Wednesday

April 1, 2015

April 1, 2015

Number of results: 3,230

**Physics**

A person heats a can of soup on a stove. If he does 250 Joules of work ON the soup by stirring it as the burner adds 1675 Joules of heat, what is the change in its internal enegry? I did 250- 1675 because the work done On something is negative. can you tell me if thats right.
*March 11, 2012 by angela*

**Chemistry**

a 250.0 ml buffer solution is 0.250 M in acetic acid and. 250M in sodium acetate. what is the ph after addition of. 0050 mol of HCL? what is the ph after the addition of. 0050 mol of NaOH?
*March 7, 2011 by Anonymous*

**Chemistry**

a 250.0 ml buffer solution is 0.250 M in acetic acid and. 250M in sodium acetate. what is the ph after addition of. 0050 mol of HCL? what is the ph after the addition of. 0050 mol of NaOH?
*March 7, 2011 by Anonymous*

**Chemistry Honors**

What volume of a 0.50 M MgSO4 solution will be needed to prepare 100.0 mL of a 0.20 M MgSO4 solution? A.250 mL B.100 mL C.0.250 mL D.40.0 mL
*December 16, 2014 by Tony*

**Physics**

A 0.250-kg ice puck, moving east with a speed of 5.26m/s , has a head-on collision with a 0.990-kg puck initially at rest. Assume that the collision is perfectly elastic.What is the speed of the 0.250-kg puck after the collision?
*October 29, 2014 by david*

**dade**

If a stone is tossed from the top of a 250 meter building, the height of the stone as a function of time is given by h(t) = -9.8t2 – 10t + 250, where t is in seconds, and height is in meters. After how many seconds will the stone hit the ground? Round to the nearest hundredth...
*December 20, 2010 by max *

**math**

If a stone is tossed from the top of a 250 meter building, the height of the stone as a function of time is given by h(t) = -9.8t2 – 10t + 250, where t is in seconds, and height is in meters. After how many seconds will the stone hit the ground? Round to the nearest hundredth...
*May 2, 2011 by carol*

**math**

If a stone is tossed from the top of a 250 meter building, the height of the stone as a function of time is given by h(t) = -9.8t2 – 10t + 250, where t is in seconds, and height is in meters. After how many seconds will the stone hit the ground? Round to the nearest hundredth’...
*May 3, 2011 by carol*

**Chemistry**

Phosphorus pentachloride decomposes according to the chemical equation: PCl5(g)<--> PCl3(g)+Cl2(g) Kc = 1.80 at 250 degrees Celsius A 0.352 mol sample of PCl5(g) is injected into an empty 4.45 L reaction vessel held at 250 °C. Calculate the concentrations of PCl5(g) and ...
*March 8, 2013 by Laura*

**Algebra**

Twenty-five percent of your budget will be used to rent business space and pay for utilities. Write an algebraic expression that indicates how much money will be spent on business space and utilities. 2nd question. .25($118,250.00) correct answer? .25($118,250.00)
*January 22, 2008 by Mckenzie*

**math**

use the divisibility rules to determine wheather the first number is divisible by the second. 1.279;3 -279/3=93 2.1,240;6 -1,240/6=206.6666667 3.3,250;5 -3,250/5=650 4.835;4 - 835/4=208.75 5.1,249;8 - 1,249/8=156.125 6.2,352;2 - 2352/2=1176
*August 2, 2010 by kamleen*

**algebra**

an investor has increased my budget by $22,250. The investor does not need to be repaid but rather he becomes part owner of my business. Will the investor contribute enough money to meet the cost of rent and utilities? I must support my answer and write an equation or ...
*April 5, 2010 by renee*

**chemistry**

Which sample has the most solute? Question 15 options: 200. mL of 0.200 M MgCl2 150. mL of 0.250 M MgCl2 100. mL of 0.300 M MgCl2 100. mL of 0.250 M MgCl2
*November 12, 2014 by Brendon*

**calc/physics**

A force of 250 N is required to stretch a spring 5m from rest. Using Hooke's law, F=kx, how much work, in joules, is required to stretch the spring 7m from rest? The energy required scales with x^2. Multiply 250 J by (7/5)^2.
*April 23, 2007 by Mischa*

