# Ruth

Most popular questions and responses by Ruth-
## Pre calc

evaluate the expression under the given conditions. cos(θ − ϕ); cos(θ) = 5/13, θ in Quadrant IV, tan(ϕ) = − square root15,ϕ in Quadrant II Anyone know how to do this I have never been this confused in my life

*asked on April 11, 2017* -
## Maths

Two boats A and B left a port C at the same time on different route .B travelled on a bearing of 150 degree and A travelled 8km and B had travelled 10km ,the distance between the Two boats was found to be 12km .calculate the bearing of A's route from C.

*asked on June 13, 2017* -
## chemistry

What separatation method used to separate silver chloride (solid))and sodium trioxonitrate

*asked on January 12, 2018* -
## Econ/stats

The following data represent the number of flash drives sold per day at a local computer shop and their prices. Price (x) Units Sold (y) $34 3 36 4 32 6 35 5 30 9 38 2 40 1 a. Develop a least-squares regression line and explain what the slope of the line

*asked on April 29, 2012* -
## Geography

What is the relation between geography and chemistry

*asked on October 19, 2011* -
## maths

Three bags of wheat,two bags of corn, and one bag of oats weigh the same as one bag of wheat,one bag of corn and five bags of oats,if two bags of corn and one bag of oats weights 25 pounds and one bags of corn weights 10 pounds,How much does one bag of

*asked on October 8, 2016* -
## physics

a galvanometer has a resistance 60 ohm and is of 5mA full scale deflection.how would you modify it so as to get 0-10V voltmeter

*asked on March 6, 2016* -
## Chemistry

Hydrazine has the formula N2H4 and is used as a rocket fuel (e.g. for the Apollo moon rockets). It burns in the following reaction for which the enthalpy change is -583 kJ/mol. N2H4(g) + O2(g) → N2(g) + 2 H2O(g) Calculate the N-N bond enthalpy in

*asked on November 15, 2017* -
## Chemisty

How do i convert 0.0024 to scientific notation

*asked on January 11, 2010* -
## maths

A straight highway leads to the foot of a tower of height 50m. From the top of the tower, the angles of depression of two cars standing on the highway are 30 degree and 60 degree. What is the distance between the two cars and how far is each car from the

*asked on October 17, 2013* -
## Algebra (Quadratics)

The height y (in feet) of a baseball thrown by a child is y = -1/10 x^2 + 3x + 6 where x is the horizontal distance (in feet) from where the ball was thrown. Will the ball fly over the head of another child 30 feet away trying to catch the ball? (Assume

*asked on September 25, 2014* -
## geography

what factors account for the similarities and differences between the subdivisions in tropical climate zones?

*asked on September 9, 2012* -
## Chemistry

Describe the manner in which ketohexose acts as a reducing sugar in the Benedict test.

*asked on September 16, 2008* -
## History

Is this ok? The Industrial Revolution was a period from the eighteenth to the nineteenth century during which major changes in agriculture, manufacturing, mining, and transport had a massive effect on the social, economic,and cultural conditions starting

*asked on March 4, 2010* -
## physics

A stunt flier is moving at 15m/s parallel to the flat ground 100m below,how large must the distance x from plane to target be if a sack of flour released from the place is to strike the target?

*asked on October 8, 2017* -
## Algebra

How do I answer this? Robert needs to cut four shelves from a board that is 2.5 meters long. The second shelf is 18 centimeters longer than twice the length of the first shelf. The third shelf is 12 centimeters shorter than the first shelf. The remaining

*asked on April 13, 2015* -
## math

A limited access highway had an access reduction and lost 1/13 of its exits. If 264 of its exits were left after the reduction how many exits were there originally?

