# Posts by roy

Total # Posts: 136

**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?

**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 try again and it was 2....

**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?

**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? A. 20 m/s B. 30 m/...

**physics**

the weight is evenly distributed so half of the N per rope. undo the weight which is massx9.80 by taking the mass divided by 9.80 then add acceleration to the acceleration of the earths gravity (fg=9.80) so that it looks like this; mass x (fg + a) then devide in two so each ...

**geometry**

Roy, Aaron, and Pete are given three identical rectangular blocks. They slice their blocks in different ways to get two equal halves. The resulting cross section in each of the three blocks is a .

**algebra**

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

**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

**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 +4x-60=whatever. But I...

**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

**Physics**

T=1.5 s?

**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

**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 different from a confederation.

**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

**science**

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

**PHYSICS**

Any hint for b? and c?

**PHYSICS(help)**

@Pete c) How do we deduce how far back the block moves with te energy difference obtained?

**calculus**

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

**calcus**

int sec u du

**calcus**

int tan^3xsec^3x dx

**calcus**

int cosxsinx dx

**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

**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 maximum.(a)T/8(b)3T/8(c)3T/4(d)T/2

**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

**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 between 1.26 and 3.84

**maths**

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

**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

**calculus**

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

**calculus**

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

**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

**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

**Math**

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

**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. (is,are)Despite the ...

**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) ] Find values of x and y...

**math**

what is the formula for working out open cuboid.

**math**

what is the formula for working out open cuboid.

**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

**physics**

the key is "net force". in both cases acceleration is zero. therefore net force is also zero. Newton's second law, Fnet = mass * accel

**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?

**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

**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........

**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.

**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?

**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?

**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.

**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.

**Trigonometry**

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

**geometry**

4X Over 30

**linear math**

8x + 6y = -15

**Math**

16

**science(chem)**

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

**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 the ...

**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.

**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. Amount of anhyrdate...

**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?

**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.

**algebra**

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

**Biology**

b protien

**Chemistry**

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

**English (Essay)**

Indent you paragraph. I think I understnad what you are trying to say when you say helpless individuals but it makes you sound as though you are obliterating there rights. I don't think that most of your words are biased, I think they are descriptive and I think that is ...

**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 square meters.

**Microeconomics**

When is international trade an opportunity for workers?

**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 acquisition will cost $...

**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 given, are you able to ...

**science**

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

**math**

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

**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 least two decimal places...

**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.

**math**

if 2/5 of my money is $4.00 how much is 1/2 of my money.

**math**

if 2/5 of my money is $4.00 how much is1/2 OF MY MONEY

**C++**

int x; char* y,z; cout<<"Please enter number: "<<endl; cin>>x; if (x<20) y[x-1]={"one","two",...,"nineteen"}; else if((x/10)==2) z[x%10]={"one","two",...,"nine"}; y[]={"twenty - &...

**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].)

**algebra**

11b,6=b-5

**algebra**

3/x-5=10/x+2

**math**

3 10 ____ = ____ x-5 x+2

**Pre-Calc**

Thank u both

**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

**Pre-Calc**

Thank you mathmate

**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)

**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)

**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)

**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...

**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).

**Geometry**

If you have 4 pencils, and I have 7 apples, how many pancakes will fit on the roof? Answer: Purple, because aliens don't wear hats.

**advanced algebra**

Q. x^-4/5=16 What is x Q. Suppose 0<a<1. Arrange the following from smallest to largest z^-a,z^a,z^1/a,z^-1/8.

**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?

**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?

**social studies**

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

**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

**Fractions**

I'm pretty sure its 4

**Physics**

It says it itself: drum diameter = wavelength for 18.5kHz wavelength = V/f = 330/18500 (metres) or 1.78 cm

**math**

143

**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.

**math**

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

**math**

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

**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

**english**

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

**english**

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

**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