of a balance scale and similar container 3/4 full and a 1/3-pound weight on the other pan, the pans balance. How much does the full container of flour weight?

**math**

An airline passenger feel asleep halfway to her destination. When she awoke, the distance remaining was half the distance traveled while she slept. How much of the entire trip was she asleep?

**math**

60 guest were present at dinner. Is this correct?

**math**

how many guests were present at a dinner if every two guest shared a bowl of rice, every three guests shared a bowl of broth, every four guests shared a bowl of fow, and 65 bowls were used together.

**5th grade**

I am a 3-digit number.My first digit is a square number.My last digit is 3* my second digit,which is my half my first digit.What am I.

**physics**

Calculate the terminal speed of a wooden sphere(density 0.830g/m^3) falling throught air if its radius is 8.00cm and its drag coefficient is 0.500? From what height would a freely falling object reach this speed in the absence of air resistance?

**accounting 201**

I am sorry I am tired and meant to write professional fees.

**accounting 201**

Oops I said I could not figure out capital, it was processional fees that I meant to list. Capital is clearly 30,000.

**accounting 201**

I am having trouble figuring out my accounts payable and capital. Any help on going about and solving this would be greatly appreciated. I have listed the data below... Travis Fortney, an architect, opened an office on April 1, 2010. During the month, he completed the ...

**Science**

A 6.0 volt battery is hooked up to a light bulb, whose resistance is 3.1 ohms. How many electrons would leave the battery per second? (Hint: 1 electron = 1.6E-19 C)

**physics**

After falling from rest at a height of 29.2 m, a 0.488 kg ball rebounds upward, reaching a height of 20.3 m. If the contact between ball and ground lasted 1.68 ms, what average force was exerted on the ball? I'm so confused on where to start. tyvm

**5th grade**

4+9,6+7,8+5

**SOCIAL STUDIES**

HOW DID THE ICE AGES INFLUENCE HUMAN MIGRATION

**Elasticity (Physics)**

A tunnel of length L=150m, height H=7.2m, and width w=5.8m (with a flat roof) is to be constructed at a distance d=60m beneath the ground. The tunnel roof is be entirely supported by square steel columns, each with a cross sectional area of 960 cm^2. The mass of 1.0 cm^3 of ...

**4th grade**

G d h fr hhj

**physics**

vcfcffgygyy

**Chemistry**

if pressure on a 2.50 ml gas sample were doubled from 0.500atm to 1.00 atm what would be gas volume at the new pressure?

**Statistics**

A study has shown that the thickness of sheet steel follows an approximately uniform distribution from 20 to 50mm. What is the probability that a sheet of steel chosen at random will be between 20 and 30mm?

**Math**

Thanks so much I understand now

**Economics**

Suppose that the governmental authorities wished to decrease use of a pesticide that is leaching into groundwater supplies in a watershed by 60% from current use levels. Discuss the advantages and/or disadvantages of distributing marketable pesticide permits to each farm ...

**8th grade**

i need help 4 a test on everything inequalities

**math**

Why is math so hard?

**math**

let the width be x and the length be y we know xy = 6 and x^2 + y^2 = (2ã5)^2 = 20 Perimeter = 2(x+y) from algebra we know (x+y)^2 = x^ + 2xy + y^2 but we know the values on the right side, so (x+y)^2 = 20 +12=32 then x+y = ã32 and the perimeter is 2...

**English**

This question is based on the book "The Curious Incident of the Dog in the Night-time" by Mark Haddon. What do you think makes a hero? How does Christoper fit your idea of a hero? He has been described by some readers as "a new kind of hero" or "an ...

**Finance**

. Mr. Kane recently borrowed $15,000 from his Aunt Jemima, and he has promised to pay his aunt $5,000 per year at 15%. How long will it take Mr. Kane to pay off the entire loan from his aunt? 2. You just borrowed $1,000 from Mr. Loan Shark. Mr. Shark requires you to pay $150 ...

**Finance**

1. Mr. Kane recently borrowed $15,000 from his Aunt Jemima, and he has promised to pay his aunt $5,000 per year at 15%. How long will it take Mr. Kane to pay off the entire loan from his aunt? 2. You just borrowed $1,000 from Mr. Loan Shark. Mr. Shark requires you to pay $150 ...

**CHEMISTRY**

a. ) The bond length is the internuclear distance. b. ) The covalent bond is a region of high electron charge density between two atoms. c. ) Hybrid orbitals are combinations of atomic orbitals. d. ) There are the same number of hybrid orbitals produced as the number of atomic...

