Wednesday
December 17, 2014

Posts by John


Total # Posts: 6,387

math
Janet took a standardized test that contained 328 questions. She answered 75% of the questions. How many questions did she answer?
September 19, 2012

Math
Add the fractions 1/3, 5/6, and 3/8 and reduce your answer to the lowest terms.
September 19, 2012

chemistry
Calculate the amount of heat required to heat a 3.7{\rm kg} gold bar from 30^\circ {\rm C} to 61^\circ {\rm C}. Specific heat capacity of gold is 0.128 \rm J/g ^\circ C
September 19, 2012

physics
A train is moving parallel and adjacent to a highway with a constant speed of 25 m/s. Initially a car is 49 meters behind the train travelling in the same directionas the train at 37 m/s and accelerating at 4 m/s^2. What is the speed of the car just as it passes the train.
September 18, 2012

physics
A nurse pushes a cart by exerting a force on the handle at a downward angle 35.0º below the horizontal. The loaded cart has a mass of 28.0 kg, and the force of friction is 60.0 N. (a) Draw a free-body diagram for the system of interest. (b) What force must the nurse exert...
September 18, 2012

Math
Verify that y=e^abs(x) is a solution to y'-y={-2e^-x, x<0 {0, x>= 0 on each of the intervals (-infinity,0) and (0, infinity).
September 18, 2012

Math
Verify that y=e^abs(x) is a solution to y'-y={-2e^-x, x<0 {0, x>= 0 on each of the intervals (-infinity,0) and (o, infinity).
September 18, 2012

physics
3.45
September 18, 2012

Probability and statistics
how much will the squirrel expect to have
September 18, 2012

Math
Please help I have no Idea what to do here. A box with an open top is to be constructed by cutting a-inch squares from the corners of a rectangular sheet of tin whose length is twice its width. What size sheet will produce a box having a volume of 420 in^3 when a = 3?
September 18, 2012

math
12p - 3 - 17p + 42
September 18, 2012

math/trig
A flagpole casts a shadow 44 ft with the sun angle of elevation is 60.5 degrees. Find the height of the flagpole and at what angle is the shadow twice as long?
September 17, 2012

math/trig
A 16 ft ladder casts a shadow 44 ft with the sun angle of elevation is 60.5 degrees. Find the height of the flagpole and at what angle is the shadow twice as long?
September 17, 2012

Math
Rounded to the nearest 10 I am 12750
September 17, 2012

algebra
hey i was wondering if u could tell me the right answer to this problem..ty the product of 2 and the sum of 5 and k i think its either 2(5+k) or 2x(5+k)
September 17, 2012

calculus *astroid*
Everything is so easy once you know how to work around it! Thanks again Steve.
September 17, 2012

calculus *astroid*
THe equation x^2/3 + y^2/3 = 4 describes an astroid. Determine the length of the astroid by finding the length of a portion of it,found in the first quadrant, being y = (4-x^2/3)^3/2 for 0<x<8 and multiplying that valor by 4.
September 17, 2012

calculus *improper integrals*
I see how it makes sense now, thanks a lot Steve!
September 16, 2012

calculus *improper integrals*
yes , the hole goes through the sphere, centered along the diameter
September 16, 2012

calculus *improper integrals*
A hole of a radius of 1cm is pierced in a sphere of a 4cm radius. Calculate the volume of the remaining sphere. I know that the volume of a sphere with an exterior radius is of: V = pie(R^2 - r^2) dH where R^2 is the exterior surface area and r^2 is the interior surface area. ...
September 16, 2012

college algebra
to travel 132 miles it take sue riding a moped 2 hours less time then it takes doreen to travel 56 miles riding a bike. sue travels 15 miles per hour faster then doreen find the time and rates
September 16, 2012

Chemistry
I've tried to solve this question multiple ways I just can't seem to get it. I just don't understand what I should be doing. An organic liquid is a mixture of methyl alcohol () and ethyl alcohol (). A 0.220- sample of the liquid is burned in an excess of and yields...
September 16, 2012