*asked on May 9, 2013* -
## chemistry

calculate the total vapour pressure of mixture of methanol(64g) and ethanol(92g) at 298K given that the pure vapour pressure of methanol is 90mmHg and ethanol is 45mmHg (C=12, H=1, O=16)

*asked on May 24, 2019* -
## physics

1)a galvanometer has a resistance of 40 ohm and is of 3 mA full-scale deflection.how would you modify it to act as a 0-5 A ammeter? 2)the galvanometer described in question 1 is to be converted into a 0-5 V voltmeter. a)when the voltmeter is connected to a

*asked on March 2, 2016* -
## chemistry

what are the limitations of depression of freezing point

*asked on May 25, 2019* -
## Chemistry

Give a acid-base pairs which produce Na2CO3 as a salt

*asked on October 8, 2014* -
## writing

The cost of new homes is high today. Many people are purchasing older homes in need of renovation. the most effective combination of sentences 1 and 2 would include which of the following groups of words? 1) although many homes need renovation 2)although

*asked on June 10, 2011* -
## life orientation

how can i advise a friend who response to a conflict avoidance that is not a healthy for sustaining positive relationship

*asked on February 3, 2019* -
## pre calc

To measure the height of the cloud cover at an airport, a worker shines a spotlight upward at an angle 75° from the horizontal. An observer D = 600 m away measures the angle of elevation to the spot of light to be 45°. Find the height h of the cloud

*asked on March 27, 2017* -
## Pre calc

sin(θ − ϕ); tan(θ) = 5/12 θ in Quadrant III, sin(ϕ) = − sqaure root10/10 ϕ in Quadrant IV. I used the sin equation sin(a)cos(b)-sin(a)cos(b) However I am still getting the wrong answer

*asked on April 11, 2017* -
## writing

Still, do-it-yourself renovations is usually a source of pride for new homeowners, no matter how hard or how frustrating. what correction should be made to this sentence? 1)remove the comma after still 2)change is to are 3) change the spelling of usually

*asked on June 10, 2011* -
## Math

2500 students take a college entrance exam. The scores on the exam have an approximate normal distribution with mean u = 52 points and a standard deviation o = 11 points. Estimate the percentage of students scoring 52 points or more. ^ How would you do

*asked on May 7, 2013* -
## Physics

A driver in a car traveling at a speed of 21.8m/s see a cat 101m away on the road. How long will it take for the car to accelerate uniformly to a stop in exactly 90m?

*asked on October 25, 2010* -
## physics

Helium gas occupies a volume of 0.04 m 3 at a pressure of 2 x 10 5 Pa (Nm -2 ) and temperature of 300 K. Calculate (i) the mass of the helium. (ii) the r.m.s. speed of its molecules. (iii) the r.m.s. speed at 432 K when the gas is heated at constant

*asked on October 24, 2016* -
## physics

an electron moves in the plane of paper toward the top of the page .a magnetic field is also in the plane of the page and directed toward the right .what is the direction of the magnetic force on the electron ?

*asked on March 10, 2016* -
## writing

Doctors in the field of preventive medicine concentrate on "preventing disease and to encourage" good health practices. Best way to write the portion? 1) preventing disease and to encourage 2)prevent disease and to encourage 3)to prevent disease and to

*asked on June 10, 2011* -
## Math

An arc of lemgth 28cm subtends an angle at the centre of a circle. In the same circle, what angle does an arc of length 35 subtend

*asked on March 9, 2018* -
## Organic Chem

Write a balanced equation showing the reaction of trimyristin and aqueous NaOH

*asked on October 10, 2011* -
## English Criticism

POEM FOR ELSA by Michael Roberts THAT day the blue-black rook fell pitifully dead You wept and stormed, tossing your lovely head, Hurling commiseration into broken skies That wept and wept, vainly as any eyes. You pitifully wept, nor would be comforted

*asked on November 22, 2008* -
## writing

They emphasized the importance of good maternal and child health care, including the administering of vaccines. what correction should be made to this sentence? 1) replace they with it 2) change emphasized to emphasize 3) change the spelling of importance

*asked on June 10, 2011* -
## mathematics

in a class of 50 student,18 offered mathematics, 21 offered chemistry while 16 offered biology, 7 student offered mathematics and biology, 9 student offered chemistry and biology while 5 student offered the three subject combination. a) find the numbers of

*asked on May 29, 2019* -
## maths

The shadow of a tower standing on a level ground is found to be 2x meters longer when sun's altitude is 30 degree than when it was 45 degree.Find the height of the tower.

