# Raj

Popular questions and responses by Raj-
## Chemistry

Draw the Lewis structures for BrO3- and ClO4- and indicate their correct number of additional resonance structures. I'm a little confused about this. For example, I've got the correct original form of BrO3- down. Where all 3 O atoms are single bonded to

*asked on September 28, 2008* -
## Math, Series

Given that 1/(y-x), 1/2y, and 1/y-z are consecutive terms of an arithmetic progression, prove that x,y, and z are consecutive terms of a geometric progression.

*asked on March 15, 2017* -
## science(physics)

A bullet of mass 100g moving with20m/sec .Strikes a wooden plank and peretrates up to 20cm.Calculate the resistance offered by the wooden plank.

*asked on July 27, 2016* -
## chemistry

When excess solid Mg(OH)2 is shaken with 1.00 L of 1.2 M NH4Cl solution, the resulting saturated solution has pH = 9.30. Calculate the Ksp of Mg(OH)2 I am not sure where to even begin on this problem.

*asked on March 21, 2010* -
## rd. math

Pl find out hcf using division method 180,252,576

*asked on July 29, 2015* -
## Maths

The point P is reflection of (-2,10) on the line 4x-3y=12. Find the coordinates of P.

*asked on August 29, 2019* -
## Calculus

A rectangular sheet of metal measures 50cm by 40cm .Equal squares of side x cm are cut from each corner and discarded.The sheet is then folded up to make a tray of depth x cm.what is the domain of possible values of x.Find the values of x which maximise

*asked on December 3, 2019* -
## Calculus

5. Once Tony reached the hospital, he is carried on a stretcher through the corridors to the emergency area. Two corridors meet at right angles and are 2 m and 3 m wide respectively. π is the angle marked on the given figure. AB is the stretcher which

*asked on July 22, 2020* -
## Maths

The heights of boys at a particular age follow a normal distribution with mean 150.3 and standard deviation 5cm. Find the probability that the height of a boy picked at random from the age group is i.more than 10 cm from the mean height.

*asked on February 12, 2020* -
## Maths

Nine cards are numbered 1, 2, 2, 3, 3, 4, 6, 6, 6.Three of the nine cards are chosen and placed in a line, making a 3-digit number. Find how many different numbers can be made in this way if the number is between 200 and 300. Tell me answer in terms of

*asked on March 24, 2020* -
## Chemistry

PartA: What volume of 10.0M NaOH is needed to prepare a buffer with a pH of 7.79 using 31.52 g of TrisHCl? TrisHCl is a weak base and the molecular weight is 157.67 g/mol. I found the solution, it is 6.67 milliliters. The main question is:Part B: "The

*asked on March 1, 2009* -
## Chemistry

What is the ionic strength of 0.2 M Na2HPO4 in a solution?

*asked on December 21, 2015* -
## math

Find the height of a cuboid whose volume is 168 cubic metre and the area of the base is 28 square metre. The length of a reservoir is 2.5m. It's width is 2 m and its height is 4 m. If it is half-filled with water, find the volume of the water in the

*asked on November 22, 2015* -
## Maths

1.Issam has 11 different CDs of which 6 are pop music , 3 are jazz and 2 are classical. Issam makes a selection of 2 pop music CDs, 2 jazz CDs and 1 classical CD. How many different selections can be made.Here the answer is 90 finalized by multiplying all.

*asked on October 6, 2019* -
## Maths

find the number of ways of choosing a school team of 5 pupils from 6 boys and 8 girls if 3 of the boys are cousins are either on the team or all not in the team.

*asked on August 20, 2019* -
## Maths

Functions f and g are defined by f(x)=4x-2k g(x)=9/(2-x) i.Find the values of k for which the equation fg(x)=x has two equal roots.