Chem
what is the pH of solution made by mixing 100 mL of 0.030M HCL with 200 mL water?
September 16, 2012

calculus
A hole of a radius of 1cm is pierced in a sphere of a 4cm radius. Calculate the volume of the remaining sphere. I know that the volume of a sphere with an exterior radius is of: V = pie(R^2 - r^2) dH where R^2 is the exterior surface area and r^2 is the interior surface area. ...
September 15, 2012

PHYSICS
The engine of a 1250 kg car provides a forward directed force of 3,560 N. If the car accelerates at a rate of 2.60 m/s2, what is the total resistive force (wind resistance, friction, etc.) acting on the car?
September 13, 2012

English - Early American Lit (NEED ASAP)
Yeah I looked them up for number 2. That's why's B. Have you looked up the titles for number 2?! So... pretty much you commenting told me nothing I didn't knw already. I didn't ask for links. I asked for letters... like A,B,C,D.. it's our alphabet if you ...
September 13, 2012

English - Early American Lit (NEED ASAP)
2. B
September 13, 2012

English - Early American Lit (NEED ASAP)
My answers so far: 1.A 2.C Not sure if they are correct
September 13, 2012

math
complete the tables so that the ratios are equivalent i don't understand 10 | | 27 40 | 36 | 54 | 72
September 12, 2012

physics
An electron in the cathode ray tube of a tele- vision set enters a region where it acceler- ates uniformly from a speed of 53800 m/s to a speed of 4.58 × 106 m/s in a distance of 2.82 cm. What is its acceleration? Answer in units of m/s2
September 11, 2012

Science
How many mL of 80% v/v ethanol do you need to make 200 mL of a 50% ethanol solution in water?
September 11, 2012

math
eddie is thinking of a number between 149,000 and 150,000 his number has a tens digit that is 7 more than its ones digit. The sum of the tens and ones digit is 9 the sum. the hundreds digit is 0 what is eddies number
September 6, 2012

Science
How may 1.5 Liter water capacity diving cylinders can I fill to 200 bar from a 50 liter water capacity storage cylinder filled to 200 bar,leaving 25 bar in the storage cylinder, using a booster pump?
September 6, 2012

AP Physics
whta
September 5, 2012

chem
Hint: Remember that reactions happen in moles. So figure out the moles that reacted then use the molarity formula to continue solving the problem. What volume of 0.699 M K3PO4 is required to react with 68 mL of 0.661 MMgCl2 accord- ing to the equation 2K3PO4 + 3MgCl2 ! Mg3(PO4...
September 5, 2012

chemistry
109 mmHg
September 4, 2012

math
if the reciprocal of the opposite of a number, x, is equal to 9 times the opoostie of the number, then the number could be?
September 3, 2012

math
a=7-3a. for example 2=7-3(2)=1. if 6-x=2-x, find the value of x. the problem i am having is that the first a is in a square box and the first 2 is in a squre box. so does 6 and -x in a square box. I am not sure what the boxes represent?
September 3, 2012

math
In bowling, a handicap is determined by subtracting your bowling average from 180 and then finding 80% of this difference. Freddie bowls games of 178, 156, 149, 155, 172 and 180. Freddie's handicap is__________. I came up with 12. Could you check if this is correct please...
September 3, 2012

math
what if the options are 4, 16, 25, 36, 64. How would the answer is going to change? I think the answer is 64. could you tell me if the 64 is the right answer?
September 3, 2012

math
could you explain to me how to solve it please?
September 3, 2012

math
If a cube is sliced into equal sized smaller cubes, which quantity of smaller cubes could be attained? a)4 b)16 c)1/4 d)-1/5 e)1
September 3, 2012

math
thank you!!
September 3, 2012

math
4'x4'x8'
September 3, 2012

math
a cordof wood stacked as a rectangular solid measures 4"x4"x8". How many cubic feet are in 3/4 this fo a cord?
September 3, 2012

