# Sam

Popular questions and responses by Sam-
## Maths

We have Rs.100/-.If we spend Rs.100/-and balance is Rs.102/-,show how is Rs.2/-extra Spent Balance Day 1 Rs 40 Rs 60 Day 2 Rs 30 Rs 30 Day 3 Rs 18 Rs 12 Day 4 Rs 12 Rs 00 -------- -------- Total Rs 100 Rs102......?

*asked on February 28, 2016* -
## Algebra

Three quarters are tossed and a tail appears on at least one of them. What is the probability that at least one head appears? Express as a common fraction.

*asked on April 14, 2011* -
## science

a hydrauli press has a ram of 30 cm diameter and plunger of 4.5cm diameter. find the the weight lifted by the hydraulic press when the force applied at the plunger is 500N

*asked on August 22, 2017* -
## English Grammar

For greetings, is it "Haven't talk to you for a while" or "Haven't talked to you for a while" past tense or not:=?

*asked on November 14, 2008* -
## Math

If 5 fishermen catch 5 fish in 5 minutes, how many minutes will it take 50 fishermen to catch 50 fish? If 5 fishermen catch 5 fish in 5 minutes, then the average time it takes each fisherman is 5 minutes to catch one fish. It will take 50 fishermen 5

*asked on September 19, 2006* -
## math

32.17Grams rounded to the nearest gram

*asked on May 21, 2017* -
## Math Important!

Ozzie's Mother bought an assortment of greeting cards while she was at the bookstore. She bought twice as many birthday cards as anniversary cards. She bought 2 fewer anniversary cards than general greetings cards, but 2 more anniversary cards than get

*asked on July 30, 2015* -
## Statistics / Math

If a student is chosen at random, find the probability of getting someone who is a man or a non-smoker. Round your answer to three decimal places. non regular heavy total man 135 64 5 204 women 187 21 9 217 total 322 85 14 421 Answer in decimal (round to

*asked on February 26, 2008* -
## Physics

While working on her bike, Amanita turns it upside down and gives the front wheel a counterclockwise spin. It spins at approximately constant speed for a few seconds. During this portion of the motion, she records the x and y positions and velocities, as

*asked on August 19, 2012* -
## calculas

Use left and right endpoints and the given number of rectangles to find two approximations of the area of the region between the graph of the function and the x-axis over the given interval. (Round your answers to four decimal places.) g(x) = 7 sin x, [0,

*asked on May 7, 2016* -
## Statistics

The mean cost of domestic airfares in the United States rose to an all-time high of $385 per ticket. Airfares were based on the total ticket value, which consisted of the price charged by the airlines plus any additional taxes and fees. Assume domestic

*asked on June 11, 2014* -
## Pre-cal

The equation of the line joining the complex numbers -5 + 4i and 7 + 2i can be expressed in the form az + b*overline{z} = 38 for some complex numbers a and b. Find the product ab. Any help?

*asked on September 1, 2014* -
## physics

A coil has an inductance of 9.00 mH, and the current in it changes from 0.200 A to 1.50 A in a time interval of 0.300 s. Find the magnitude of the average induced emf in the coil during this time interval.

*asked on April 27, 2017* -
## English

What is the climax of the white knight

*asked on June 4, 2019* -
## Chemistry

Why is (E)-1,2-diisopropylethene more stable than (Z)-1,2-diisopropylethene? Why are they more stable than 1,1-diisopropylethe? And doesn't the bond angle between the C=C-C carbons increase with (Z)-1,2-diisopropylethene > (E)-1,2-diisopropylethene >

*asked on June 17, 2009* -
## chemistry

balance equation by electron balancing method cl2 + oh- = cl- + clO3- + h2O

*asked on December 14, 2019* -
## physics

A helicopter weighs 3920 newtons, caculated the force on it if it is ascending up at a rate of 2m/s squre ,what wil b force on helicopter if it is moving up with the constant speed of 4m/s .

*asked on September 15, 2014* -
## physics

a 20 kg loudspeaker is suspended 2m below a ceiling by two 3m-long cables that angle outward at equal angles. what is the tension in the cables?