*asked on September 9, 2019* -
## Chemistry

Use the Bronsted-Lowry definitions to identify the two conjugate acid-base pairs in the following acid-base reaction: H20 + H20 H30^+ + OH^- Let's see what you think on this after the previous post. Just remember, the acid is the one that HAS the H and the

*asked on May 26, 2007* -
## Maths

On average 1 in 10 of the chocolates produced in a factory are mis-shapes.In a random sample of 1000 chocolates,find the probability that i) fewer than 80 are mis-shapes. π

*asked on February 18, 2020* -
## Physics

Define non-zero intercept?

*asked on August 26, 2019* -
## Maths

Pegs are to be placed in the four holes shown, one in each hole. The pegs come in different colours and pegs of the same colour are identical. Calculate how many different arrangements of coloured pegs in the four holes can be made using (i) 6 pegs, all of

*asked on August 22, 2019* -
## algebra

The fifth term of an A.P exceeds twice the second term by 1.The tenth term exceeds twice the fourth term by 3. Find:1.the first term. 2.the common difference. 3.the sum of first twenty five terms.

*asked on July 5, 2017* -
## math

Find two positive real numbers x and y such that they add to 120 and x^(2)y is as large as possible

*asked on November 21, 2015* -
## chemistry

You have to prepare a pH 5.00 buffer, and you have the following 0.10M solutions available: HCOOH, HCOONa, CH3COOH, CH3COONa, HCN, and NaCN. Which solutions would you use? HCOOH HCOONa CH3COOH CH3COONa HCN NaCN

*asked on March 23, 2015* -
## calculus

A cable runs along the wall from C to P at a cost of $3 per meter, and straight from P to M at a cost of $5 per meter. If M is 16 meters from the nearest point A on the wall where P lies, and A is 50 mters from C, find the distance from C to P such that

*asked on October 18, 2014* -
## Business Math

Aunt Sallyβs βNew Orleans Most Famous Pralinesβ sells pralines costing $1.10 each to make. If Aunt Sallyβs wants a 35% markup based on selling price and produces 45 pralines with an anticipated 15% spoilage, what should each praline be sold for?

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

Helen has some black tiles, some white tiles and some grey tiles. She places a single row of 8 tiles above her washbasin. Each tile she places is equally likely to be black, white or grey. Find the probability that there are no tiles of the same color next

*asked on April 1, 2020* -
## Maths

Four fair sided dice, each with faces marked 1,2,3,4,5,6, are thrown on 7 occasions.Find the probability that the numbers shown on the four dice add up to 5 on exactly one or two of the 7 occasions.

*asked on November 17, 2019* -
## Maths

A choir consists of 13 sapranos,12 altos,6 tenors, and 7 basses.A group consisting of 10 sapranos, 9 altos, 4 tenors and 7 basses is to be chosen from the choir. Q.The 4 tenors and 4 basses stand in a single line with all the tenors next to each other and

*asked on August 18, 2019* -
## Maths

Cartons of milk from a particular supermarket are advertised as containing 1 litre of milk,but in fact the volume of the milk in a cartoon is normally distributed with mean 1012 ml and standard deviation 5 ml. i.Find the probability that exactly 3 cartons

*asked on February 13, 2020* -
## Maths

A squad of 20 boys, which includes 2 sets of twins , is available for selection for a cricket team of 11 players. Calculate the number of different teams that can be selected if one set of twins is selected but neither twin from the other set is selected.

*asked on October 7, 2019* -
## Chemsitry

The equilibrium between three substances, a, B and c is shown below. A(g) + B(g) C(g) Initially there were 0.1 mol of a and 0.2 mol of B in the reaction mixture. a and B reacted together to produce an equilibrium mixture containing 0.04 mol of c. The total

*asked on December 7, 2019* -
## Math

A small aeroplane has 14 seats for passengers. The seats are arranged in 4 rows of 3 seats and a back row of 2 seats . 12 passengers board the aeroplane. (i) How many possible seating arrangements are there for the 12 passengers? Give your answer correct

