Sunday

September 21, 2014

September 21, 2014

Total # Posts: 127

**Physics**

A rock is dropped into a deep hole and 2.2 s later the sound of striking the bottom is heard. If the speed of sound is 340 m/s, what is the depth of the hole?
*September 5, 2014*

**Science**

how is energy produced during a nuclear fusion reaction?
*June 1, 2014*

**Maths**

Factorise to quadratics X^2+5x-14 X^2-x-90 X^2-13x+40
*November 18, 2013*

**Maths**

Ummm I actually do noe but I just wanted to make sure. Plus I've finished my work already .
*November 13, 2013*

**Maths**

I know it's 125/27 but I need it with a whole number and a fraction
*November 13, 2013*

**Maths**

(9/25)^-3/2
*November 13, 2013*

**Trigonometry desperate help, clueless girl here **

2. solve cos 2x-3sin x cos 2x=0 for the principal values to two decimal places. 3. solve tan^2 + tan x-1= 0 for the principal values to two decimal places. 4. Prove that tan^2(x) -1 + cos^2(x) = tan^2(x) sin^2 (x). 5.Prove that tan(x) sin(x) + cos(x)= sec(x) 6.Prove that tan(x...
*August 16, 2013*

**trig help much appreciated! :))**

alright, I will. Thanks
*August 16, 2013*

**trig help much appreciated! :))**

1. Find the complete exact solution of sin x = . 2. Solve cos 2x – 3sin x cos 2x = 0 for the principal value(s) to two decimal places. 3. Solve tan2 x + tan x – 1 = 0 for the principal value(s) to two decimal places. 4. Prove that tan2 – 1 + cos2 = ...
*August 16, 2013*

**trigonometry help please :(**

2) Simplify √-1-4/5-√-1 A.-1/24+19/24i B.-21/26+1/26i C.-19/24-1/24i D.-1/26-21/26i 3) How many petals do the two rose curves r = 9 cos 61θ and r = 8 sin 60θ have combined? A. 182 B. 242 C. 181 D. 131 4)What is true of the curve r = ƒ(θ) if its ...
*August 16, 2013*

**Trigonometry **

1. Which of the following statements are true? (i) r = 4 – 3 sin θ is the equation for a limaçon rotated 90°. (ii) r = 3 cos 8θ is the equation for a rose curve with 8 petals. (iii) rθ = 16 is the equation for a circle. A. (i) and (iii) B. (i) ...
*August 16, 2013*

**Trigonometry **

1. Which of the following statements are true? (i) r = 4 – 3 sin θ is the equation for a limaçon rotated 90°. (ii) r = 3 cos 8θ is the equation for a rose curve with 8 petals. (iii) rθ = 16 is the equation for a circle. A. (i) and (iii) B. (i) ...
*August 16, 2013*

**economics**

Suppose the demand and supply for milk are described by the following equations: QD = 600 - 100P; QS = -150 + 150P, where P is price in dollars, Q D is quantity demanded in millions of gallons per year, and Q S is quantity supplied in millions of gallons per year 1. Use these ...
*May 10, 2013*

**math((PLEASE HELP!))**

Thank You Very Much
*May 2, 2013*

**math((PLEASE HELP!))**

A contractor has been asked to pave 15 miles of new road. Before he can set his price, he needs to know how much the cement will cost. If the road is 45 feet wide and 9 inches thick and the cost of cement is $35 per cubic yard, what will be the cost of the cement needed for ...
*May 2, 2013*

**Math**

A contractor has been asked to pave 15 miles of new road. Before he can set his price, he needs to know how much the cement will cost. If the road is 45 feet wide and 9 inches thick and the cost of cement is $35 per cubic yard, what will be the cost of the cement needed for ...
*May 2, 2013*

**chemistry**

if burning one mole releases 1310.0 kj, then how many moles will release 227.30?
*April 22, 2013*

**Physics**

What is the minimum height you would have to place a solid ball of mass M and radius R (I=2MR^2/5) on a hill in order for the ball to make it completely around a circular loop at the bottom of the hill? The diameter of the loop is D. Assume the ball rolls without slipping.
*April 3, 2013*

**algebra 1**

one more question... the length of a rectangle is 3 times the width. the area is 108 cm squared. find the dimension of the rectangle.
*April 2, 2013*

**algebra 1**

thanks
*April 2, 2013*

**algebra 1**

is it 5 and 9?
*April 2, 2013*

**algebra 1**

The length of a rectangle is 4m more than the width. The area of the rectangle is 45 m squared. Find the length and width. Please help!
*April 2, 2013*

**math (ms sue) **

how would I factor x to the thrid + 3x squared - x -3 I got (x+3) (x squared -1) and my teacher marked me wrong.
*March 27, 2013*