Science
what is the atomic symbol for the element chronium
August 31, 2012

John
For a small molecule with a diffusion coefficient of 10^-6 cm2/s, how far would it diffuse after flowing over 1 cm at a flow rate of 10 cm/s?
August 31, 2012

Business and math question
I REALLY DON'T KNOW
August 30, 2012

Business and math question
Isabella is hoping to get an A on her college algebra course. With just the final exam left to take, she currently has an average of 92 on her exercises. The quizzes count for 40%, exercises count for30% of the class grade. What is the minimal grade that Isabella must have on ...
August 30, 2012

Business
Robert recently was hired as a technician in the firm. He is being paid $1,250 every two weeks ( after taxes). His monthly bills are: Rent: $900 electricity: $110 car payment: $350 car insurance: $60 fuel for cars: $90 groceries: $180 credit cards: $250 Given Robert's ...
August 30, 2012

Business
CAN ANYONE ANSWER THIS QUESTION
August 30, 2012

Business
Isabella is hoping to get an A on her college Algebra course. With just the finaL exam left to take, she currently has an average of 85 on her quizzes and average of 92 on her exercises. The quizzes count for 40%, exercises count for 30% of the class grade. What is the minimal...
August 30, 2012

Business
A basic car rental charges a daily rate of $29 a day plus $.20 a mile. Suppose that you rent a car for a day and your bill ( before taxes ) is $79. How many miles did you the car.
August 30, 2012

math
please help me I need to finish this so that I can go into grade 11. A new water tower must be equidistant from three communities. They are located at (-25, 20) (-5, -40) and (15, 30). Find the coordinates of the point where the water tower should be built which i am assuming ...
August 29, 2012

Lockers
I'm starting middle school and during the orientation they let us try out our lockers with our combination. I couldn't open it so my parents just told me that I would learn during school. It's the 3rd day and I still can't open it that good. Can anyone help me? D:
August 29, 2012

math
please help me I need to finish this so that I can go into grade 11. A new water tower must be equidistant from three communities. They are located at (-25, 20) (-5, -40) and (15, 30). Find the coordinates of the point where the water tower should be built which i am assuming ...
August 29, 2012

math
Find the inverse of an invertible function f(x). Use the figure to find the following: ƒ−1(-2)= ƒ−1 (-1)= ƒ−1(0)=
August 29, 2012

chemistry
the density of water at 40c is 0.992g/mL. what is the volume of 1.95 of water at this temperature
August 28, 2012

Algebra
Discuss the relationship between the FOIL method for multiplying polynomials and the distributive property of multiplication.
August 28, 2012

College Physics
I keep getting answer wrong. I don't know what I did wrong. I really need help please. I need help with 1 question. Can you help with this please if you don't mind? 1) Suppose you are given that z = c y^3/x^2 where c is some number. For a particular value of c, x and y...
August 26, 2012

MATH
A company sells cardboard that is thick. Write an equation to solve for the number of sheets of cardboard, c, in a pile that is thick. What must be done to both sides to solve the equation?
August 24, 2012

MATH 5TH GRADE (VARIABLES AND EXPRESSIONS)
123
August 23, 2012

Physics
A man walks with an average speed of 1.3 m/s for 45 minutes. How far has he walked?
August 23, 2012

Geometry
If the size of a rectangle's area is twice as large as the size of it's perimeter, and the length of one of its sides is 4.5, what is the length of the other side?
August 22, 2012

Geometry
The area of a 300' by 400' rectangle is doubled by adding a strip of width around the perimeter. Approximately how wide is that strip?
August 22, 2012

math
A pendulum bob swings 6.0 cm on its first oscillation. On each subsequent oscillation the bob travels 1/3 of the previous distance. Find the total distance the bob travels before coming to rest.
August 22, 2012

English 125 introduction literature
major similarities and differences between the forms of drama, poetry, and the short story.
August 20, 2012

