# Roy

Popular questions and responses by Roy-
## Trigonometry

A plane is headed due east with airspeed of 240 mph. if a wind at 40 mph is bloiwing from the north , find the ground speed of the plane.

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

The hypotenuse of a right triangle is 34cm. find the length of the two legs, if one leg is 14cm longer than the other.

*asked on September 8, 2012* -
## Trigonometry

Points A and B 1000 meter apart are plotted on a straight highway running east and west. from A, the bearing of tower C is N32*W and from be, the bearing of C is N64*E. approximate the shortest distance of the tower from the highway. please explain........

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

An electrical source with internal reistance r is used to operate a lamp of resistance R. What fraction of the total power is delivered to the lamp?(a)R+r/R(b)R-r/R (c)R/R+r (d)R/r

*asked on September 15, 2013* -
## Trigonometry

Three ships are situated as follows: A is 225 miles west of C while B, due south of C, bears S25*10'E from A. a. How far is B from A? b. How far is B from C? c. what is the bearing of A from B? PLEASE EXPLAIN

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

peter is twice as old as paul was when peter was as old as paul is now. the combined ages of peter and paul is is 56 years. how old are peter and paul now?

*asked on March 17, 2017* -
## geometry

you just got a n ew dirt bike with really advanced four stroke engine that burns fuel efficiently and you wonder what kind of gas mileage you are getting. like most dirt bikes your new machine has no odometer to record the miles traveled.The rear tire's

*asked on March 15, 2009* -
## Math

The store is selling lemons at $0.33 each. Each lemon yields about 2 tablespoons of juice. How much will it cost to buy enough lemons to make four 9-inch lemon pies, each requiring half a cup of lemon juice? The first time I tried it, it was 1.32 then i

*asked on March 7, 2017* -
## physics

If two wires P and O each of the same length and same material,are connected in parallel to a battery. The diameter of P is half that of Q. What fraction of the total current passes through P?(a)0.2(b)0.25(c)0.33(d)0.5

*asked on September 24, 2013* -
## Calculus

Use implicit differentiation to show dy/dx = [(1-xy)cot(y)]/[x^2 cot(y) + xcsc^2(y)] if xy = ln(x cot y).

*asked on November 13, 2010* -
## english

is there a website for summary notes for old jules by mari sandoz?

*asked on September 14, 2009* -
## geometry

what is the area of a square with a radius of 9? I think the answer is 18 square or 324 Thank you

*asked on May 6, 2009* -
## math

will some one please!!!! please!!! help me I'm doing wacky wordies, only have 3 to do!!! decimal decimal decimal ed ot overs pos'-i'-tive' thanks so much!!

*asked on January 13, 2009* -
## Calculus

Consider a hemispherical bowl with a radius of 12 cm. The bowl contains water to a depth of 9 cm. The density of the water at any point x cm below the surface of the water is given by 2e^(0.15x) g/cm^3. A. Find the volume of the water in the bowl. B. Find

*asked on May 15, 2018* -
## Physics

Ximena stands near the edge of a cliff 20 m above her friend Javier. If she throws a sandwich to Javier at an angle = 30 below the horizontal and it reaches him in 1.0 s, ignoring air resistance, what was the magnitude of the sandwich's initial velocity?

*asked on September 25, 2016* -
## maths

If two dice are toced what is the probility of having a sum of 5 as the outcome(a)1/9(b)1/6(c)1/8

*asked on September 10, 2013* -
## Maths

1) Simplification (trigonometric ratios of allied angles)? Simplify : i) [cos^2 (2x180-A). tan^2 (180+A). sec^2 (180-A)] / [ sin^2 (3x180+ A). cosec^2 (-A). cot^2 (90+A)] ii)[ cos(90+A). sec(270+A). sin(180-A) ] / [ cosec (-A). cos (270-A). tan (180+A) ]

*asked on May 2, 2013* -
## math

A pump brings underground water up to ground level. The water flow is measured in litres per minute.The pump fills an 18 litre bucket in 7 seconds.what is the speed of the pump flow

*asked on February 14, 2013* -
## Trigonometry

A ladder 5 meter long leans against the wall of an apartment house forming an angle of 50 degrees, 32 minutes with the ground. how high up the wall does it reach?

*asked on September 8, 2012* -
## Trigonometry

The perimeter of an isosceles triangle is 6.6824. find its area.