*asked on November 11, 2010* -
## Math-PLEASE check my answers

What types of problems can be solved using the greatest common factor? What types of problems can be solved using the least common multiple? Complete the explanation. *** Use the words 'same' and 'different' to complete the following sentences.*** Problems

*asked on September 11, 2014* -
## math

One pipe fills a storage pool in 20 hours. A second pipe fills the same pool in 15 hours. when a third pipe is added and all three are used to fill the pool , it takes only 6 hours. Find how long it takes the third pipe todo the job.

*asked on December 4, 2012* -
## math

In 6 hours,an experienced cook prepares enough pies to supply a local restaurant's daily order. Another cook prepares the same number of pies in 7 hours. Together with a third cook, they prepare the pies in 2 hours. Find how long it takes the third cook to

*asked on December 4, 2012* -
## Finance

For the following investment, calculate the present value (principal) and the compound interest. Use Table 11-2. Round your answers to the nearest cent. Click here for Table 11-2 Compound Amount $130,000 Term of Investment 12 yrs Nominal Rate 11% Interest

*asked on July 31, 2020* -
## Finance

Solve the following word problem by using Table 11-2. How much must be invested today at 16% compounded quarterly to have $7,000 in 4 years? Round your answer to the nearest cent.

*asked on July 31, 2020* -
## Finance

Solve the following exercise by using the present value formula. Mike Gioulis would like to have $33,000 in 4 years to pay off a balloon payment on his business mortgage. His money market account is paying 2.19% compounded daily.Disregarding leap years,

*asked on July 31, 2020* -
## Analytical Chemistry

Current is applied to an aqueous solution of calcium sulfide. Multiple choice help please??! What is produced at the cathode? A) H2(g) B) S(s) C) O2(g) D) Ca(s) What is produced at the anode? A) O2(g) B) H2(g) C) Ca(s) D) S(s)

*asked on March 30, 2013* -
## calculus

If f is the focal length of a convex lens and an object is placed at a distance p from the lens, then its image will be at a distance q from the lens, where f, p, and q are related by the lens equation 1/f = 1/p + 1/q What is the rate of change of p with

*asked on May 6, 2011* -
## Physics

A dentist's drill starts from rest. After 3.20 s of constant angular acceleration it turns at a rate of 2.7 104 rev/min. (a) Find the drill's angular acceleration. (b) Determine the angle (in radians) through which the drill rotates during this period.

*asked on November 4, 2010* -
## calculus

Consider a particle moving along the x-axis where x(t) is the position of the particle at time t, x'(t) is its velocity, and x''(t) is its acceleration. A particle moves along the x-axis at a velocity of v(t) = 5/√t, t > 0. At time t = 1, its position is

*asked on April 7, 2016* -
## Finance

Solve the following word problem by using Table 11-2. Stuart Daniels estimates that he will need $24,000 to set up a small business in 6 years. Round your answers to the nearest cent. Click here for Table 11-2 a. How much must Stuart invest now at 8%

*asked on July 31, 2020* -
## Math

Suppose that 32 feet of fencing is available to enclose a rectangular garden., one side of which will be against the side of a house. What dimensions of the garden will guarantee a maximum area?

*asked on January 9, 2017* -
## calculus

Consider a window the shape of which is a rectangle of height h surmounted by a triangle having a height T that is 1.1 times the width w of the rectangle If the cross-sectional area is A, determine the dimensions of the window which minimize the perimeter.

*asked on April 1, 2013* -
## Math

A shop owner blends three types of coffee,A,B,C.in the ratio 3:5:7 a) calculate the weight of each type of coffee in 45kg of three blended mixture. b) given that type A coffee cost $7 per kg, type B coffee costs $10 kg and type C coffee costs $13 per kg,

*asked on December 31, 2016* -
## Reading

In adventures of Isabel the only one of Isabel's enemies who survives is a? A.the bear B. the witch C. the giant D. the doctor

*asked on February 8, 2016* -
## English

Choose the sentence that is written in active voice. A. A serious accident was prevented on the highway by Roger's quick thinking. B. Roger's quick thinking prevented a serious accident on the highway. C. A serious accident was prevented on the highway. D.