**algerba**

2k squared + 4k= 10 How would I solve
*March 26, 2013*

**history**

List the mexican war battles in order, by date.
*March 26, 2013*

**History**

Find at least 5 Mexican War battles that took place in Southern California. (Southern California = the ten southern counties.)
*March 25, 2013*

**writing**

My 5th grade year was coming to a close and I, personally, was really looking forward to summer. Two months of sleeping in late and doing whatever. How would I write this...
*March 18, 2013*

**Math **

1. What two numbers can be multiplied to equal -60 and added to be -11? 2. What two numbers can be multiplied to equal -36 and added to be -16? 3. What two numbers can be multiplied to equal 10 and added to equal -7? Thanks
*March 18, 2013*

**Math **

how would I solve 3 square of 6 times square of 6? Sorry, I don't know how to make radicals. Square of means radical
*March 6, 2013*

**Psychology - Please check my answers**

1. When considering marital separation and divorce as a social problem, an effective approach might be to: __x_a. develop counseling options for couples in crisis. ____b. focus on problems with the institution of marriage itself. ____c. develop anger-management programs for ...
*February 26, 2013*

**Psychology - Social Problems**

Please check my answers. 1. When considering marital separation and divorce as a social problem, an effective approach might be to: __x_a. develop counseling options for couples in crisis. ____b. focus on problems with the institution of marriage itself. ____c. develop anger-...
*February 26, 2013*

**math**

Are my answers correct?
*February 4, 2013*

**math**

perform the following unit conversion. 296 0z= ___________ lb 18.5, 55.5, 37, 74 My Answer is 18.5 Perform the following conversion. 32kg= ______ lb 16,320,70.4,14.4 My Answer is 70.4 Some people feel that the ideal temperature for an office space is 72.0 F. What is the ...
*February 4, 2013*

**Math/Fractions**

Thank you!
*February 3, 2013*

**Math/Fractions**

1.Find the LCD and add the fractions. 1/125+4/50= 11/125, 1/1250, 1/35, 551/6250 My answer is 11/125 2.Subtract; then reduce answer to lowest terms. 5/22-1/41= 227/902,183/901,183/902,61/301 My answer is 183/902
*February 3, 2013*

**Fractions**

72, Thank you!
*February 2, 2013*

**Fractions**

Eighty people were invited to vote in the extension club's elections and 9/10 of them voted. How many people voted in the elections? 74, 73, 72, 75 My answer is 73
*February 2, 2013*

**American Gov't**

B. The text says in 1945, the US emerged as a global superpower, a giant in world trade, and the recognized leader of the noncommunist world. C. Because of the presidents constitutional authority as a chief diplomat & military commander & the special demands of foreign policy ...
*January 28, 2013*

**American Gov't**

The president's role in foreign policy increased largely because: A. Congress proved so inept in foreign affairs that the American people demanded a change. B. America became more of a world power. c. of the need to coordinate national economic policy and foreign policy, a...
*January 28, 2013*

**Math**

Suppose you have a graph of a polynomial function and you can see that the function increases without bound on both left and right ends, has 4 real zereos and has 5 turning points. Based on this information, what is the minimum degree of the polynomial?
*January 27, 2013*

**math**

father gives his son three coins totaling 55 cents for school lunch. What coins did the boy receive if one coin is not a nickel?
*December 3, 2012*

**Physics**

A top-gun pilot, practicing radar avoidance maneuvers, is flying horizontally at 1300 km/hr, just 35 m above level ground. Suddenly, the plane encounters terrain that slopes gently upwards at 5, an amount difficult to detect visually. If the pilot doesn’t correct ...
*November 11, 2012*

**Calculus -- HELP!**

If 1200 square centimeters of material is available to make a box with a square base and open top, find the largest possible volume of the box.
*October 20, 2012*

**Calculus**

Use Newton's Method to approximate the positive root of the function f(x) = (x^5) - 20 Show each iteration until successive iterations agree to six decimal places.
*October 20, 2012*

**intermediate algebra**

Y varies directly with square root of X. Y=3 when X=4. find Y when X=1
*October 1, 2012*

**business math**

Hello,I'm just confuse with this problem: Find the due dates of each of the following notes. 1.) Date of loan: October 16, 2001; Time: 120 days. My answer is February 14, 2002.. Im just wondering if my answer is correct.? Thanks.
*September 26, 2012*

**geometry**

6 centimeters i think!
*September 26, 2012*

**math**

find the shift and pick appropriate points. g(x)= -|x-1|+4
*September 25, 2012*

**intermediate algebra**

write the expression in form of a+bi (-2-3i)(1+4i)
*September 25, 2012*

**intermediate algebra**

solve an inequality and indicate the solution set, in interval notation. i need the steps that way i can study it and try to do the rest on my own. 3x+1>2andx-2<7
*September 25, 2012*