*asked on September 8, 2012* -
## physics 12

A spacecraft of mass 470 kg rests on the surface of an asteroid of radius 1400 m and mass 2.0*10^12. How much energy must be expended so that the spacecraft may rise to a height of 2800 m above the surface of the asteroid? Thanks.

*asked on October 8, 2011* -
## statistics

The participants in a weight-loss class lost the following weights (in pounds) after three weeks of dieting:3,6,0,3,0,0 Assuming that these weights constitute an entire population, find the standard deviation of the population. Round your answer to at

*asked on March 28, 2011* -
## 8th grade

Can you unscramble these letters:afsedrniru

*asked on October 15, 2008* -
## geometry

brain teasers!!! 7 = h. of r. 10 = a. in the b. of r. 4=h. of the a. thanks!!!!

*asked on September 6, 2008* -
## us history

who said "we must all hang together, or we shall all hang separtely"? Thank u!

*asked on February 4, 2008* -
## Math

What’s 56 times 2,000

*asked on December 15, 2019* -
## math

think of a number. Triple it. Add 100. double the result. Add 100. divide the result by 4. subtract one a half time the original number. What is the result?

*asked on March 3, 2017* -
## algebra

Thank you Reiny, we typed it in incorrectly, but believe we have solved it. Will post later.

*asked on April 9, 2016* -
## algebra

-1 -2 1+x = 72x 1 2 1/1+1/x =1/72x 2 1 2 2 (72x /1)1/1+1/x =1/72x (72x/1) 2 72x +72x=1 got stuck here

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

What is the sum of all values of x that satisfy the equation (x2 -5x+5)^(x2 +4x-60) =1? Hint: There are three cases to consider I think I figured out 2 of the cases. The first one being x2 +4x-60=0 while x2 -5x+5=whatever. The second is x2 -5x+5=1 and x2

*asked on January 3, 2016* -
## finance

find the amount for each ordinary annuity if there are payments of $700.00 at the end of each month into an account that pays 10% per annum, compounded monthly

*asked on June 21, 2014* -
## Physics

A 0.020 rubber stopper is swung in a horizontal circle by 0.80 cm thread that makes 30.0 revolution every 20 seconds. a.) what is the stopper's speed? T=? v=(2pi(r))/T

*asked on June 14, 2014* -
## Please do Civics Essay thanks so much

Please Help with essay question. thanks!! In a federal system of government (also known as a federation), the local and state governments share power with the central government, though the central government has final authority. Eplain how this is

*asked on May 1, 2014* -
## Probability

natalie has a bag that contains eight marbles. she draws out a marble, record its color, and puts it back. if natalie repeats this eight times and does not record any red marbles, can she concludes that there are not any red marbles in the bag? Explain

*asked on April 27, 2014* -
## science

A solutuion is prepared by adding 40 grams of NaC1 to 100 grams of water at 80 degrees Celcius. Describe this solution.

*asked on February 3, 2014* -
## calculus

Find the definate integal (upper limit 1, lower limit 0) (7-4x)^2dx

*asked on October 10, 2013* -
## calcus

int sec u du

*asked on October 8, 2013* -
## calcus

int tan^3xsec^3x dx

*asked on October 8, 2013* -
## calcus

int cosxsinx dx

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

What is the self-inductance of an air-core solenoid,1m long and 0.05m in diameter,if it has 1400 turns?(a)5.23mH(b)4.84mH(c)3.63mH(d)2.42mH

*asked on October 1, 2013* -
## physics

A magnetic field is applied to the plain of a flat coil of copper wire. The time variation of the magnetic flux density is given by Bosinwt.At which of the following values of t is the magnitude of the emf induced in the coil a

*asked on September 28, 2013* -
## statistics

suppose that grade point averages of undergraduate students at one university have a bell shaped distribution with a mean of 2.55 and a standard deviation of 0.43. Using the empirical rule, what percentage of students have grade point averages that are

*asked on September 23, 2013* -
## maths

If four coins are flipped in succession,then the number of possible outcomes is(a)8(b)12(c)16(d)14

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

A proton with speed v perpendicular to a magnetic field B is experiencing a force F.If the speed of the proton is doubled,the new force is (a)F/2(b)F(c)2F(d)4F

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

Find dy/dx, if y= 5e^x/cosx

*asked on September 17, 2013* -
## calculus

Find dy/dx, if y= (sinx)^-1

*asked on September 17, 2013* -
## Math

Factorise : 1 + a + b + c + ab + bc + ca + abc

*asked on June 5, 2013* -
## English

(mean,means)Fluoridated water.........fewer Americans are toothless today. (visit,visits)Grandparents and children alike..........their dentist for regular check ups. (love,loves)Dentists.......the fact that there is more awareness about dental hygeiene.