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

Mark averaged 60 miles per hour during the 30-mile trip to college. Because of heavy traffic he was able to average only 40 miles per hour during the return trip. What was Mark's average speed for the round trip?

*asked on March 24, 2013* -
## Vectors

A traffic sign is hanging from two wires. If the weight of the sign is 35 N, what are the tensions in the two wires as shown below? Traffic sign hanging by two wires, making an angle of 56 and 45

*asked on July 20, 2019* -
## psychology

Developmental psychologists study all of the following EXCEPT: -What part of the brain is involved in the development of depression - Smoking trends of adolescents - Prenatal development - Aging issues of the elderly - How personality develops across the

*asked on July 12, 2020* -
## Physics

Let n represent the number of similar resistors in a circuit. Each resistor has a resistance of r. When the resistors are connected in parallel the circuit has a total resistance of R. What would the total resistance of the circuit be if the resistors were

*asked on August 20, 2017* -
## physics

A large tank is filled with water to a depth of d = 18 m. A spout located h = 13 m above the bottom of the tank is then opened as shown in the drawing. With what speed will water emerge from the spout?

*asked on January 17, 2010* -
## MAth

IN RECTANGLE ABCD ,AB=25CM, BC=15CM. IN WHAT RATIO DOES BISECTOR OF ANGLE C DIVIDES AB?

*asked on April 23, 2017* -
## Chemistry

energy required for ionisation of 0.02 gram atom of magnesium is x Kj .the amount of energy required to ionise 1 atom of magnesium is

*asked on June 5, 2015* -
## Chemistry

To identify a diatomic gas (X2), a researcher carried out the following experiment: She weighed an empty 5.3-L bulb, then filled it with the gas at 1.30atm and 27.0 ∘C and weighed it again. The difference in mass was 7.9g . Identify the gas. Express your

*asked on August 20, 2014* -
## physical

A box slides downwards at a constant velocity on an inclined surface that has a coefficient of friction uK = .58 The angle of the incline, in degrees?

*asked on July 30, 2013* -
## Chemistry

Iron (III) Nitrate reacts with Sodium Carbonate to form a precipitate. Be sure to indicate oxidation states (charges on each ion) & the precipitate. Skeletal Equation: Ionic Equation: (assume all ions are aqueous, dissociated free ions) NET Ionic Equation:

*asked on January 20, 2019* -
## algebra

The loudness, L L, of a sound (measured in decibels, dB) is inversely proportional to the square of the distance, d d, from the source of the sound. Round to 3 decimal places. A person 15 feet from a jetski, it is 75 decibels loud. How loud is the jetski

*asked on February 9, 2016* -
## math

Is this the right way to answer this question? A physics exam consists of 9 multiple-choice questions and 6 open-ended problems in which all work must be shown. If an examinee must answer 7 of the multiple-choice questions and 3 of the open-ended problems,

*asked on August 23, 2009* -
## Trigonometry

A calculator is broken so that the only keys that still work are the sin, cos, tan, cot, sin^-1, cos^-1, and tan^-1 buttons. The display initially shows 0. In this problem, we will prove that given any positive rational number q, show that pressing some

*asked on October 31, 2013* -
## physics

Use R = 8.2 × 10–5 m3 atm/mol K and NA = 6.02 × 1023 mol–1. The approximate number of air molecules in a 1 m3 volume at room temperature (300 K) and atomospheric pressure is:

*asked on June 24, 2009* -
## Math

The perimeter of a rectangular garden is 108 meters. The length is 6 meters longer than twice the width. Find the dimensions of the garden.