**chemistry**

how many joules of nutritional energy are in a bag of chips whose label reads 245 Cal? if 1 lb of fat is stored by the body for each 14.6X10(3) KJ of excess nutritional emergency consumed.how many bags of chips contain enough nutritional energy to result in 1lb of body fat?
*September 11, 2012*

**science **

iron and sulphur reaction
*May 23, 2012*

**mathTonyaMath**

Could you please expalin how you got this answer?
*November 1, 2011*

**Psychology**

How is our behavior affected by others?
*October 23, 2011*

**Physics**

A hovercraft of mass 77.0 kg can move on a horizontal surface, the x-y plane. A single unbalanced force acts on the hovercraft, but the size of the force is unknown. The hovercraft initially has a velocity of 6.0 m/s in the positive x direction and some time later has a ...
*October 10, 2011*

**College Physics**

The driver of a 1600 kg car, initially traveling at 10.6 m/s, applies the brakes, bringing the car to rest in a distance of 23.0 m. (a) Find the net work done on the car. (b) Find the magnitude and direction of the force that does this work. (Assume this force is constant.)
*October 10, 2011*

**Physics**

Tarzan, who weighs 899 N, swings from a vine through the jungle. How much work is done by the tension in the vine as he drops through a vertical distance of 4.45 m?
*October 4, 2011*

**algebra 2**

3x-2y+z=9 x-y+4z=10 2x+3y-z=53
*September 8, 2011*

**math**

please help me
*September 7, 2011*

**math**

1. 5+3*9/3-(-7)= 2. -12*(10-20)<100= help please!!
*September 7, 2011*

**Algebra 8th**

How do you multiply and simplify radical 2(radical 8+ radical 5)?
*May 13, 2011*

**riddle**

what starts with "ne" and is one of nine, and ends with "ne" and is eighth in line
*May 11, 2011*

**SCIENCE HELPP**

You are riding a sled across frictionless ice. It has been given an initial push and is now traveling at a constant velocity, in a straight line.Snow is falling vertically (as seen by a person standing still on the ice), and the snow is accumulating on the sled. You have three...
*May 1, 2011*

**Science**

SRRY You are riding a sled across frictionless ice. It has been given an initial push and is now traveling at a constant velocity, in a straight line.Snow is falling vertically (as seen by a person standing still on the ice), and the snow is accumulating on the sled. You have ...
*May 1, 2011*

**Science**

You are riding a sled across frictionless ice. It has been given an initial push and is now traveling at a constant velocity, in a straight line. Snow is falling vertically (as seen by a person standing still on the ice), and the snow is accumulating on the sled. You have ...
*May 1, 2011*

**chemistry**

4 Fe(s) + 3 O2(g) 2 Fe2O3(s) ΔH = -1652 kJ How much heat is released when 3.82 mol iron is reacted with excess O2?
*March 13, 2011*

**geometry**

a regular hexagon is inscribed in a circle. The radius of the circle is 18 units. What is the area of the region bounded by the inside of the circle and the outside of the hexagon. Round your answer to the nearest hundredth.
*November 30, 2010*

**geometry**

yes
*November 30, 2010*

**geometry**

obtuse triangle ABC with obtuse angle B. Point D on side AC such that angle BDC is also obtuse. Angle DAB is 2/3 of angle ABD. Angle BCD is 1/5 of angle CBD is 4 more than angle BAD. Find the measure of angle ABC.
*November 30, 2010*

**geometry**

right triangle ABC with right angle C, AC=22 and BC=6, altitude CD where D is on hypotenuse AB. What is the ratio of the area of triangle ADC to the area of triangle CDB? Write ratio as n:1 and round n to the nearest hundredth.
*November 30, 2010*

**Math**

For 0 < x < 1, let f(x) = (1 + x)(1 + x4)(1 + x16)(1 + x64)(1 + x256) · · · Compute f to the power of -1 times 8 divided by 5 times f times 3/8
*November 28, 2010*

**Math**

Let AB and CD be two lines intersecting at point O. Let OP be the bisector of angle AOC, OT the bisector of angle POB, and OR the bisector of angle TOD. If angle POR = 25 degrees, find angle AOC and angle AOD.
*November 28, 2010*

**math**

Let AB and CD be two lines intersecting at point O. Let OP be the bisector of ]AOC, OT the bisector of ]POB, and OR the bisector of ]TOD. If ]POR = 25, find ]AOC and ]AOD.
*November 28, 2010*

**math**

For 0 < x < 1, let f(x) = (1 + x)(1 + x4)(1 + x16)(1 + x64)(1 + x256) · · · Compute f−1(8/5f(3/8)
*November 28, 2010*

**math**

For 0 < x < 1, let f(x) = (1 + x)(1 + x4)(1 + x16)(1 + x64)(1 + x256) · · · Compute f−1 8 5f(3/8)
*November 28, 2010*

