# nancy

Most popular questions and responses by nancy-
## Math

One car is 3.9 meters long the other is 6%shorter How long is second car? What is the formula I use for questions involving %

*asked on January 4, 2016* -
## maths

a carpenter has a board that is 8 ft long. he cuts off two piece.one piece is 3 1/2 ft long and other is 2 1/3ft long.How much off the board is left.

*asked on February 26, 2015* -
## Chemistry

A certain indicator, HA, has a Ka value of 1.3 × 10-6. The protonated form of the indicator is blue and the ionized form is red. What is the pKa of the indicator? What is the color of this indicator in a solution with pH = 8? Blue, red, or purple?

*asked on February 26, 2013* -
## english

Which group of words is the sentence below misplaced? Having been discovered, Fifi looked up at his owner with puppy-dog eyes. a)with puppy-dog eyes b)been discovered c)his owner d)Fifi looked up

*asked on August 4, 2010* -
## Chemistry

The triprotic acid H3A has ionization constants of Ka1 = 6.8× 10–3, Ka2 = 8.1× 10–9, and Ka3 = 5.0× 10–12. Calculate the following values for a 0.0760 M solution of NaH2A [H+] = ? [H2A-]/[H3A]= ? Calculate the following values for a 0.0760 M

*asked on February 26, 2013* -
## chemistry

I have: the half life of U-238 is 4.5 x 10^9 yr. A sample of rock of mass 1.6g produces 29 disintegrations per second. find percent by mass of U-238 in rock. I have 4.5x 10^9x60x60x365x24=1.419x 10^17= .693/1.419 x10^17 =4.883x10^-18 =rate 1.6/238=.006722

*asked on June 17, 2012* -
## Chemistry

What fraction of piperazine (perhydro-1,4-diazine) is in each of its three forms (H2A, HA–, A2–) at pH 7.22?

*asked on February 26, 2013* -
## Chemistry

This question has been bugging me for a long time. A rock contains a Pb-206 to U-238 mass ratio of .145 to 1.00. Assuming that it did not contain any Pb-206 at the beginning of its formation, determine its age. I assume from the other problems in my book

*asked on February 23, 2013* -
## Gr.11 Math

A large company has a phone tree to contact its employees in case of an emergency factory shutdown. Each of the five senior managers calls three eployees, who calls three other employees and so on. If the tree consists of seven levels, how many employees

*asked on January 5, 2009* -
## chemistry

Find the number of disintegrations per minute emitted by 1.1 mol of 232-Th in 1 min. The half-life of 232-Th is 1.4 x 1010 year I was able to do this with the following technique: 1.1 x 6.022 x10^23 =6.62x10^23 1.4x10^10=7.358x10^15 minutes I think then it

*asked on August 2, 2012* -
## Math

A letter is chosen randomly from the 26 letters in the alphabet. Find the probability of choosing a consonant.

*asked on March 9, 2016* -
## Chemistry

Why does equilibrium shift to the left when AgNO3 is added to the equation Co(H20)6 (aq) + 4Cl- (aq) CoCl4 (aq) + 6H2o(l)?

*asked on April 8, 2012* -
## chemistry

I have a problem like this: CHCl3 + Cl2 = CCl4 +HCL This is the rate table: CHCL3 Cl2 Initial Rate .010 .010 .0035 .020 .010 .0069 .020 .020 .0098 .040 .040 .027 They want me to find the rate constant and the rate law.

*asked on February 23, 2013* -
## Chemistry

Determine the final end (final) value of n in a hydrogen atom transition, if electron starts in n = 1 and the atom absorbs a photon of light with an energy of 2.044 X 10^-18J? A) 3 B) 4 C) 2 D) 6 E) 5

*asked on November 28, 2011* -
## chemistry

A 1.50 liter gas sample at 745mm HG and 25 celsius contains 3.55% radon by volume radon-220 is an alpha emitter with a half life of 55.6 seconds. how many alpha particles are emitted in 5 minutes by this sample? I got an answer 1.59x10^19 I started at

*asked on June 17, 2012* -
## physics

When the thigh is fractured, the patient's leg must be kept under traction. One method of doing so is a variation on the Russell traction apparatus. (See the figure.) Please place period in place of (dot) oi53(dot)tinypic(dot)com/2a0b7yx(dot)jpg If the

*asked on March 4, 2011* -
## calculus

a toy wagon is pulled by exerting a force of 15 pounds on a handle that makes a 30 degree angle with the horizontal. find the work done in pulling the wagon 50 feet.