*asked on November 1, 2017* -
## Trig - Law of sines and cosines

ABC is an equilateral triangle with side length 4. M is the midpoint of BC, and AM is a diagonal of square ALMN. Find the area of the region common to both ABC and ALMN. I drew the diagram but I don't know how to find the answer? I think it has something

*asked on November 19, 2013* -
## Physics

to strengthen his arm and chest muscles, an 82-kg athlete who is 2.0 m tall is doing push ups. his center of mass is 1.15 m from the bottom of his feet, and the centers of his palms are 30.0cm from the top of his head. find the force that the floor exerts

*asked on November 7, 2012* -
## PHYSICS

WHAT DO YOU MEAN BY "POSITIVE ION(CATION)" DOES IT HAVE A VALUE OF -e= -1.6x10^-19? or the opposite one +e?

*asked on July 11, 2020* -
## biology

1. Record your observations of the roots of the bean and radish plants in the appropriate data chart. Be sure to include a sketch of each plant’s roots. Answer: Data Chart: Bean Plant Nodules present? Number of nodules Number of pink nodules Number of

*asked on June 1, 2011* -
## Trignometry

In Philadelphia the number of hours of daylight on day t (t is the number of days after january 1) is modeled by the function L(t)= 12+2.83sin((2*Pi)/365(t-800) a. Which day have about 10 hours of daylight? b. How many days of the year have more than 10

*asked on April 15, 2017* -
## Geometry

Find the distance between the lines with the equations y = 3/2x+4 and −3x+2y = −1. Round your answer to the nearest tenth.

*asked on October 29, 2015* -
## calc

integral: sqrt (16 + 6x − x^2) dx

*asked on June 27, 2014* -
## Analytical Chemistry

Calculate the pH at the equivalence point for the titration of 0.160 M methylamine (CH3NH2) with 0.160 M HCl. The Kb of methylamine is 5.0× 10–4. Methylamine is a weak base and reacts with HCl to give the methylammonium ion. HCl + CH3NH2 CH3NH3^+ + Cl^-

*asked on February 27, 2013* -
## Calc 2: Area under the curve

Find the area of the region enclosed between y=2sin(x and y=3cos(x) from x=0 to x=0.4pi Hint: Notice that this region consists of two parts. Notice: I'm getting 1.73762 but apparently that is wrong.

*asked on April 20, 2011* -
## chemistry

what is the molality of a 10.5% by mass glucose solution?. density of the solution is 1.03g/ml can someone please explain how to do this question. please and thank you

*asked on February 10, 2011* -
## physics

Calculate the net work output of a heat engine following path ABCDA in Figure 14.30, where V1 = 5.0 10-3 m3 and V2 = 20.0 10-3 m3.

*asked on December 6, 2013* -
## Math

What is the next number in the pattern 20,000; 4,000; 800; 160?

*asked on January 13, 2011* -
## Chemistry

While titrating 25.00mL of a weak acid, HA, with 0.1500M NaOH, you reach equivalence point after adding 27.00mL of the NaOH. The pH of the acid initially was 2.48. What is the dissociation constant of the acid?

*asked on October 27, 2008* -
## math 10

a British researcher developed a formula to determine walking or running speed based on hip height and stride length. The formula is s= 0.78l ^1.67/ h^1.17 where s is speed in meters per second l is stride length in meters, and hi is the individual hip

*asked on December 5, 2017* -
## math 11

How much alfalfa should be added to 60L of ostrich pellets to create a mix that is 32% alfalfa by volume? I have no idea how to start this question. If I let x be the alfalfa and x+60 = 32 be the mix

*asked on March 29, 2018* -
## Statistics Question

Consumer Reports rated airlines and found that 80% of flights involved in the study arrived on time (that is, within 15 minutes of scheduled arrival time). Assuming that the on-time rate is representive of the entire commercial airline industry, consider a

*asked on December 14, 2011* -
## Statistics / Math

A tourist in Ireland wants to visit seven different cities. If the route is randomly selected, what is the probability that the tourist will visit the cities in alphabetical order?