**math physics**

A meteorite is a solid composed of stone and/or metal material from outer space that passes through the atmosphere and hits the earth’s surface. Find the kinetic energy of a meteorite with mass 250 kg that hits the earth at 25 km/s. Given: m=250kg v=2.5E4m/s <<< ...
*October 13, 2014 by Jay*

**math physics**

A meteorite is a solid composed of stone and/or metal material from outer space that passes through the atmosphere and hits the earth’s surface. Find the kinetic energy of a meteorite with mass 250 kg that hits the earth at 25 km/s. Given: m=250kg v=2.5E4m/s <<< ...
*October 13, 2014 by Jay*

**math physics**

A meteorite is a solid composed of stone and/or metal material from outer space that passes through the atmosphere and hits the earth’s surface. Find the kinetic energy of a meteorite with mass 250 kg that hits the earth at 25 km/s. Given: m=250kg v=2.5E4m/s <<< ...
*October 13, 2014 by Jay*

**chemistry**

A 0.5215 gram sample of CaCO3 is dissolved in 12M HCl and the resulting solution is diluted to 250.0 mL in a volumetric flask. How many moles of CaCO3 are used? What is the molarity of the Ca2+ in the 250 mL of solution? How many moles of Ca2+ ae in a 25.0 mL aliquot of the ...
*April 28, 2009 by saddee*

**Chemistry**

Plot data, preform interpolations or extrapolations, determine slope of best line, determine y intercept. Write equation of the line. T in Kelvins40.0 70.0 100.0 120.0 0 V in ml 250.0 430.0 610.0 730.0 0 Value of V at T= 50.0? Value of T when V= 800.0? 1.So, I made a graph ...
*September 25, 2011 by Connie*

**Chemistry**

A sealed balloon is filled with 1.20 L of helium at 23°C and 1.00 atm. The balloon rises to a point in the atmosphere where the pressure is 250. torr and the temperature is -27°C. What is the change in volume of the balloon as it ascends from 1.00 atm to a pressure of 250. torr?
*November 21, 2011 by Alice*

**chemistry**

Phosphorus pentachloride decomposes according to the chemical equation PCl5(g) -----> PCl3 (g)+ Cl2(g) Kc= 1.80 at 250 degrees C A 0.463 mol sample of PCl5(g) is injected into an empty 4.80 L reaction vessel held at 250 °C. Calculate the concentrations of PCl5(g) and PCl3(g...
*March 9, 2012 by Sarah*

**Math 540**

The Department of Management Science at Tech has sampled 250 of its majors and compiled the following frequency distribution of grade point averages (on a 4.0 scale) for the previous semester. GPA Frequency 0-0.5 1 0.5-1.0 4 1.0-1.5 20 1.5-2.0 35 2.0-2.5 67 2.5-3.0 58 3.0-3.5 ...
*May 16, 2011 by Cassie*

**Chemistry(Please check)**

1) If exactly 100.0 grams of NaCl (mm=58.44g/mol) are dissolved in 300 grams of water (mm=18.02g/mol), the mole fraction of NaCl is? a) 1.71 b) 0.0932 c) 0.250 d) 0.103 e) 4.75 I did 100g / 100g + 300g = 100/40 = 0.250. Did I do this correctly?
*February 10, 2012 by Hannah*

**Chemistry**

Phosphorus pentachloride decomposes according to the chemical equation PCl5(g) <-> PCl3(g)+Cl2(g) Kc=1.80 at 250 degrees Celsius A 0.222 mol sample of PCl5(g) is injected into an empty 3.25 L reaction vessel held at 250 °C. Calculate the concentrations of PCl5(g) and ...
*March 3, 2013 by J*

**Math**

Having trouble figuring out this problem. I'm supposed to write the inequality for this problem. Vijay wans to keep the cost per person of his party under $15. The Party Place charges a flat fee of $250 for an all inclusive party. Let g represent the number of guests, ...
*April 30, 2013 by Brandi*