*asked on May 12, 2010* -
## Chemistry

How many moles of ions are released when these samples are dissolved in water? a. 0.37 mol of NH4Cl b. 3.55 * 10^18 formula units of Ba(OH)2 * 8H2O I need to know what steps to take to get to the answer. Thanks!

*asked on November 2, 2009* -
## math

A clerk spent his 35 hour work week as follows: 1/5 of his time in sorting mail; 1/2 of his time in filing letters; and 1/7 of his time in reception work. The rest of his time was devoted to messenger work. The percentage of time spent on messenger work by

*asked on September 25, 2015* -
## physics

A racing dog is initially running at 20.0 m/s, but is slowing down. Question: How fast is the dog moving when its kinetic energy has been reduced by half? Question: By what fraction has its kinetic energy been reduced when its speed has been reduced by

*asked on March 21, 2011* -
## Science

Methanol reacts with carbon monoxide in the presence of a catalyst to produce ethanoic acid. Reacted completely with carbon monoxide in a reaction vessel. What is the theoretic yield of ethanioc acid?

*asked on February 8, 2019* -
## Maths

In an election there were 3 candidates 3/7 of the electors voted for the winner. The runner up received 5/8 of the remaining votes, what fraction of the electors voted for the third candidate

*asked on June 16, 2016* -
## PHYSICS CENTER OF MASS

A thin rectangular plate of uniform areal density σ = 2.79 kg/m2 has length of 37.0 cm and width of 23.0 cm. The lower left hand corner is located at the origin, (x,y)= (0,0) and the length is along the x-axis. (a)There is a circular hole of radius 8.00

*asked on April 10, 2016* -
## Chemistry

A chemist ran the reaction and obtained 5.70 of ethyl butyrate. What was the percent yield? How do I solve this problem?

*asked on December 6, 2011* -
## Math

You are the financial manager at Best Buy where a certain TV set is normally sold for $2,500 and the full purchase price is financed for 30 monthly payments at 24% per year compounded monthly, with the payments made at the end of each month. During

*asked on October 22, 2014* -
## Math

At a summer camp, one boy and one girl will be selected to lead the weekly activities. If there are 130 boys and 145 girls at the camp, how many different 2 person combinations of 1 boy and 1 girl are possible?

*asked on February 5, 2013* -
## chemistry

1)when benzoic acid and quinine is dissolved in CH2Cl2 and added 2M NaOH, what is the organic layer and what is the aqueous layer? a)and by adding another 2M NaoH to the organic layer, what is the new aqueous layer and organic layer? b)from (1), if we add

*asked on March 31, 2009* -
## Math

Gabriella is x years old.Her sister Felicia,is six years old than she is.Their mother is twice as old as Felicia.Their aunt,Tanya,is x years older than their mother.Write and simplify an expression that represents Tanya's age in years.

*asked on January 14, 2015* -
## Physics

How many times will the incident beam shown in Figure P25.3 (x = 1.90 m, y = 1.30 m) be reflected by each of the parallel mirrors? mirror on the right

*asked on November 6, 2008* -
## Statistics

Suppose x is a uniform random variable with c=10 and d=90. Find the probability that a randomly selected observation exceeds26.

*asked on November 16, 2010* -
## math

A golf ball is hit off the ground at an angle of pie/6 and it travels 400 ft. How long was the golf ball in the air?