*asked on August 22, 2019* -
## Maths

A farmer finds that the weights of sheep on his farm have a normal distribution with mean 66.4 kg and standard deviation 5.6 kg. 250 sheep are chosen at random. Estimate the number of sheep which have a weight of between 70 kg and 72.5 kg. Why there is no

*asked on April 5, 2020* -
## statistics

2. At a local university, a sample of 49 evening students was selected in order to determine whether the average age of the evening students is significantly different from 21. The average age of the students in the sample was 23 years. The population

*asked on May 24, 2016* -
## Maths

The diameters of bolts produced by a particular machine follow a normal distribution with mean 1.34cm and standard deviation 0.04cm.A bolt is rejected if its diameter is less than 1.24 or more than 1.40cm.i.Find the percentage of bolts which are accepted.

*asked on February 17, 2020* -
## Maths

An examination consists of a section A, containing 10 short questions, and a section B, containing 5 long questions. Candidates are required to answer 6 questions from section A and 3 questions from section B.Find the number of different selections of

*asked on October 6, 2019* -
## Maths

Find the area of quadrilateral ABCD having vertices A(-1,5) , B(-2,6) , C(4,10) and D(3,5)

*asked on August 28, 2019* -
## Math

A body of 6 kg rest in limiting equilibrium onan inclined plane whose slope is 30Β° the plane is raised to a slope of 60 degree the forcw in kg weight around the plane required to support it is

*asked on July 19, 2017* -
## Physics

A 14 g bullet is fired into the bob of a ballistic pendulum of mass 1.6 kg. When the bob is at its maximum height, the strings make an angle of 60Β° with the vertical. The length of the pendulum is 2.3 m. Find the speed of the bullet. ?m/s Any help is

*asked on July 21, 2015* -
## Maths

A farmer cuts hazel twigs to make into beam poles to sell at the market.He says that the sticks are each 240cm long but in fact the lengths of the stick are normally distrinuted such that 55% of the sticks are longer than 240cm and 10% are longer than

*asked on February 17, 2020* -
## Maths

The height , in meters, of 500 people are normally distributed with standard deviation 0.080.Given that the heights of 129 of these people are greater than the mean height, but less than 1.806m,estimate the mean height.

*asked on February 16, 2020* -
## Maths

Cartons of milk from a particular supermarket are advertised as containing 1 litre of milk,but in fact the volume of the milk in a cartoon is normally distributed with mean 1012 ml and standard deviation 5 ml. i.Find the probability that exactly 3 cartons

*asked on February 13, 2020* -
## Chemistry

Ferrochrome is an alloy of iron and chromium. Ferrochrome can be dissolved in dilute sulfuric acid to produce a mixture of FeSO4 and Cr2(SO4)3. The FeSO4 reacts with K2Cr2O7 in acid solution according to the following equation. 14H+ + 6Fe2+ + Cr2O7 2β

*asked on November 4, 2019* -
## physics

The figure below shows a plot of potential energy U versus position x of a 1.30 kg particle that can travel only along an x axis. (Nonconservative forces are not involved.) In the graphs, the potential energies are U1 = 10 J, U2 = 35 J, and U3 = 50 J.

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

Use a simple area formula from geometry to find the area under function A(x) that gives the area under the function f(x) = 9 on the interval [2, x].

*asked on December 19, 2010* -
## Physucs

A clerk pushes a filing cabinet of mass 22.0 kg accross the floor by exerting a horizontal force of magnitude 98 N. The magnitude of the force of kinetic friction acting on the cabinet is 87 N. The cabinet starts from rest. Use the law of conservation of

*asked on November 30, 2006* -
## Maths

A farmer finds that the weights of sheep on his farm have a normal distribution with mean 66.4 kg and standard deviation 5.6 kg. 250 sheep are chosen at random. Estimate the number of sheep which have a weight of between 70 kg and 72.5 kg.

*asked on April 5, 2020* -
## Maths

Nine cards are numbered 1, 2, 2, 3, 3, 4, 6, 6, 6.Three of the nine cards are chosen and placed in a line, making a 3-digit number. Find how many different numbers can be made in this way if the number is between 200 and 300. π 0 π 0 π 23 asked by

*asked on March 23, 2020* -
## Maths

Find the value of cos(-225).