*asked on October 17, 2013* -
## writing

Sentence 10: Finally, friends whom you haven't seen in years, long-lost relatives, and even mere acquaintances will begin calling in february to plan a lengthy visit with you in the summer. what correction should be made to this sentence? 1)change friends

*asked on June 10, 2011* -
## introduction to oorganisational psychology

conflict has always been a part of our lives, especially in the decision making processes. write down a case of multiple approach-avoidance conflict that you have experienced personally. how did you react? do not forget to include all the variance of this

*asked on March 4, 2016* -
## mathematics

perform the indicated operation and express your result In a standard form i) (4+3i) + (6+4i) ii) 3 + 4i/6+3i

*asked on May 29, 2019* -
## Math

A bucket when a fifth full holds 10 litres .How many litres will it hold when it is full?

*asked on October 29, 2018* -
## Algebra

Martina hits a volleyball with a velosity of 13 m^s. When she hits the ball it is 1m above the ground. How long will ot take for the ball to hit the ground.

*asked on January 15, 2016* -
## physics

A man of mass 67.1 kg stands on a scaffold supported by a vertical rope at each end. The scaffold has a mass of 24.6 kg and is 3.6 m long. Suppose the man stands to the right from the middle of the scaffold that is a distance one sixth of the length of the

*asked on November 15, 2011* -
## History

Hello. I am doing an essay on the impact of the industrial revolution. I have done the intoduction and two paragraphs. Please can you give me some feedback. thanks What was the impact of the Industrial Revolution The Industrial Revolution was a period from

*asked on March 3, 2010* -
## math

The human resources department of a consulting firm gives a standard creativity test to a randomly selected group of new hires every year. This year, 50 new hires took the test and scored a mean of 111.6 points with a standard deviation of 14.3. Last year,

*asked on December 14, 2018* -
## Statistics

Let X1;X2;X3;...;X6 be a random sample from a distribution with the following probability desity function: Fx(x) = (1+4x)/3 for 0

*asked on August 10, 2006* -
## physics

describe the force board experiment to show how to obtain the resultant of two non-parallel coplanar forces acting at a point.

*asked on September 12, 2018* -
## Physics

7. In a meeting room, there are chairs, a table, and people. Which of these things has a temperature a) lower than, b) greater than, or c) equal to the temperature of the air?

*asked on April 27, 2010* -
## Biology

List 15 mechanical and 15 biological vectors and the diseases they transmit.

*asked on November 13, 2018* -
## College Algebra

Use rational root theorem and the factor theorem to help solve the following equation X4-2x3-13x2+38x-24=0

*asked on November 6, 2011* -
## physics

Suppose a person weighs 160 pounds on Earth. How much would that person weigh on a planet that was three times as massive as Earth and had a radius that was twice that of Earth's?

*asked on September 29, 2011* -
## Physics

A body travels from rest with acceleration 8m/s(squared)Find its velocity when it has covered a distance of 100 meter?

*asked on August 24, 2014* -
## physics

Superman throws a boulder of weight 3800 N at an adversary. What horizontal force must apply to the boulder to give it a horizontal acceleration of 13.5 m/s^2?

*asked on October 19, 2011* -
## mathematics

find the modulus argument and principal argument of each of the following a) i b) -√5

*asked on May 29, 2019* -
## Econ/stats

The following data represent the number of flash drives sold per day at a local computer shop and their prices. Price (x) Units Sold (y) $34 3 36 4 32 6 35 5 30 9 38 2 40 1 a. Develop a least-squares regression line and explain what the slope of the line

*asked on April 29, 2012* -
## maths

jimush walks 40m eastward and 30m southward the angle made between the two distance is 90degree calculate the other angels

*asked on October 13, 2019* -
## statistics

Bellevue Hospital in New York City uses 100.6 degrees F as the lowest temperature considered to indicate a fever. a. What percentage of normal and healthy adults would be considered to have a fever? b. Does this percentage suggest that a cuttoff of 100.6

*asked on May 9, 2010* -
## math

Express 4.050505... as a fraction

*asked on August 20, 2018* -
## physics

What is quantity of heat required to melt down completely 1kg of ice at 30 degree celsius

*asked on May 18, 2016* -
## PYSICS

The upward normal force exerted by the floor is 600 N on an elevator passenger who weighs 610 N. What is the reaction force to the upward normal force exerted by the floor? What is the reaction force to weight of the passenger? What is the magnitude of the