*asked on February 26, 2008* -
## Trigonometry - Proofs

Prove that the average of the numbers n sin (n degrees) (n = 2, 4, 6, ... 180) is cot (1 degree) Hint: Express everything in terms of sin and cos. Can you rearrange the result into a form that allows you to use some of the identities you've learned? How to

*asked on November 12, 2013* -
## Physics

The drawing shows a collision between two pucks on an air-hockey table. Puck A has a mass of 0.025 kg and is moving along the x axis with a velocity of +5.5 m/s. It makes a collision with puck B, which has a mass of 0.060 kg and is initially at rest. The

*asked on October 23, 2012* -
## Genetics

If the litter resulting from the mating of two short-tailed cats contains three kittens without tails, two with long tails, and six with short tails, what would be the simplest way of explaining the inheritance of tail length in these cats? Show genotypes.

*asked on May 8, 2019* -
## math

A shipment of 9 printers contains 4 that are defective. Find the probability that a sample of size 4, drawn from the 9, will not contain a defective printer . the probability is ?

*asked on August 10, 2016* -
## Main Ideas

Both Seagulls and wild geese are large birds. They're also similar in that both kinds of birds can fly over great distances. On the other hand, seagulls are scavengers, while wild geese aren't. Seagulls, for example, are often found around garbage dumps.

*asked on September 27, 2013* -
## Chemistry Help

The specific heat of zinc is 0.386 J/g degrees Celsius. How many joules would be released when 454 grams of Zinc at 96.0 degrees Celsius were cooled to 28.0 degrees Celsius.

*asked on October 25, 2012* -
## chem110

What is the value of the smallest bond angle in XeF4?

*asked on December 6, 2010* -
## Geometry

Polygon ABCD is similar to polygon WXYZ. If AB = 8, WX = 12, and CD = 10, find YZ.

*asked on July 26, 2010* -
## Algebra 1

A square painting is surrounded by a frame. the outside edges of the frame are x inches in length, and the frame is 3 inches thick. What is the total area of the frame? A)-12x+36 B)12x-36 C)x^2+12x+36 D)x^2-12x-36 Is it C or D?

*asked on December 22, 2016* -
## college gen chem

An igneous rock contains a Pb−206/U−238 mass ratio of 0.367. How old is the rock? (U−238 decays into Pb−206 with a half-life of 4.50×109 yr.) I'm not sure how to get started on this :/

*asked on December 6, 2014* -
## Math - Precalculus - Parametric Equations/Geometry

A hockey puck of diameter 3 inches is spinning around its center at a speed of 3 counterclockwise rotations per second. The center of the puck is traveling at a speed of 24 inches per second at an angle of 45 degrees to the positive real axis. (a) At time

*asked on December 11, 2013* -
## math

The quotient of a number and 3, minus 1, equals 5/3. Find the number.

*asked on December 4, 2012* -
## math

Form a polynomial f(x) with real coefficients, with leading coefficient 1, having the given degree and zeros. Degree: 4; zeros: -4+3i and 1; multiplicity of 2

*asked on July 3, 2020* -
## Math

Suppose T is a transformation from ℝ2 to ℝ2. Find the matrix A that induces T if T is reflection over the line y=−3/2x. Please give me the solution

*asked on November 12, 2019* -
## ALGEBRA

A baseball team has 13 players; how many possible batting orders can the coach make if there are 9 players in the batting lineup?Hello can you help with this problem i try different ways to solve it but it is not match with my answers A. 235,368 B.

*asked on November 16, 2016* -
## Physics

A basketball player is running at 5.00 m/s directly toward the basket when he jumps into the air to dunk the ball. He maintains his horizontal velocity. (a) What vertical velocity does he need to rise 0.750 meters above the floor? (b) How far from the

*asked on March 17, 2014* -
## chemistry

calculate the percentages by mass of the component element in sodium trioxonitrate(v)

*asked on January 28, 2014* -
## Geometric Series question? Help!?

A bouncy ball bounces to 2/3 of its height when dropped on a hard surface. Suppose the ball is dropped from 20 m. What is the height of the ball after the 6th bounce? Answer = 1280/729 m OR 1.75 m What is the total distance travelled by the ball after 10

*asked on May 29, 2013* -
## Chem II

PCl5 dissociates according to the reaction: PCl5(g) ↔ PCl3(g) + Cl2(g). One mole of PCl5 was placed in one liter of solution. When equilibrium was established, 0.5 mole of PCl5 remained in the mixture. What is the equilibrium constant for this reaction?