*asked on February 29, 2020* -
## Maths

On average 1 in 10 of the chocolates produced in a factory are mis-shapes.In a random sample of 1000 chocolates,find the probability that i) fewer than 80 are mis-shapes. Reply!

*asked on February 18, 2020* -
## Maths

Cartons of milk from a particular supermarket are advertised as containing 1 litre of milk,but in fact the volume of the milk in a cartoon is normally distributed with mean 1012 ml and standard deviation 5 ml. i.Find the probability that exactly 3 cartons

*asked on February 13, 2020* -
## Chemistry

Gaseous hydrogen and gaseous iodine react together to form hydrogen iodide. H2 + I2 2HI a The graph shows how the amount of hydrogen iodide varies with time in a 1.00 dm3 container. The initial amounts of hydrogen and iodine were 1.00 mol H2 and 1.00 mol

*asked on December 7, 2019* -
## Calculus

A open cylindrical wastepaper bin, of radius r cm and volume V cm^3, is to have a surface area of 5000cm^3. a.Show that V=1/2 *r(5000-pir^2) b.Calculate the maximum possible capacity of the bin.

*asked on December 2, 2019* -
## Maths

A class test consists of 4 Algebra questions,W ,X,Y and Z, and 4 Geometry questions,A,B,C and D.The teacher decides that the questions should be arranged in two sections.Algebra followed by Geometry,with questions in each section arranged in a random order

*asked on October 7, 2019* -
## Maths

a/A class test consists of 4 Algebra questions,W ,X,Y and Z, and 3 Geometry questions,A,B,C and D.The teacher decides that the questions should be arranged in two sections.Algebra followed by Geometry,with questions in each section arranged in a random

*asked on October 7, 2019* -
## Maths

There are twenty numbered balls in a bag.Two of the balls are numbered 0,six are numbered 1, five are numbered 2 and seven are numbered 3. Four of these balls are chosen at random,without replacement.Calculate the different number of ways this can be done

*asked on October 6, 2019* -
## Maths

There are twenty numbered balls in a bag.Two of the balls are numbered 0,six are numbered 1, five are numbered 2 and seven are numbered 3. Four of these balls are chosen at random,without replacement.Calculate the different number of ways this can be done

*asked on October 6, 2019* -
## Maths

The curve y = (x^2-4) is translated by(2 0). Write down an equation for the translated graph.Explain

*asked on October 2, 2019* -
## Maths

Permutation and combination A diagonal of a polygon is defined to be a line joining any two non-adjacent vertices. 1.Show that the number of diagonals in a 5 sided polygon is(5 2) -5. 2.how many diagonals are their in 6 sided polygon? 3.Show that the

*asked on August 19, 2019* -
## Maths

How many different selections of four letters from the 12 letters of the word REFRIGERATOR contain no Rs and two Es?

*asked on August 18, 2019* -
## maths

a man gives 40% of his money to his children and 20% of the remaining to a trust. if he is still left with rs.9600.what did he originally have?

*asked on November 18, 2016* -
## maths

At an election, a candidate secures 40% of the total votes but is defeated by the only other candidate by 300 votes .find out the total number of votes polled.

*asked on February 4, 2016* -
## math

An electric pole touches the ground due to bending in a wind. It is found that standing part of pole is equal to the distance of end touching the ground. If the end touching the ground from the pole is at distance 4 m, what was the length of pole before

*asked on April 27, 2013* -
## finance

Fashion Distributors Incorporated currently sells on terms of 2/10, net 30, with bad debt losses at 1% of gross sales. Of the 99% of the customers that pay, 50% take the discount and pay on Day l0; the remaining 50% pay on Day 30 (average collection period

*asked on April 8, 2013* -
## physics

to find the depth of the water surface in a well, a person drops a stone from the top of the well and simultaneously starts a stopwatch. The watch is stopped when the splash is heard, giving a reading of 3.65 s. The speed of sound is 340 m/s. Find the

*asked on September 12, 2012* -
## Chemistry

Given the weight of phenacetin and its percentage yield...how would I calculate its melting point?