**math**

For 0 < x < 1, let f(x) = (1 + x)(1 + x4)(1 + x16)(1 + x64)(1 + x256) · · · Compute f−1 8 5f(3/8)
*November 28, 2010*

**math**

A battalion 20 miles long advances 20 miles. During this time, a messenger on a horse travels from the rear of the battalion to the front and immediately turns around, ending up precisely at the rear of the battalion upon the completion of the 20-mile journey. How far has the ...
*November 28, 2010*

**Finance**

A company is considering a plan that has different profit results under different conditions. Assuming there is a 20% chance of a boom and 10% chance of a recession, compute the expected value of their plan. Condition Result Boom $2,000,000 Profit Average $800,000 Profit ...
*November 15, 2010*

**economics**

A company is considering a plan that has different profit results under different conditions. Assuming there is a 20% chance of a boom and 10% chance of a recession, compute the expected value of their plan. Condition Result Boom $2,000,000 Profit Average $800,000 Profit ...
*November 15, 2010*

**english**

for classification what word goes with know,think?
*October 18, 2010*

**calculus**

Find the derivative of the functions: 1) f(x)=x(1-(2)/(x+1)) 2) f(s)=(s^2-2s+5)/(x^(1/2))
*September 23, 2010*

**Economics**

never mind its d
*June 8, 2010*

**Economics**

so is it b for # 5?
*June 8, 2010*

**Economics**

2) d 3)a 4)b 5)c 6)a
*June 8, 2010*

**Economics**

1) Which of the following is an example of a measure of labor productivity? a. Autos get 30 gallons to the mile. b. The growth rate of per capita real GDP is 3.5 percent per year. c. Farm workers produce 30 bushels of wheat per worker per day. d. Wages increase by 3.5 percent ...
*June 8, 2010*

**math**

3:4 228:x x=304 304+228=532
*April 23, 2010*

**5th grade**

is a word or phrase - "thus," "therefore" - that shows that a conclusion is up ahead
*March 13, 2010*

**computers**

. When you link a worksheet and a chart in a business report as well as on a slide, which Microsoft Office applications are integrated? A. Word, Excel, PowerPoint B. Excel, Access, Word C. Word, Access, PowerPoint D. Excel, PowerPoint, Publisher 2. Which one of the following ...
*October 24, 2009*

**Physical Science**

What type of simple machine would you use if the trees have lost their leaves and you have a lot of them to collect?
*October 11, 2009*

**12th grade**

it's C
*February 20, 2009*

**Physics**

thank you. :)
*November 24, 2008*

**Physics**

One application of the index of refraction is analysis of crime scenes. Using the index of refraction, forensic scientists can determine what type of glass has been left at a scene. Read the following and answer the questions below. Different types of glass (bottle, window, ...
*November 24, 2008*

**Physics**

A passenger bus in Zurich, Switzerland derived its motive power from the energy stored in a large flywheel. The wheel was brought up to speed periodically, when the bus stopped at a station, by an electric motor, which could then be attached to the electric power lines. The ...
*November 4, 2008*

**science**

1. A violin string is oscillating at a frequency of 880 Hz (1 Hz = 1 full cycle / second) in its 2nd harmonic. What wold be the frequency of the fundamental vibrational mode? 2. Describe how you would go about finding the frequency of an unmarked tuning fork using the ...
*July 31, 2008*

**Reseach paper**

thank you everyone for the help. I've been researching on the computer for months with no luck. i will look at the sites u recommended. i thought i was taking medical billing not a writing class....
*June 21, 2008*

**Algebra**

I am confused about how to graph two numbers on the same line. I need to graph: x</+ -2 x>/+ -4 both on the same line I have: -6 -5 [-4 -3 -2] -1 0 1 2 solid line I am not sure if I have the right [ or if I need a ( and if I need a solid line.
*March 22, 2008*

**Chemistry**

Do I have this right? Which one of these is the solute and which one is the solvent in a solution composed of a.) 25.0 g. of silver in 5.0 g. of mercury, and b.) 3.0 g. of iodine (I2) in 100.0 mL of ethanol? a.) Mercury is the solute and silver is the solvent. b.) Iodine is ...
*February 8, 2008*

**Dr. Bob**

Phenanthroline (C12H8N2) was added to the colorless prepared solution and a phenanthroline-iron (II) complex was formed. The absorbance of the resulting colored solution was measured on the spectrophotometer and the percent iron was read from a graph that had been prepared ...
*November 19, 2007*

**Dr. Bob**

Okay now can you read my introduction for me please... INTRODUCTION: This report discusses an experiment to study the percent mass of iron determined by the concentration of a colored iron solution from the absorbance of the spectrometer. This lab is designed to determine the ...
*November 19, 2007*

**Dr. Bob**

Dr. Bob can you help me get a concluding sentence to my discussion please
*November 18, 2007*