**physics**

A plane flying horizontally at a constant velocity drops a bomb on a cave from a height of 500 m. At the moment the bomb hits the ground, the plane is A.) 250 meters beyond the cave B.) Directly over the cave C.) 250 meters from the cave D.) Some other wild guess
*September 28, 2011 by Amanda*

**algebra**

1. You have recently found a location for your bakery and have begun implementing the first phases of your business plan. Your budget consists of an $80,000 loan from your family and a $38,250 small business loan. These loans must be repaid in full within 10 years. a. What ...
*March 16, 2010 by sally*

**Math problem**

1.You have recently found a location for your bakery and have begun implementing the first phases of your business plan. Your budget consists of an $80,000 loan from your family and a $38,250 small business loan. These loans must be repaid in full within 10 years. a.What ...
*November 20, 2011 by Avery*

**Math**

Joe weighs 30 lbs less than twice ken's weight. If ken gains 10 pounds then together they would weigh 250 pounds. How much does each of them weigh? let x be ken's weight. my work: 2x - 30 = j x+ 10 + J = 250 and now im stuck, can someone show me how to find their weight and ...
*June 2, 2013 by Paige*

**chemistry**

200cm^3 of 1.0 mol dm^-3 sulphuric acid,H2SO4 is poured into a 250 cm^3 volumetric flask.Distilled water is then added to make 250 cm^3 of solution. (a)What is the molarity of the diluted acid solution? (b)What is the volume of 1.6 mol dm^-3 sodium hydroxide,NaOH solution ...
*May 7, 2014 by mandy*

**Algebra HELP**

1.You have recently found a location for your bakery and have begun implementing the first phases of your business plan. Your budget consists of an $80,000 loan from your family and a $38,250 small business loan. These loans must be repaid in full within 10 years. a)What ...
*May 22, 2008 by Anonymous*

**physics**

can you help me through this? A boat moves through a river at 7.0 m/s relative to the water, regardless of the boat's direction. If the water in the river is flowing at 3.5 m/s, how long does it take the boat to make a round trip consisting of a 250 m displacement downstream ...
*November 7, 2010 by Maria*

**Calculus **

A company decides to begin making and selling computers. The price function is given as follows: p=−70x+4000, where x is the number of computers that can be sold at a price of p dollars per unit. Additionally, the financial department has determined that the weekly fixed...
*March 30, 2015 by Anonymous*

**math**

1. You have recently found a location for your bakery and have begun implementing the first phases of your business plan. Your budget consists of an $80,000 loan from your family and a $38,250 small business loan. These loans must be repaid in full within 10 years. The first ...
*September 26, 2009 by Anonymous*

**chemistry**

A vitamin C tablet containing 250 mg of ascorbic acid (C6H7O6; Ka = 8.0 x 10-5 is dissolved in a 250 mL glass of water. What is the pH of the solution? i tried answering this question multiple times but i still get it wrong.... can someone help? step-by-step please. what i did...
*March 20, 2012 by Finding the pH of a weak acid?*

**math problem**

please help me solve You have recently found a location for your bakery and have begun implementing the first phases of your business plan. Your budget consists of an $80,000 loan from your family and a $38,250 small business loan. These loans must be repaid in full within 10 ...
*November 21, 2011 by Lavern*

**mat 116/algebra**

A cylinder has a radius of 5 in. If the volume of the cylinder is 250ƒà in.3, what is the height of the cylinder? [Hint: The volume of a cylinder is given by V = ƒàr2h.] I think I wrote it wrong the first time. The volume of a cylinder is pi r^2 h. Your computer seems to be ...
*May 13, 2007 by Dee*

**accounting**

Schumacher Company uses the perpetual inventory system, and it engaged in the following transactions during 2012: 1) Started the business by issuing common stock for $7,500 cash 2) Paid cash to purchase $5,000 of inventory 3) Sold inventory that cost $3,000 for $7,250 cash 4) ...
*March 7, 2012 by Anonymous*

**chemistry**

Problem: Need to prepare a 250 mL buffer of pH 7.00 using equimolar K2HPO4 and KH2PO4 solutions. Ka for phosphoric acid: Ka1=7.2 x 10^-3 Ka2=6.3 x 10^-8 Ka3=4.2 x 10^-13 I though the hard part of this was picking the right equation/Ka value, but I am not getting the right ...
*February 22, 2015 by lauraK*