*asked on February 6, 2008* -
## Chemistry

If I am given a molecular hydrocarbon structure, how would I be able to tell how sp3 hybridized carbons it possesses? Like my current question asks How many sp3-hydridized carbon atoms does 11-cis-retinal possess?

*asked on January 27, 2008* -
## Chemistry

In a thermochemistry experiment the reaction of 0.0857 g of an unknown metal and an excess of 4.0 M HCl resulted in a 0.210 mL decrease in the volume of an ice/water mixture. Calculate the enthalpy of this reaction per 1 g of metal reacted. Needed data:

*asked on December 1, 2007* -
## Chemistry

When given a chemical reaction, how would I know whether a reaction is endo or exothermic and whether work is done on the system or by the system. Without using any calculations. So I have a couple reactions which I have to use chemical reasoning to to

*asked on November 20, 2007* -
## Chemistry

Classify the following as: Weak or strong acid, weak or strong base, salt (from weak/strong acid and base). If appropriate, split the formula into its component ions. HNO3 So far, all I have is: HNO3 + H2O -> NO3^- + H3O^+ And I know HNO3 is a strong acid.

*asked on May 26, 2007* -
## Chemistry

What is the empirical distinction between emission and absorption spectra? In general terms, how did Niels Bohr explain each of these spectra? In general terms, emission spectra are obtained when the electron is at a high energy level and it falls to a

*asked on February 7, 2007* -
## Chemistry

What is the chemical equation for the combustion reaction between methanol and air? CH4 + O2 ==> CO2 + H2O. All hydrocarbons produce CO2 and H2O when they are combusted in air. The above equation isn't balanced. I assume you can do that? If not, ask OR

*asked on January 18, 2007* -
## Data Management

List all permutations of the elements of the set {+, -, *) List all subsets (combinations) of the elements of the set {+, -, *)

*asked on December 20, 2006* -
## Maths

Explain what you've used and why? There are a large number of students in Luttley College. 60% of the students are boys. Students can choose exactly one of Games, Drama or Music on Friday afternoons. It is found that 75% of the boys choose Games, 10% of

*asked on April 2, 2020* -
## Maths

The first 2 values in ascending power of x in the expansion of (1+x) (2-x/4)^n are p+qx^2.Find the values of n,p,q. π 0 π 0 π 31 asked by Raj today at 12:10pm (2 - x/4)^n = 2^n - n*2^(n-1) * (x/4) + n(n-1)/2 * 2^(n-2) * (x/4)^2 - ... = 2^n -

*asked on March 18, 2020* -
## Science

A graph is false zero graph.What does it mean?

*asked on March 15, 2020* -
## Maths

How to draw graph of y=2cos(x+60) for 0

*asked on March 15, 2020* -
## Maths

How to draw graph of y=2cos(x+60).

*asked on March 15, 2020* -
## Maths

Given that sinA=2/5 and that A is obtuse,find the value of cosA.

*asked on March 1, 2020* -
## Maths

A machine is used to fill cans of soup with nominal volume of 0.5 litres.The quantity of soup actually delivered is normally distributed with mean m litres and standard deviation s litres.It is required that no more than 1% of cans should contain less than

*asked on February 17, 2020* -
## Maths

In a normal distribution, 4% of the distribution is less than 53 and 97% of the distribution is less than 65.i.Find the mean and standard deviation of the distribution. ii.Find the interquartile range of the distribution.