*asked on October 19, 2011* -
## physics

a conducting loop consisting of a half circle of radius r=0.2m and three straight sections the half circle lies in a uniform magnetic field B that is directed out of the page the field magnitude is given by B=(4t^2 + 2t + 3)T .w/r t is in second. an ideal

*asked on March 31, 2016* -
## Math

Find the square root of 25xsquared-40xy+16ysquared

*asked on September 15, 2017* -
## History

This is my introductory paragraph. The Industrial Revolution was a period from the eighteenth to the nineteenth century where major changes in agriculture, manufacturing, mining and transport had a massive effect on the social, economic and cultural

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

If 20g of NaCl was used to form a 250cm3 of saturated solution of NaCl at 25oC. Calculate the solubility of the salt in mol/dm3 at that temperature. (Relative density of solution-1).

*asked on December 12, 2018* -
## physics

what is the potential energy of 4 point charges each of value Q at the corners of a square of side length a.

*asked on December 28, 2015* -
## Pre calc

A 20-ft ladder is leaning against a building. If the base of the ladder is 7 ft from the base of the building, what is the angle of elevation of the ladder? (Round your answer to one decimal place.) How high does the ladder reach on the building? (Round

*asked on April 4, 2017* -
## physics

find the drift velocity of the electrons in the copper wire (there are 8.5*10^28 free electrons per m^3 in copper)

*asked on February 18, 2016* -
## Math

Determine the number of diagonals in a regular 40-gpn

*asked on September 13, 2013* -
## Algebra

Parking in a student parking lot costs 2.00 for the first half hour and $1.75 for each hour thereafter. A partial hour is charged the same as a full hour. What is the longest time a student can park for $9.00? Show your work.

*asked on March 9, 2013* -
## math

the radius r of a sphere is increasing at a rate of 3cm/min. find the rate of change of the area when r=3cm

*asked on February 22, 2016* -
## Math

Tanker boats cannot be in the bay when the depth of water is less or equal to 25 feet. Set up an inequality and solve it graphically to determine all points in time, t, on the interval 0 less than or equal to t less than or equal to 24 when tankers cannot

*asked on August 22, 2012* -
## Chemistry

Calculate ∆Hºf /mol for propane, C3H8(g), given the following reaction: (10 points) C3H8(g) + 5O2(g) → 3CO2(g) + 4H2O(ℓ ); ∆Hºrxn = -2219.9 kJ

*asked on April 9, 2012* -
## Algebra (Work Problem)

Susan's backyard has three faucets: A, B and C. If she turns on all three of them, it takes 380 minutes to fill the pool. If she turns on only A and B, it takes 570 minutes, and if she turns on only B and C, it takes 760 minutes. If she turns on only A and

*asked on September 22, 2013* -
## math

express 7.179179... as a fraction

*asked on August 20, 2018* -
## chemistry

the reaction A+3B->2C+D is first order with respect to reactant A and second order with respect to reactant B if the concentration of A is doubled the concentration of B is halfed and the rate of the reaction would -------by a factor of --------

*asked on March 3, 2016* -
## physics

a parallel plate capacitor has an area of 5cm^2 and a capacitance of 3.5PF. the capacitor is connected to a 12v battery .after the capacitor is completely charge up the battery is removed. a)what must be the separation of the plates and the charge density

*asked on February 15, 2016* -
## Algebra

A 12' ladder leans against a wall at 68 degree angle of elevation. Find the distance from the ladder's base to the wall.

*asked on September 14, 2013* -
## math

write the opposite, reciprocal, and absolute value of each number . A: -1/2 #: 4 C: 0

*asked on September 9, 2011* -
## stats

If a random sample of size n = 65 is drawn, find ¦Ìx, ¦Ò x and P(24 ¡Ü x ¡Ü 26). (Round ¦Ò x to two decimal places and the probability to four decimal places.) ¦Ìx = Correct: Your answer is correct.