**physics**

The coordinates of point 1 are 250 units of X and 40 units of Y. The coordinates of point 2 are 250 units of X and 70 units of Y. The slope of the line between points 1 and 2 is what?
*September 29, 2010 by murelan*

**math 117/algebra**

The US population 1990 was approximately 250 million, and the average growth rate for the past 30 years gives a doubling time of 66 years. The above formula for the US then becomes P(in millions) = 250 x 1(y - 1990)/66 (1) What will the population of the US be in 2025 if this ...
*June 22, 2007 by Diana*

**math**

in 2000 one small town had 250 city employees. in 2005 it had 325 employees. A. use the coordinates (0,250) and (5,325) to find the equation in point slope form that represents the average rate of increase for the number of employees. B. find the number of employees in 2010
*July 5, 2012 by chchch*

**CHM 152**

Consider the following equilibrium: PCl3 + Cl2 = PCl5 Kc=26 @ 250 degree Celcius 1.0 mol of PCl3 , 1.0 mol of Cl2 , and 5.0 mol of PCl5 are placed in a 10.0L flask at 250 C and allowed to come to equilibrium. What is the concentration, in M, of at equilibrium? Choose one ...
*March 26, 2010 by AMI*

**Business**

Robert recently was hired as a technician in the firm. He is being paid $1,250 every two weeks ( after taxes). His monthly bills are: Rent: $900 electricity: $110 car payment: $350 car insurance: $60 fuel for cars: $90 groceries: $180 credit cards: $250 Given Robert's expenses...
*August 30, 2012 by John*

**Chemistry**

Mass of an aspirin tablet is 0.42g and contains 77.38% ASA by mass. I dissolved the tablet in hot naOH and cooled the solution with distilled water to the mark of 250 volumetric flask. Then I pipetted 5.0 mL of the solution to the 100 mL volumetric flask and I diluted it with ...
*April 25, 2007 by Brissa*

**Finance**

Given an interest rate of 6.25% compounded annually, how much would you accumulate if you started with $3,250 and then contributed $1,950 per year (at the end of each year) for 13 years? Is this correct? Calculate each FV and sum? PV1 = 3,250 i = 6.25% N = 13 FV = PV2 = 1,950 ...
*February 3, 2015 by Jessica*

**chm152**

PCl3 + Cl2 = PCl5 Kc=26 @ 250 degree Celcius 1.0 mol of PCl3 , 1.0 mol of Cl2 , and 5.0 mol of PCl5 are placed in a 10.0L flask at 250 C and allowed to come to equilibrium. What is the concentration, in M,of cl2 of at equilibrium? Choose one answer. a. 3.4 b. 0.19 c. 0.16 d. 0...
*March 26, 2010 by ami*

**algebra**

painting is purchased for $250. If the value of the painting doubles every 5 years, then its value is given by the function V(t) = 250 • 2t/5, where t is the number of years since it was purchased and V(t) is its value (in dollars) at that time. What is the value of the ...
*August 6, 2011 by soka*

**Medical Billing and Coding**

This is a 71-year-old female admitted with a complaint of right-sided weakness. She denies any fever, shortness of breath, cough, headaches, or chest pain. Patient has NIDDM, controlled by diet. Patient currently smokes. Mild right-sided paralysis was found on physical ...
*November 1, 2013 by Lisa*

**College Statistics**

The brightness of sunlight at the earth's surface changes over time depending on whether the earth's atmosphere is more or less clear. Sunlight dimmed between 1960 and 1990. After 1990, air pollution dropped in industrial countries. Did sunlight brighten? Here are data and ...
*September 6, 2011 by gandakho*

**CHEMISTRY**

how many grams of sodium carbonate are needed to prepare 0.250 L of an 0.100 M aqueous solution of sodium ions? well normally you go moles=grams/molar mass than M= moles/L but when looking for grams? what do you do........multiple .250 by .100 than divide by the molar mass of ...
*December 13, 2010 by STACY*