*asked on February 17, 2020* -
## Maths

The weights of vegetable marrows supplied to retailers by a wholesaler have a normal distribution with mean 1.5 kg and standard deviation 0.02 kg.The wholesaler supplies three sizes of marrow- Size 1 under 1.48 kg Size 2 from 1.48 to 1.53 kg Size 3 over

*asked on February 13, 2020* -
## Maths

The number of hours of life of a certain type of torch battery is normally distributed with mean 150 and standard deviation 12. In a quality control test two batteries are chosen at random from a batch.If both batteries have a life less than 120 hours, the

*asked on February 13, 2020* -
## Physics

A battery, an ammeter and a variable resistor connected in series.A voltmeter is connected across fixed resisitor.The value of variable resistor is reduced.What would happen to ammeter and voltmeter reading?

*asked on February 9, 2020* -
## Programming

WAP to check if number is in array using VBA. Dim a(4), n, no As Integer Console.WriteLine("Enter a no.") For n = 0 To 4 a(n) = Console.ReadLine Next Console.WriteLine("Enter a no. to search") no = Console.ReadLine For n = 0 To 4 If a(n) = no Then

*asked on January 21, 2020* -
## Programming

Write a VB.NET program code to find second largest element in an array.

*asked on January 12, 2020* -
## Programming

Can somebody give me clue where I can get programming help? π 0 π 0 π 18 asked by Raj today at 8:52am google search?? π 0 π 0 posted by Ms Pi 3.14159265358979323 today at 9:50am What language are you programming in? π 0 π 1 posted by

*asked on January 12, 2020* -
## Programming

Can somebody give me clue where I can get programming help?

*asked on January 12, 2020* -
## Maths

Find the value of cos2x=3/4.Find the two values of x. 0pi(180)

*asked on January 12, 2020* -
## Maths

Find the value of cos2x=3/4.Find the two values of x.

*asked on January 12, 2020* -
## Programming

Write a VB.NET program to check if the sum of all the 10's in the array is exactly 30. Return false if the condition does not satisfy, otherwise true.

*asked on December 29, 2019* -
## Calculus

There is a diagram with the curve y=(2x-5)^4.The point P has coordinates (4,81) and the tangent to the curve at P meets the x-axis at Q.Find the area of the region enclosed between curve ,PQ and the x-axis.

*asked on December 21, 2019* -
## Calculus

Evaluate integral 3x(X-2) from 0 to 2 and comment on your answer.

*asked on December 21, 2019* -
## Maths

A certain disease is present in 1 in 200 of the population.In a mass screening program quick test for the disease is used, but the test is not totally reliable. For someone who does have the disease there is a probability of 0.9 that the test will prove

*asked on November 11, 2019* -
## Maths

A six side dice is biased so that, when it is thrown, the probability of obtaining a score of 6 is 5/9 and of obtaining scores of 1 is 1/9.The probabilities of obtaining scores of 2,3,4,5 are equal.The dice is thrown twice.Calculate the probability that

*asked on November 11, 2019* -
## Maths

aA class test consists of 4 Algebra questions,W ,X,Y and Z, and 3 Geometry questions,A,B,C and D.The teacher decides that the questions should be arranged in two sections.Algebra followed by Geometry,with questions in each section arranged in a random

*asked on October 7, 2019* -
## Maths

A squad of 20 boys, which includes 2 sets of twins , is available for selection for a cricket team of 11 players. Calculate the number of different teams that can be selected if one set of twins is selected but neither twin from the other set is selected.

*asked on October 7, 2019* -
## Maths

Point A having coordinates (3,-7) lies on the curve y=f(X). State the coordinates of A when y=f(X) is transformed to y=f(2x-7)+1. The answer is (5,-6).But I didn't get 5.

*asked on October 6, 2019* -
## Maths

In a sector COD of a circle, centre O , in which angle COD =4/3 radians. The points A and B lie on the OD and OC respectively, and AB is an arc of a circle, centre O, of radius 7cm. Given that the area of the shaded region ABCD is 48cm^2. Find the

*asked on September 20, 2019* -
## Maths

f(x)-x^2-4x+k for domain x>=p State the smallest value of p for which f is one-one.

*asked on September 9, 2019*