*asked on May 6, 2010* -
## statistics

The average math SAT score is 500 with a standard deviation of 100. A particular high school claims that its students have unusually high math SAT scores. A random sample of 50 students from this school was selected, and the mean math SAT score was 530. Is

*asked on November 23, 2010* -
## Maths

Construct a parallelogram ABCD, where AB=7cm ,AC =9cm and /_A = 75°

*asked on February 5, 2017* -
## chemistry

An alternative approach to bomb calorimetry is toestablish the heat capacity of the calorimeter, exclusive of the water it contains. The heat absorbed by the water and by the rest of the calorimeter must be calculated separately and then added together. A

*asked on October 11, 2014* -
## Math

You have borrowed $135,000 from the bank today. You are required to repay this money over the next six years by making monthly payments of $2,215.10 at the end of each month. What is the quoted interest rate for the loan (with monthly compounding)? Please

*asked on October 22, 2014* -
## Chemistry

Phosphoric acid, H3PO4(aq), is a triprotic acid, meaning that one molecule of the acid has three acidic protons. Estimate the pH, and the concentrations of all species in a 0.100 M phosphoric acid solution. pKa1 = 2.16 pKa2 = 7.21 pKa3 = 12.32 [H3PO4] = ?

*asked on February 26, 2013* -
## math

there are 7 red balloons and 4 fewer blue ballons. use cube trains to model the set of ballons.

*asked on November 18, 2011* -
## Pre-Calc with Analytic Geometry

Function : y=cot(2x+pi) 1)determine the interval for the principal cycle. (Type this answer in interval notation) 2)Then for the principal cycle, determine the equations of the vertical asymptotes. 3)find the coordinates of the center point. 4)

*asked on August 4, 2016* -
## Chemistry

2 NaN3(s) = 2 Na(l) + 3 N2(g) How many grams of NaN3 are needed to produce 20L of N2(g) at 303K and 776mmHg?

*asked on September 24, 2013* -
## Business math

A store had 896 swimsuits that were marked to sell at $46.99. Each suit was marked down $15.90. Find the reduced price using the formula M = S – N, where M is the markdown, S is the original selling price, and N is the reduced price.

*asked on September 8, 2013* -
## Math

123 Inc has a profit margin of 15%. Its total asset turnover ratio is 2 and its dividend payout ratio is 60%. What is the company's internal growth rate? Please show steps

*asked on October 23, 2014* -
## Math

Kosuke wrote a mathematics contest consistingof 25 multiple choice questions, the scoring system gave 6 points for a correct answer, 2 points for not answering, and 1 point for an incorrect answer.Kosuke got x correct and left y unanswered questions a)

*asked on October 9, 2011* -
## Chemistry

Can someone help me balance this equation? MnO4(¨C) + H(+) + C2O4(2¨C)--> Mn(2+) + H2O + CO2 Sure but tell us what you don't understand about it. You need to learn how to do them yourself. Tell me what you don't understand, in detail, and I can help you

*asked on April 30, 2007* -
## Language arts

How should the United States government have behaved in dealing with the disputes between the Cherokees and the white settlers?

*asked on October 23, 2014* -
## science

A car is moving at a speed of 72 km/hr. The radius of its wheels is 0.25m. If the wheels are stopped in 20 rotation by applying brakes, then angular retardation produced by the brakes is:

*asked on November 29, 2016* -
## Math

An airline believes that the probability of a passenger being a no-show on a morning flight is 12%. If the airline overbooks a 300 seat morning flight by selling 350 tickets how many empty seats should the airline expect to have on the flight

*asked on September 7, 2016* -
## math

On a map of the Fox River, 1 centimeter represents 6.5 kilometers. If a trail by the river is actually 26.65 kilometers long, what is the length of the river on the map?

*asked on November 19, 2013* -
## Ap chemistry

if a 84g sample of thorium decays with a 10 minute half life, how much would the sample weight in a half hour?