**chem**

A 1.00 L flask containing 450 torr of H2 is connected to and mixed with a second flask with a volume of 0.500 L containing 250 torr N2. What is the final pressure of the resulting mixed gas system? a) 250 torr b)383 torr c) 450 torr d) 575 torr e) it cannot be determined
*December 2, 2007 by Matt*

**year 8 maths**

Find the amount of the following foreign currencies (to 2 decimal places) that can be bought with 250 Singapore dollars. The sterling pound There is a chart and the pound sells at 2,552,0 for 1 Singapore dollar. The pound is bought at 2,578.0. I did 2,552.0 times 250 and got ...
*December 11, 2009 by Maria Chiara*

**chemistry**

STANDARD: Put into a clean 250 mL volumetric flask exactly ..... 0.90 ml of 1.00 mM iodate STANDARD. Add an excess of 1M KI and 1M Sulfuric Acid and let stand for 5 minutes. Dilute to volume. UNKNOWN: Pipet into a clean 250 mL volumetric flask 1.00 mL of your UNKNOWN and ...
*July 28, 2013 by faruk*

**accounting **

I am calculating inventory methods and wanted to see if anyone could double check my figures? See below weighted Average Date Transaction Units 1-Apr Purchase 250 Unit Cost Ext Cost 5-Apr Sold 10 $10.00 2500 10-Apr Sold 10 15-Apr Purchase 200 $15.00 3000 20-Apr Sold 250 25-Apr...
*August 17, 2010 by Debbie*

**engr. econ.**

homeowener is considering refinancing his home. original amount of the 30 yr loan was 250,000 at 12% compounded monthly. The owner has made ten years of payments. how much is the remaining balance on the loan. this is what I gotL r=12%, m=12, i=12%/12=1%/month I have to find ...
*April 21, 2009 by jen*

**Math **

Below is a table showing the cost lawn maintenance service charges for various commercial and retail properties. Cost of lawn maintenance ($) 640, 250, 500, 640, 720, 640, 250, 720 A. Find the mean absolute deviation for the lawn maintenance company B. Describe what this ...
*December 7, 2014 by Suzy*

**Calculus **

Your firm offers to deliver 250 tables to a dealer, at $160 per table, and to reduce the price per table on the entire order by 50 cents for each additional table over 250. Find the dollar total involved in the largest possible transaction between the manufacturer and the ...
*November 3, 2014 by Jose*

**Calculus**

The hemispherical tank shown is full of water. Given that water weighs 62.5 lb/ft3, find the work required to pump the water out of the tank. ---------- What is shown is just the tank (a hemisphere) with a radius of 5 ft. ---------- First I calculated the Volume of the ...
*June 17, 2007 by COFFEE*

**chemistry**

3. After removing membranes from an eggshell, the shell is dried and its mass is recorded as 5.613 g. The egg is transferred to a 250 mL beaker and dissolved in 25 mL of 6 M HCL. After filtering, the solution containing the dissolved eggshell is diluted to 250 mL in a ...
*November 18, 2014 by James*

**Physiology**

Suppose a salt and a glucose solution are separated by a membrane that is permeable to water but not to the solutes. The NaCl solution has a concentration of 1.95 g per 250 mL (molecular weight = 58.5). The glucose solution has a concentration of 9.0 g per 250 mL (molecular ...
*May 14, 2011 by ivy*

**maTHS**

A shop reduces al its 30% in a closing down scale. What is the original price of a television now priced at £175? Explain your working carefully. Do I do 175/ 100 x 30 = £53 £175 + £53 = £228 is the original price of the television. is this right?? You could set up a ...
*June 8, 2007 by sarah*

**Accounting**

What is your margin tax rate________ and what is your average tax rate_________? During the year you earned $48,000 after deductions and exceptions and paid $8,188 in taxes. Tax rate over up to 10% 0 8,350 15% 8,350 33,950 25% 33,950 82,250 28% 82,250 171,550 33% 171,550 372,...
*December 13, 2009 by Emma*

**Microeconomics**

Suppose Dell is currently selling 250,000 laptops per month. A mgr at Dell argues, "The last 10,000 laptops we producted increased our revenue by $8.5 million. However, because we are making a substantial total profit of $25 million from producting 250,000 laptops, I think we ...
*January 23, 2008 by Jamie*