*asked on May 29, 2013* -
## math

what is the formula for working out open cuboid.

*asked on March 4, 2013* -
## math

what is the formula for working out open cuboid.

*asked on March 4, 2013* -
## high shoool algebra

Joy is 20 years older than Bob. Three years ago, Joy was 5 times as old as Bob. How old are they now?

*asked on January 28, 2013* -
## Trigonometry

Two sides of a right triangle are 8, 15 and 17 units. if each side is doubled, how many sqare units will the area of the new triangle be?

*asked on September 8, 2012* -
## Trigonometry

Triangle ABC is a right triangle with right angle at C. CD is perpendicular to AB. BC=4 and CD=1. find the area of the triangle ABC.

*asked on September 8, 2012* -
## geometry

4X Over 30

*asked on January 18, 2012* -
## linear math

8x + 6y = -15

*asked on January 10, 2012* -
## science(chem)

How many moles of sulfate ions are present in 1.2 mol of aluminum sulfate?

*asked on November 25, 2011* -
## umt

2. A charge of -3.00 µC is fixed at the center of a compass. Two additional charges are fixed on the circle of the compass (radius = 0.1 m). The charges on the circle are -4.0 µC at the position due north and +5.0 µC at the position due east. What is

*asked on October 26, 2011* -
## College Chemistry

Plaster of Paris is the compound calcium sulfate hemihydrate, CaSO4*1/2H2O What mass of water is liberated when a 2.763 gram sample is heated to constant mass? The sample is 2.763 grams How much of the 2.763 gram sample is water? I need an amount in grams.

*asked on October 8, 2011* -
## College Chemistry

Plaster of Paris is the compound calcium sulfate hemihydrate, CaSO4*1/2H2O What mass of water is liberated when a 2.763 gram sample is heated to constant mass?

*asked on October 8, 2011* -
## physics 12

If the Earth has a mass of 5.98*10^24 kg and orbits the Sun at a radius of 1.43*10^11 meters. Find the mass of the Sun. Thank you.

*asked on October 7, 2011* -
## algebra

10x.12.25y _______________ 2z.30x.20y help

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

I need to calculate this and I am to asume that all numbers are measurements. I am working with signifigant figures. .6260-.015

*asked on August 24, 2011* -
## chemistry

A NASA satellite showed that in 2003 the ozone hole was much larger than it was in 2002. The 2003 hole measured 1.04 x 107 mi2 in diameter, while the diameter of the 2002 hole was 6.9 x 106 mi2 Calculate the difference in size between the two holes in

*asked on June 26, 2011* -
## Microeconomics

When is international trade an opportunity for workers?

*asked on June 4, 2011* -
## Finance

Having previously identified the location of its Greenfield investment, Acme, a multi-billion public MNE that is incorporated in the U.S., must next obtain external financing for its proposed overseas production facility. It has been estimated that the

*asked on May 27, 2011* -
## science

(1) what measurements and what calculation would you need to make in order to determine the density of a rectangular wooden block? (2) a student announced that she had made a sample of a new material that had a density of 0.85g/cm3. from the inforation

*asked on March 29, 2011* -
## science

(1) what measurements and what calculation would you need to make in order to determine the density of a rectangular wooden block? (2)

*asked on March 29, 2011* -
## math

find the slope of the line given by each equation (1) 7x+13y=91 (2) 7-3y=9x

*asked on March 29, 2011* -
## 8th grade math

if you know that AB=0 and A not=to B, what can you say about the equation Ax+By=1? Describe the graph.

*asked on March 21, 2011* -
## Numerical Analysis

Using the bisection method, Newton’s method, and the secant method, find the largest positive root correct to three decimal places of x3 − 5x + 3 = 0. (All roots are in [−3,+3].)