*asked on February 29, 2012* -
## chemistry

Finding molarity and molality(best answer)? An aqueous solution is prepared by diluting 3.30 mL acetone,(d= 0.789g/mL) with water to a final volume of 75.0 mL. The density of the solution is 0.993 g/mL. What is the molarity, molality and mole fraction of

*asked on October 7, 2011* -
## calculas 1

A child places n cubic building blocks in a row to form the base of a triangular design (see figure). Each successive row contains two fewer blocks than the preceding row. Find a formula for the number of blocks N used in the design. (Hint: The number of

*asked on May 7, 2016* -
## Social Studies

Why did democracy develop during the Roman Republic? Members of lower social classes began to demand representation in government. Romans wanted to prevent one leader from gaining too much power. Romans wanted to model their system of government after

*asked on March 7, 2016* -
## Physics

An automobile with 0.310 m radius tires travels 85,000 km before wearing them out. How many revolutions do the tires make, neglecting any backing up and any change in radius due to wear?

*asked on March 17, 2014* -
## Parametric equations/Trigonometry - Lattice points

A lattice point is a point with integer coordinates. How many lattice points (x,y) with -100 less than or equal to x less than or equal to 100 and -100 less than or equal to y less than or equal to 100 are on the graph of the parametric equations x=30-40

*asked on December 10, 2013* -
## Chemistry

What is the formula mass of ammonium phosphide, (NHsubscript4)subscript3P? 85.0 u 49.0 u 48.0 u 57.0 u I thought I was to look these up in the Periodic Table, but they aren't there, so I'm confused on what to do. Any help would be appreciated.

*asked on July 24, 2010* -
## stats

A normal population has mean 100 and variance 25. How large must the random sample be if we want the standard error of the sample average to be 1.5? I know the answer is 12. Would someone please be able to explain! and share what formula they used

*asked on December 3, 2014* -
## Physics

how much energy is required to change 40 g of ice at -10 C to steam at 110 C?

*asked on January 12, 2014* -
## Chemistry

The standard molar Gibbs free energy of formation of NO2 (g) at 298 K is 51.30 kJ · mol −1 and that of N2O4 (g) is 97.82 kJ · mol −1 . What is the equilibrium constant at 25 ◦ C for the reaction 2 NO2(g) N2O4(g) ?

*asked on October 14, 2012* -
## physics

A wagon is rolling forward on level ground. Friction is negligible. The person sitting in the wagon is holding a rock. The total mass of the wagon, rider, and rock is 94.0 kg. The mass of the rock is 0.350 kg. Initially the wagon is rolling forward at a

*asked on October 22, 2011* -
## physics

9. A stone is thrown at an angle of 30° above the horizontal from the top edge of a cliff with an initial speed of 19.6 m/s. A stop watch measures the stone's trajectory time from top of cliff to bottom to be 6.7 s. How far out from the cliff's edge does

*asked on June 10, 2010* -
## Math 116

one canned juice drink is 15% orange juice; another is 5% orange juice. how many liters of each should be mixed together in order to get 10L that is 9% orange juice?

*asked on August 16, 2008* -
## engineering

An aircraft flies at an altitude of 30,000 feet. Determine the air temperature (in [K]), air pressure (in [Pa]) and air density (in [kg/m3]) at this altitude, according to the standard atmosphere.

*asked on July 7, 2017* -
## calculas 1

Use upper and lower sums to approximate the area of the region using the given number of subintervals (of equal width). (Round your answers to three decimal places.) y = 7/x number of interval between are 5 upper sum= lower sum=

*asked on May 7, 2016* -
## Pre-Calculus

f(x) = cos(x) on the interval [−2π, 2π] (a) Find the x-intercepts of the graph of y = f(x). (Enter your answers as a comma-separated list.) (b) Find the y-intercepts of the graph of y = f(x). (Enter your answers as a comma-separated list.) (c) Find the

*asked on November 29, 2015*