**MATH**

1. Terre Haute to Indianapolis to Bloomington measures 3 cm on the map. What is the actual distance? 100 km 150 km 200 km 250 km 2. Fort Wayne to Richmond to New Albany measures 6 cm on the map. What is the actual distance? (1 point) 300 km 250 km 350 km 400 km 3. If your ...
*December 7, 2012 by Help!!!!!!!!!!!!!! Fast its urgent Please!!!!!!!!!*

**Business Math**

Juan Ramirez sells suits in a major department store on weekends. He earns a commission of 5 percent on the first ten suits, and if he sells more than ten, he earns an additional 3 percent on the additional suits. Last weekend Juan sold thirteen $250.00 suits. What was his ...
*December 5, 2013 by Cassie*

**physics**

According to recent test data, an automobile travels 0.250 mi in 19.9 s, starting from rest. The same car, when braking from 60.0 mi/h on dry pavement, stops in 146 ft. Assume constant acceleration in each part of the motion, but not necessarily the same acceleration when ...
*September 1, 2010 by Ami*

**Econ/statistics**

The monthly earnings of teachers is normally distributed with a mean of $3,000 and the standard deviation of $250. We select a sample of 87 teachers. The sampling distribution of the sample mean has an expected value and standard deviation of: a.) 3,000 and 26.8 b.) 3,000 and ...
*May 3, 2011 by Sara*

**Physics ( just need a lil help multiplying**

Calculate the force of gravity between a 2.50 kg newborn baby and a 80.0 kg doctor standing 0.250 m away. G = 6.67 E -11 N*m2/kg2 My work Fg = (Gm1 Gm2) /d^2 m1=2.50 kg m2=80.0 kg d=0.250 m g=6.67 E -11 N*m2/kg2 Fg = (Gm1 Gm2) /d^2 Fg= g ( 2.50 kg)(80.0 kg)/0.250m^2 Fg= (6.67 ...
*February 1, 2008 by Bongo*

**chemistry**

An aspirin tablet weighing 0.548 g has been analyzed and contains 68.2 % ASA (180.16 g/mol) by mass. A student dissolved the tablet in hot NaOH and the cooled solution was diluted with DI water to the mark in a 250 mL volumetric flask. Exactly 3.00 mL of the solution was ...
*May 10, 2007 by jared*

**Physics**

In a hydraulic lift, if the radius of the smaller piston is 2 cm and the radius of the larger piston is 20 cm, what weight can the larger piston support when a force of 250 N is applied to the smaller piston? d = diameter of smaller piston D = diameter of larger piston I just ...
*December 14, 2009 by Ian*

**math **

The volume of each shape is 250 cubic inches. A) Find the height of a cylinder with a radius of 3 inches. 250/3^2/ 3.14 = height of cylinder? B)Find the radius of the sphere. Is it just 3 inches? C) Find the height of a cone with a radius of 3 inches. I need help with this can...
*May 16, 2012 by lila*

**Math Gr12 Advanced Functions**

I am stuck on this one part of this question: The function S(d)=93(logd)+65 relates the speed of the wind S, in miles per hours, near the centre of a tornado to the distance that the tornado travels,d,in miles. If a tornado has sustained winds of about 250 mph, estimate the ...
*July 22, 2012 by Billy Bob*

**physical aspects of nature**

A 1,440-N crate is being pushed across a level floor at a constant speed by a force of 250 N at an angle of 20.0° below the horizontal; (a) What is the coefficient of kinetic friction between the crate and the floor? (b) If the 250-N force is instead pulling the block at an ...
*March 15, 2012 by greg*

**physics**

1. Vector B is in the third quadrant, therefore its x and y components are negative. If B's direction is 218 degrees (counter clockwise from the positive x-axis) then which expression best describes B's x-component? 1. B*sin(38) 2. B*cos(38) 3. B*tan(38) 4. B*cos(218) 5. B*tan...
*August 29, 2005 by Nisar*