*asked on February 27, 2018* -
## programming

for a list of numbers entered by the user and terminated by 0, find the sum of the positive numbers and the negative numbers

*asked on May 16, 2010* -
## Chemisty

If ten drops of 0.3 M HCl are mixed with ten drops of 0.3 M Na2S2O3, what will be the concentration of each chemical in the mixture? Please help, i am pretty sure that the concentration should be 0.3 M but i am not sure if i am supposed to do somthing with

*asked on January 7, 2009* -
## Science

Why is the formation of iron hydroxide, Fe(OH)2, from Fe2+ and OH- not considered an oxidation-reduction reaction?

*asked on March 11, 2008* -
## Life orientation

3 human rights violations or discrimination and explain in an introductory paragraph why you choose the specific human rights violations or discrimination

*asked on May 15, 2016* -
## Physics

A 0.500 kg particle moves in a circle of R=0.0150 m at constant speed. The time for 20 complete revolutions is 31.7 s. What is the period T of the motion? What is the speed of the particle? What is the centripetal acceleration of the particle? What is the

*asked on March 5, 2013* -
## Calc.

Find the minimum cost of producing 20,000 units of a product, where x is the number of units of labor (at$48 per unit) and y is the number of units of capital (at $36 per unit). P(x,y)=100x^.6y^.4

*asked on December 9, 2010* -
## science(physics)

A powerful motorcycle can accelerate from rest to 28m/s in only 4 second . a.what is its average acceleration? b.how far does it travel in that time

*asked on September 21, 2016* -
## Algebra 1- 8th Grade

What is the relationship between the x-intercepts of a parabola and its vertex's x-coordinate?

*asked on March 29, 2009* -
## Math

You have the following data for the Fosberg Winery. What is Fosberg's return on assets (ROA)? Return on equity = 15%; Earnings before taxes = $30,000; Total asset turnover = 0.80; Profit margin = 4.5%; Tax rate = 35%.

*asked on October 23, 2014* -
## Math

A population grows exponentially at a rate of 2.6% per year. How long will it take for the population to triple?

*asked on December 14, 2016* -
## Math

Pey Soon has taken out a 20-year, $150,000 mortgage with monthly payments (made at the end of each month) at a stated mortgage rate of 6.8% per year compounded semi-annually. If she makes each payment on time, what will be the mortgage principal remaining

*asked on October 23, 2014* -
## U.S History

help please What challenges did the United States face after the overthrow of saddam Hussein? Please help me ASAP thank you

*asked on December 12, 2011* -
## british literature

review the metrical feet box on page 35 in your study guis and the model of scanned poem in your textbook page 42. then ,scan the following sonnet 73. mark the syllables, separate the feet with shorts vertical lines, and indicate the rhythem scheme that

*asked on July 18, 2011* -
## Physics

A daredevil plans to bungee jump from a balloon 64.0 m above a carnival midway. He will use a uniform elastic cord, tied to a harness around his body, to stop his fall at a point 10.0 m above the ground. Model his body as a particle and the cord as having

*asked on February 29, 2008* -
## Geometry

Find the measure of each side of equilateral triagnle RST with RS = 2x + 2, ST = 3x, and TR + 5x -4.

*asked on November 9, 2010* -
## 8th Algebra

What are some real-life examples of exponential growth and decay?

*asked on April 20, 2009* -
## Chemistry

An 8.07g sample of impure Ag2O decomposes into solid silver and O2(g). If 395mL O2 is collected over water at 25C and 749.2mmHg barometric pressure, then what is the percent by mass of AgO2 in the sample? The vapor pressure of water at 25C is 23.8mmHg.

*asked on September 27, 2013* -
## chemistry

The escape velocity from earth is 2.5 x10^4 miles per hour. What is this speed in m/s? (1 mile 1609 m)

*asked on April 14, 2013* -
## Math

On friday, a computer was priced at $800. on the following wednesday, the price was reduced by 15%. On the following friday, the price was further reduced by 20%. what percent of the original price was the final price ?