**CHEMISTRY**

Which statement about structure and bonding is INCORRECT? a. ) The bond length is the internuclear distance. b. ) The covalent bond is a region of high electron charge density between two atoms. c. ) Hybrid orbitals are combination of atomic orbitals. d. ) There are the same ...

**Chemistry**

First, start with a balanced equation. Then, use stoichiometry to determine the limiting reactant and then how much product (AgCl) is produced. Use this (theoretical yield) and the actual yield (33.6g) to determine the percent yield.

**Chemistry**

For mole composition, you would convert each to moles and then determine the percent of each to the total.

**Finance**

Given the following information: profit margin = 10%; sales = $100; retention ratio = 40%; assets = $200; equity multiplier = 2.0. If the firm maintains a constant debt-equity ratio and no new equity is used, what is the maximum growth rate? (Assume a constant profit margin.)

**Finance**

Moore Money Inc. has a profit margin of 11% and a retention ratio of 70%. Last year, the firm had sales of $500 and total assets of $1,000. What is the internal growth rate?

**International Business**

1. Construct a quantitative example to illustrate the principle of comparative advantage. 2.What are dynamic effects of free trade and why might they be important?

**International Business**

What are the current challenges facing the World Trade Organization (WTO)?

**math**

I would say that the rate is 12.5%. btw, this task is just nonsense

**math**

divide 36x^8-24x^6+20x^3/-4x^3

**Physics**

An ice skater, has a rotational inertia of I = 4 kg m2, and spins at 2 rad/sec. She then changes her rotational inertia to 2 kg m2. What is her final angular velocity? a. 4 rad/s b. 2 rad/s c. 2.8 rad/s d. 8 rad/s The answer must be A then right.

**Physics**

An ice skater, hasa rotational inertia of I = 4 kg m2, and spins at 2 rad/sec. Her rotational inertia then undergoes a change to 2 kg m2. Which of the following is true? a. Her angular momentum remains the same b. Her angular velocity increases c. Her kinetic energy increases ...

**Physics**

so its A then right

**Physics**

An ice skater, has a rotational inertia of I = 4 kg m2, and spins at 2 rad/sec. She then changes her rotational inertia to 2 kg m2. What is her final angular velocity? a. 4 rad/s b. 2 rad/s c. 2.8 rad/s d. 8 rad/s I say B, am i right?

**Physics**

There is a net net torque that is applied to a rigid object. What happens? a. the angular momentum of the object will change b. the kinetic energy of the object will change c. the object will experience an angular acceleration d. the rotational inertia of the object will ...

**Physics**

The Angular momentum of an object that spins is determined by a. the rotational speed b. the mass of the object c. the choice of the axis of rotation d. all of the above I say d based on the fact that momentum =r*p where p is mv and r takes into account the axis

**Physics**

A diver jumps off a dving board and does a twisting manuever. In the midst of his jump in the air, the diver cannot change his a. Rotational Energy b. Rotational Speed c. Rotational Inertia d. Angular momentum I say d just want to make sure

**Physics**

A wheel spins on a horizontal axis, with an angular spped of 140rad/s and with its angular velocity pointing east. Determine the magnitude of the angular velocity after an angular acceleration of 35 rad/s^2, pointing 68 degress west of north, with a time of 4.6 seconds. I ...

**Physics**

A wheel spins on a horizontal axis, with an angular spped of 140rad/s and with its angular velocity pointing east. Determine the magnitude of the angular velocity after an angular acceleration of 35 rad/s^2, pointing 68 degress west of north, with a time of 4.6 seconds. I ...

**Inorganic chemistry**

Complete and balance the reaction, Mno4-(aq) + C2O4- = MnO2(s) + Co3^2-(aq)

**Chemistry**

IN my experiment, I was doing a qualitative analysis of Group I and II anions using a flowchart. IN the chart I added 5 drops of 0.1M AgNO3 and several drops of 3M HNO3 to 5 drops of solution and found that a precipitate was formed. Thus it was classified as a Group I anion. ...

**Chemistry**

The experiment that I did in lab consisted of performing a qualitative analysis of group 1 and 2 cations and anions. The first thing that I did was to add 5 drops of 3M HCl, centrifuge it, and to observe whether a precipitate would form. It did and in the flowchart it ...

**chemistry**

What would be the advantages and disadvantages of using tribasic sodium phosphate (aka trisodium phosphate) to soften water by removing calcium ions?