**molarity**

An aspirin tablet weighing 0.475 g has been analyzed and contains 68.2 % ASA (180.16 g/mol) by mass. A student dissolved the tablet in hot NaOH and the cooled solution was diluted with DI water to the mark in a 250 mL volumetric flask. Exactly 3.00 mL of the solution was ...
*February 16, 2007 by christine*

**Chemistry**

A student was given 100mL of HCL solution in a 250mL beaker and told that the HCL was 0.11M. The student was also given phenolphthalein indicator and 250 ML of 0.1234 M NaOH. The student first filled a buret with NaOH solution. The student then placed an appropriate volume of ...
*November 21, 2013 by Lenny*

**chemistry**

The density of liquid water is 0.997 g/mL at 25 degrees Celsius. a) Calculate the mass of 250.o mL (about a cupful) of water. b) How many moles of water are in 250.0 mL of water? Use the result from letter a. c) Calculate the volume that would be occupied by 2.000 mol of water...
*November 15, 2011 by khloe*

**Algerbra**

The U.S. population in 1990 was approximately 250 million, and the average growth rate for the past 30 years gives a doubling time of 66 years. The above formula for the United States then becomes P (in millions)= 250 x 2( y-1990)/66 1.What was the approximate population of ...
*June 28, 2007 by Angela*

**Physics/Math**

A 25.0 gram piece of charcoal is found in some ruins of an ancient city. The sample shows a 14C activity, R, of 250 decays/min. How long (in years) has the tree this charcoal came from been dead? I think I have the use the equation: R=lamda*No*e^(-lamda*t) but I am not sure ...
*February 3, 2015 by Kristina*

**math**

The mean earnings of four plumbers are 40,250, 45,250,63,600, 125,000 The owner of a plumbing business earns 125,000. Do you think the mean of all four plumbers earnings,which is 68,525, accurately represents what an average plumber earns? What do you think the average should be?
*April 30, 2012 by Cherie*

**statistics**

Looking for help with some of my stats homework, I got parts of it but then hit a brink wall. Any help would be welcome. A recruiter estimates that if you are hired to work for her company and you put in a full week at the commissioned sales representative position she is ...
*November 1, 2010 by Valerie*

**accounting**

I got this of this web site but I don't understand where it all goes. this is the one I am working on. I need help. Part 1 BULLSEYE RANGES For Year Ended December 31, 2005 Unadjusted Trial Balance Adjustments Adjusted Trial Balance Account Title Dr. Cr. Dr. Cr. Dr. Cr. Cash 13...
*June 10, 2011 by shawna*

**calc**

q 0 125 250 375 500 625 750 C'(q) 27 35 41 45 43 46 51 Give fixed cost = 8800 and cost of producing 250 units is 17425, how much would the total cost increase if production were increased one unit, to 251 units? --- A cup of coffee at 90 degrees celsius is put into a 30 degree...
*July 21, 2014 by anon*

**Algebra**

Bayside Insurance offers two health plans. Under plan A, giselle would have to pay the first $190.00 of her medical bills, plus 25% of the rest. Under plan B, Giselle would pay the first $250, but only 20% of the rest. For what amount of meidcal bills will plan B save Giselle ...
*September 2, 2010 by Norma*

**Algebra-help**

Jordan decides to start a garden care service. He plans to charge $20 for the first hour and $10 for each additional hour that he spends working on a garden. He works 5 days a week and takes care of one different garden each day. How many hours will he need to work if he wants...
*February 1, 2013 by Deborah*

**Health Administration**

Bayside insurance offers two health plans. Under plan A, Giselle would have to pay the first $60 of her medical bills, plus 25% of the rest. Under plan B, Giselle would pay the first $250, but only 20% of the rest. For what amount of mediacl bills will plan B save Giselle ...
*January 15, 2010 by Frank*

**algebra**

Bayside Insurance offers two health plans. Under plan A Gisielle would pay the first $110 of her medical bills plus 30% of the rest. Under plan B, Gisielle would pay the first $250, but only 20% of the rest. For what amount of medical bills will plan B save Giselle money? ...
*July 29, 2011 by tara lee*