*asked on February 21, 2011* -
## algebra

11b,6=b-5

*asked on January 23, 2011* -
## algebra

3/x-5=10/x+2

*asked on January 23, 2011* -
## math

3 10 ____ = ____ x-5 x+2

*asked on January 23, 2011* -
## Pre-Calc

Can someone show me how to do this please. I am stuck. find a number x such that e^2x – 12e^x =13

*asked on December 9, 2010* -
## Pre-Calc

I am stuck solving this problem, any help please..Many thanks find all numbers x that satisfy the given equation ln(2x) ------- =2 ln(3x)

*asked on December 9, 2010* -
## Pre-Calc

I am seeking help with this problem Please...Thank you! Find the point on the line y=x+3 in the xy-plane that is closest to the point (3, 2)

*asked on December 7, 2010* -
## Calculus

Use the given derivative to find all critical points of 'f' and at each critical point determine whether a relative maximum, relative minimum, or neither occurs. Assume that 'f' is continuous everywhere. f' (x) = (1-2x)/ ∛(x+3)

*asked on November 29, 2010* -
## Calculus

Use the given derivative to find all critical points of 'f' and at each critical point determine whether a relative maximum, relative minimum, or neither occurs. Assume that 'f' is continuous everywhere. f' (x) = (1-2x)/ ∛(x+3) ∛(x+3)in words is the

*asked on November 29, 2010* -
## advanced algebra

Q. x^-4/5=16 What is x Q. Suppose 0

*asked on April 8, 2010* -
## calculus

Prove that the limit as n approaches infinity of ((n!)^2)/(2n)! is 0. I'm thinking that you have to use the squeeze theorem, but I'm not quite sure how. help please?

*asked on April 6, 2010* -
## math

Prove that the limit as n approaches infinity of ((n!)^2)/(2n)! is 0. I'm thinking that you have to use the squeeze theorem, but I'm not quite sure how. help please?

*asked on April 6, 2010* -
## social studies

how do reform leaders today try wo win support for their causes? thanks

*asked on March 30, 2010* -
## algebra

simplify and write with only positive exponents 1. x to yhe negitive six power times x to the fifth power 2. y to the negitive twelth power divided by 7y to the fifth power

*asked on March 24, 2010* -
## math

amy drove her car the same distance in six hours that juan drove his car in 5 1/2 hours. find the speed (rate) of amy's car, given that she drove 5 mi/h slower than juan.

*asked on September 16, 2009* -
## math

150>4s+2*3s + 2*(15-5s) solve for s

*asked on September 14, 2009* -
## math

Now the largest: Perimerter sum 4s+2w+2l 150>4s+2*3s + 2*(15-5s) solve for s, then w, then l.

*asked on September 14, 2009* -
## Math

a rectangle is 3 times as wide as a square. the rectangle's length is 15 ft shorter than 5 times the square's length. Given that the sum of the two perimeters must be less than 150 ft, find the set of all possible lengths for the rectangle

*asked on September 14, 2009* -
## english

does anyone know where i can find book notes on old jules by mari sandoz?

*asked on September 14, 2009* -
## Math

find three consecutive even intergers for which the sum of the first two integers is greater than 9 more than the third integer, and the sum of the first and third integers is less than 17 more than the second integer

*asked on September 14, 2009* -
## chemistry

determine wheter each of the following reactions occur. 2Ni(s) + MgSO4(aq)---> if it doesnt occur explain why

*asked on April 16, 2009* -
## Please help Math

Gravel is being dumped from a conveyor belt at a rate of 20 cubic feet per minute. It forms a pile in the shape of a right circular cone whose base diameter and height are always equal to each other. How fast is the height of the pile increasing when the

*asked on March 15, 2009* -
## 6th grade

1)Bradley is buying ice cream cones. a double scoop cone cost x dollars. A single scoop costs $0.50 less than a double csoop. A triple scoop cone costs twice as much a single scoop cone. Write an expression to represent the cost of 3 double scoop cones and

*asked on March 10, 2009* -
## Social Studie's

Name 3 thing's that took place during the Renaissance?

*asked on February 2, 2009* -
## 8th grade

Can you unscramble these letters:afsedrniru?

*asked on October 15, 2008* -
## english

could anyone please tell me how i can find out what some ancient rome words mean? thanks!!

*asked on September 13, 2008* -
## Geography

The many islands that stretch from Florida to Venezuela are referred to as the? Thanks!!!!

*asked on April 8, 2008* -
## Geography

what mountain range separates Europe and Asia?

*asked on March 25, 2008* -
## wr

cross word!! (4) letter word for too, too (3) letter word for pen pal Thank you so much

*asked on December 14, 2007* -
## wr

what is a grumpy ocean dweller? (4) letters? ocean greetings? (5) letters? Thank you! Thank you!!1 crossword!

*asked on December 13, 2007* -
## Geography

where is the mouth of the nile river located? Thanks!!1

*asked on December 3, 2007*

## Pages

**1**- 2