*asked on February 5, 2013* -
## Chemistry- rate laws

CH3CHO decomposes into methane gas and carbon monoxide gas. This is a 2nd order reaction. Rate of decomposition at 140 degrees Celsius is .10M/s when the concentration of CH3CHO is .010. What is the rate of the reaction when the concentration of CH3CHO is

*asked on September 18, 2012* -
## Math

A bucket that weighs 3.2 pounds and a rope of negligible weight are used to draw water from a well that is 82 feet deep. The bucket is filled with 42 pounds of water and is pulled up at a rate of 2.3 feet per second, but water leaks out of a hole in the

*asked on February 6, 2011* -
## statistic

The amount of time a bank teller spends with each customer has a population mean of 3.10 minutes and standard deviation of 0.40 minute. If a random sample of 16 customers is selected, a) what assumption must be made in order to solve parts (b) and (c)? b)

*asked on April 7, 2012* -
## Calc.

a bomb is dropped drom an airplane at an altitude of 14,400 feet how long would it take to reach the ground? (because the motion of the plane, the fall will not be vertical, but the time will be the same as that for a vertical fall.) the plane is moving at

*asked on December 9, 2009* -
## Ict

Uses Of Ict In Timing And Control

*asked on April 26, 2019* -
## Trig

A plane has a speed of 250mph and flies with a bearing of N35degE. The wind is blowing from the west at 25 mph with a heading of due east. What is the actual speed and heading of the plane? Round to one decimal place.

*asked on April 21, 2013* -
## Science

Write correct formulas for the products in these combustion reactions.C6H6 + O2=

*asked on July 29, 2017* -
## chemistry

I need help with this lab. Write the equation for the decomposition of the hydrate, CuSO4*XH2O. Mass of crucible and hydrate: 93.000g Mass of crucible and pure salt: 91.196g I need to calculate the following: 1. mass of water in hydrate sample(g) 2. number

*asked on November 8, 2012* -
## College Algebra

A coin jar contains nickels, dimes and quarters. There are 46 coins in all. There are 11 more nickels than quarters. The value of the dimes is $1.00 less than the value of the quarters. How many coins of each type are in the jar?

*asked on April 26, 2011* -
## Global History

How were European nations able to dominate non-European areas?

*asked on February 16, 2010* -
## Algebra

1) Two cars leave town at the same time going in opposite directions. One travels 44 mi/h and the other travels 55 mi/h. In how many hours will they be 297 miles apart? 2) Two cars leave town at the same time going the same direction on the same road. One

*asked on March 7, 2009* -
## physics

A dart leaves the barrel of a blowgun at a speed v. The length of the blowgun barrel is L. Assume that the acceleration of the dart in the barrel is uniform. If the darts exit speed is 17 m/s and the length of the blowgun is 1.10 m, find the time the dart

*asked on October 11, 2015* -
## Math

a chemist has an 18% acid solution and a 36% acid solution. How many liters of each of these solutions should be mixed together to make 24L of 30% solution? Enter two numbers separated by a comma

*asked on March 1, 2012* -
## global studies

the four major kinds of plant life in the United states are:tundra,grassland,desert scrub, and? Thank you for using the Jiskha Homework Help Forum. What about forests and flowering plants? P.S. Although the following link may not answer your question, it

*asked on March 19, 2007* -
## Chemistry

Complete and balance the following (CH3)2NH(aq)+CH3COOH(aq)→ CH3CH2NH2(aq)+HBr(aq)→ CH3NH2(aq)+HCOOH(aq)→

*asked on May 27, 2014* -
## math/algebra

Elena bought 49 packs of red balloons, 66 packs of blue balloons, and 35 packs of yellow balloons. Each contained 12 balloons. She mixed them up and gave away some balloons. She then repacked the balance into packs of 25. QUESTION A: How many balloons were

*asked on October 30, 2018* -
## stat

In a random sample of 200 registered voters, 150 indicated they are Democrats. Develop a 99% confidence interval for the proportion of registered voters in the population who are Democrats.