**are these correct**

b. Calculate the profit or loss on 12,000 bags and on 25,000 bags. 12,000 x $10 = 120,000 80,000 + .10 x 50lbs x 12,000 = 80,000 + 60,000 = 140,000 120,000 – 140,000 = -20,000 loss 25,000 x $10 = 250,000 80,000 + .10 x 50lb x 25000 = 80,000 + 125000 = 205,000 250,000 – 205,000...
*July 30, 2009 by scooby9132002*

**equilibrium**

The standard solution of FeSCN2+ (prepared by combining 9.00 mL of 0.200 M Fe(NO3)3 w/1.00 mL of 0.0020 M KSCN) has an absorbance of 0.510. If a trial's absorbance is measured to be 0.250 and its initial concentration of SCN– was 0.00050 M, the equilibrium concentration of SCN...
*April 4, 2007 by Christine*

**Solution Preparation**

I need help with Writing a Report Purpose: Preparing 0.2 M 250 ml NaOH solution? Equipments and Materials: Equipments: -Balance -Beaker(250ml) -Graduated cylinder Materials: -Pure water -NaOH Procedure: 1)Calculate the required amount of NaOH in gr. 2)Weight calculated amount ...
*March 2, 2012 by Rustam*

**Chemistry**

Use the dilution relationship (Mi x Vi = Mf x Vf) to calculate the volume of 0.500 M NaOH needed to prepare 500 mL of .250 M NaOH. This is my work ? L Solution = 500mL x (1L/1000mL) = .500L ? mol NaOH = .500 L Solution x (0.250 M NaOH/1 L Solution) = .125 mol NaOH ? L solution...
*February 28, 2009 by Bob*

**CheMistry**

A stock solution was prepared by dissolving exactly 0.4000 g of pure ASA (180.16 g/mol) in 10.00 mL of NaOH and heating the solution to a gentle boil. After cooling to room temperature, the solution was poured into a 250-mL volumetric flask and diluted to the mark with DI ...
*April 18, 2010 by ChEm*

**chem biochem bio**

You have the following stock solutions and solid chemicals in your lab: 1.5M NaCL 0.2M Tris buffer, pH 8.0 10 mg/ml Bovine serum albumin (BSA) MgCl2 (solid, anhydrous) MW = 95.211 g/mole (95% pure) How would you make 250 ml of the following solution??? 0.2M NaCl 0.05M Tris, pH...
*March 10, 2013 by mel*

**physics**

a) If a photon and an electron each have the same energy of 20.0 eV, find the wavelength of each. b) If a photon and an electron each have the same wavelength of 250 nm, find the energy of each. c) You want to study an organic molecule that is about 250 nm long using either a ...
*April 5, 2011 by Jennifer*

**math!**

Radu has just returned from a business trip in Britain with £250 of uncashed traveller's cheques. How much would he receive from the bank when he converts the currency back to Canadian dollars, assuming that the bank offers an exchange rate of C$1.00 = £0.4470 and charges a 0....
*February 6, 2010 by *Thara* *

**math**

the local lions club sold raffle tickets for a new golf caqrt. the sales for each week are given below. if more tha 250 tickets are sold, then the lions club raised enough for the golf cart. use the inequality t>250, where t representrs the number of tickets sold, to ...
*February 16, 2015 by spartans*

**Math**

Gymnast Clothing manufactures expensive hockey jerseys for sale to college bookstores in runs of up to 250. Its cost (in dollars) for a run of x hockey jerseys is C(x) = 2500 + 10x + 0.2^x2(0 ≤ x ≤ 250) Gymnast Clothing sells the jerseys at $105 each. Find the ...
*February 9, 2012 by Anne*

**C#**

Create an application that determines the total due including sales tax and shipping. Allow the user to input any number of item prices. Sales tax of 7% is charged against the total purchases. Shipping charges can be determined from the following chart. Display an itemized ...
*August 11, 2013 by C#*

**math**

Bayside Insurance offers two health plans. Under plan A, Giselle would pay the first $150 of her medical bills, plus 40% of the rest. Under plan B, Giselle would pay the first $250, but only 35% of the rest. For what amount of medical bills will plan B save Giselle money? ...
*March 19, 2010 by Kristen*

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