*asked on March 3, 2014* -
## Algebra

A sales force has 10 men and 10 women. A production unit of 7 people is set up at random. What is the probality that it will consist of 3 men and 4 women

*asked on September 14, 2013* -
## History

I live in The United Kingdom. And we do not do grades we do Year. I am in Year 8 in United Kingdom. What is that in the United States? No it is an essay. I have been completing it because it is due for tomorrow. If you can please read it and make

*asked on March 4, 2010* -
## Financial Management

The management of cooper Equipment is planning to purchase a new milling machine that will cost 160,000 installed.The old machine has been fully depreciated but can be sold for 15,000. The new machine will be depreciated on a straight-line basis over its

*asked on March 15, 2008* -
## Statistics

Suppose X1;X2;...;X5 is a random sample from a n(0; variance) distribution. define U = X1+X2+X3+X4; V = (X2)^2+(X3)^2+(X4)^2+(X5)^2 and W = U/sqrtV. (a) Name the distribution of U/4 and V/(variance) and give the values of their parameters. (b) (i) Compute

*asked on August 10, 2006* -
## Chemistry

Ethanol has a density of 0.789 g/ml what volume of ethanol in litres would have a mass of 500g

*asked on September 30, 2019* -
## physics

how many electrons drift past a point on for 10 minutes current is 0.2 A.the charge on one electrons 1.6*10^-1

*asked on March 2, 2016* -
## math

A rancher wishes to use 86 ft of fencing to enclose a rectangular paddock and subdivide the region into three smaller areas. If the total enclosed area is 225 ft2, find the dimensions of the enclosed region.

*asked on November 4, 2013* -
## maths

A straight highway leads to the foot of a tower of height 50m. From the top of the tower, the angles of depression of two cars standing on the highway are 30 degree and 60 degree. What is the distance between the two cars and how far is each car from the

*asked on October 17, 2013* -
## Pre Algebra

A wooden railing is 82 feet long. It is to be divided into 4 pieces. Three pieces will be the same length, and the fourth piece will be 2 feet longer than each of the other three. Find the length of each piece.

*asked on February 18, 2013* -
## PHYSIC

1)What must be the orbital speed of a satellite in a circular orbit 740 above the surface of the earth? 2)What is the period of revolution of a satellite with mass that orbits the earth in a circular path of radius 8000 (about 1630 above the surface of the

*asked on November 8, 2011* -
## math

write the opposite, reciprocal, and absolute value of each number . A: -1/2 #: 4 C: 0

*asked on September 9, 2011* -
## History

Can someone please proof read my essay! I am running out of time Please! edit,spell check,grammar please What was the impact of the Industrial Revolution The Industrial Revolution was a period from the eighteenth to the nineteenth century where major

*asked on March 4, 2010* -
## History

By the way. The sentences seem long because your box is not long enough. Thesis:If you do not know the impact of the Industrial revolution, you will not understand anything in this essay. This topic is very good to study because you know about the

*asked on March 4, 2010* -
## Physical Education

The smooth and effective working together of your muscles and bones is what? Some call it muscle tone.

*asked on November 28, 2006* -
## Statistics

A normal population has an expected value of 60 and a variance of 30. Use the central limit theorem to determine what the sample size should be such that the mean has a probability of 90% to fall between the values 58 and 62. One concept of the Central

*asked on August 10, 2006* -
## physics

consider a series R-C circuit consisting of a 30 ohm resistor and 20*10^-6F capacitor connected to a 100V,50Hz power supply.find the magnitude of the current and the angle by which the current leads the voltage.

*asked on April 4, 2016* -
## physics really stuck

A sprinter starts from rest and accelerates for 5s. He then travels at a constant velocity for 10s. Finally he slows down to a stop in 5s. Draw a distance time graph to represent his motion.

*asked on September 17, 2014* -
## Algebra

Find the equation of the circle having the given center and radius. center (-5,1), radius 6 squared.

*asked on September 14, 2013* -
## math

convert the numeral to a numeral in base 10

*asked on May 9, 2013* -
## Criminology

How does rational choice theory work when someone is commiting a crime

*asked on July 21, 2012* -
## Algebra

Students in an English class took a final exam. They took equivalent forms of the exam at monthly intervals thereafter. The average score S(t), in percent, after t months was found to be given by . a) What was the average score when they initially took the

*asked on February 1, 2012*