*asked on April 17, 2017* -
## Math

Given the following information: current assets = $400; fixed assets = $500; accounts payable = $100; notes payable = $45; long-term debt = $455; equity = $300; sales = $450; costs = $400; tax rate = 34%. Suppose that current assets, costs, and accounts

*asked on October 23, 2014* -
## Chemistry

The nuclide 38cl decays by beta emission with a half life of 40min. A sample of .40 m of H38cl is placed in a 6.24 liter container. After 80 min the pressure is 1650 mmHg. What is temperature of container? I have tried calculating the decay rate of the

*asked on July 21, 2013* -
## algebra/logs

I don't understand this problem: (1/2)n = 0.015625 n log 0.5 = log 0.015625 n = log 0.5 / log 0.015625 n = 6 When I plug log .5 into the calculator it gives .3010 and when I plug .15625 to the calculator it is -1.806 and that would be -.3010/-1.806 =.1666.

*asked on August 2, 2012* -
## Chemistry

I don't know if I should be posting this on a new session or just the old one; I asked it yesterday and I have not seen a reply I have: the half life of U-238 is 4.5 x 10^9 yr. A sample of rock of mass 1.6g produces 29 disintegrations per second. find

*asked on June 18, 2012* -
## science

a 5.o kg book is sitting on a table. which describes the forces acting on the book? a)there are no forces acting on the book b)the net force on the book is zero Since the weight of the book is cancelled out by the support of the table. does that mean a)

*asked on August 7, 2010* -
## calculus

a circle of radius 1 rolls around the outside of a circle of radius 2 without slipping. the curve traced by a point on the circumfarence of the smaller circle is callled an epicycloid. use the angle theta to find a set of parametric equations for this

*asked on May 12, 2010* -
## PHYSICS

A LIVING ROOM HAS DIMENSIONS 3.5M X4.2M X4.2M .WHAT IS THE PRESSURE EXERTED BY THE AIR ON THE FLOOR IN THE ROOM

*asked on March 2, 2019* -
## Statistics

The table to the right lists probabilities for the corresponding numbers of girls in three births. What is the random variable, what are its possible values, and are its values numerical? Number of girls x P(x) 0 0.125 1 0.375 2 0.375 3 0.125

*asked on March 2, 2017* -
## physics

An apple falls from a tree and hits the ground 10.9 m below. With what speed will it hit the ground? The acceleration of gravity is 9.8 m/s 2 . Answer in units of m/s.

*asked on October 8, 2017* -
## Chemistry Check

Determine the missing values of deltaH in the diagram shown below ^ | ^ N2O3(g) + 1/2 O2(g) (Enthalpy)| | ^ | | deltaH= +16.02 | | | | | | 2 NO2(g) | | | ^ | |deltaH=? | | | | | | deltaH=?| | | | | | | | N2(g)+202(g) | Answer: Delta H for the right= 66.36

*asked on October 18, 2014* -
## CHEMISTRY

A voltaic cell is constructed that uses the following reaction and operates at 298 K: 2 Al(s) + 3 Mn^2+(aq) 2 Al^3+(aq) + 3 Mn(s). What is the potential, E, of this cell when [Mn^2+] = 0.10 M and [Al^3+] = 1.5 M?

*asked on March 16, 2014* -
## veterinary medicine

A pet owner accidentally applies 2.5 ml of a dog flea product containing 45% permethrin to a 15 lb cat. What is the dosage this cat received?

*asked on July 12, 2010* -
## calculus

a circle of radius 1 rolls around the outside of a circle of radius 2 without slipping. the curve traced by a point on the circumfarence of the smaller circle is callled an epicycloid. use the angle theta to find a set of parametric equations for this

*asked on May 11, 2010* -
## College Algebra

A sailboat has a triangular sail with an area of 20 square feet. The height of the sail is 6 feet more than the length of the base of the sail. Find the height of the sail.

*asked on January 18, 2016* -
## Healthcare Statistics

As a data collection specialist at the National Institutes of Health (NIH), you have been involved in a research study conducted over the past year. The study found that liver cancer rates per 100,000 males among cigarette smokers to nonsnmokers, in a

*asked on March 8, 2015* -
## earth

Why is the Earth's atmosphere rich in oxygen and poor in carbon dioxide?

*asked on August 18, 2011*