Physics
It's really 1 F 2 A 3 F 4 C I just did the assignment
August 19, 2012

physics
why it is easier to tear a paper towel off a full roll than a mostly used one?
August 17, 2012

Math
To open the chest of shells the souvenir merchant must enter a code. As his memory is poor, to remember the code he has filled in this speech bubble so that every statement is correct. What is the code? ? X number 1, ? X number 2, ? X number 3, ? X number 4. The multipliers ...
August 16, 2012

algebra 2
t-9(t+11)
August 13, 2012

Chemistry
A metal element (M) forms a hexadentate complex with the ligand ethylenediammine (en). Its formula is M(en)32+. The metal ion and the ligand do not absorb in the visible region of spectrophotometer and a 1.00 cm cuvette, the following absorbances were measured for various ...
August 13, 2012

math
how do you put 1/4,2/3,-7,8,-9 in order
August 12, 2012

math
3260
August 8, 2012

science
A chair of mass 15.5 is sitting on the horizontal floor; the floor is not frictionless. You push on the chair with a force = 38.0 that is directed at an angle of 42.0 below the horizontal and the chair slides along the floor.Use Newton's laws to calculate the normal force ...
August 3, 2012

math
Find the remainder when 1!+2!+...+299!+300! is divided by 21
August 1, 2012

math
Noting that 247=(13)(19), find the remainder when 13^18+19^12 is divided by 247
August 1, 2012

number theory
Find the remainder when 1!+2!+...+299!+300! is divided by 21
August 1, 2012

number theory
a) Find the last two digits(units and tens digit) in 1829^(1829) b) Find the units digit in 23^(7777)
August 1, 2012

number theory
Find the remainder when 1!+2!+...+299!+300! is divided by 21
August 1, 2012

number theory
Find the least positive integer that leaves the remainder 3 when divided by 7, remainder 4 when divided by 9, and remainder 8 when divided by 11
August 1, 2012

math
65.25 is 25% of what number
August 1, 2012

Physics
A police car traveling at 94.5 km/h is traveling west, chasing a motorist traveling at 77.2 km/h. (a) What is the velocity of the motorist relative to the police car? The magnitude and its direction (b) What is the velocity of the police car relative to the motorist? The ...
August 1, 2012

Math
Yes! Thanks!
July 31, 2012

Math
If xΩy is defined as the smallest integer of which both x and y are factors, then 10Ω32 is how much greater than 6Ω20?
July 31, 2012

Math
The null and alternate hypotheses are: H0: π1 ≤ π2 H1: π1> π2 A sample of 100 observations from the first population indicated that X1 is 70. A sample of 150 observations from the second population revealed X2 to be 90. Use the .05 significance ...
July 24, 2012

math
A river has a current of 4 mph. Find the speed of Simon’s boat in still water if it goes 40 miles downstream in the same time as 24 miles upstream.
July 23, 2012

Finance
why a firm might deviate from the matching principle by financing short-term assets with long-term debt. How would such a policy have affected a firm during the financial crisis?
July 23, 2012

math
Amy can clean the house in 7 hours. When she works together with Tom, the job takes 5 hours. How long would it take Tom, working by himself, to clean the house?
July 23, 2012

math
john takes 3hours longer than andrew to peel 400 pounds of apples. if together they can peel 400pounds of apples in 8hours then how long would it take john if he is working alone.
July 23, 2012

math
Frank can type a report in 4 hours and James takes 6 hours. How long will it take the two of them typing together?
July 23, 2012

math
A cyclist bikes at a constant speed for 18 miles. He then returns home at the same speed but takes a different route. His return trip takes one hour longer and is 23 miles. Find his speed.
July 23, 2012

math
The speed of a stream is 6 mph. If a boat travels 52 miles downstream in the same time that it takes to travel 26 miles upstream, what is the speed of the boat in still water?
July 22, 2012

Statistics
Suppose you and a friend each take different random samples of data pairs (x,y) from the same population. Assume the samples are the same size. Based on your samples, you compute r=0.83. Based on her sample, your firmed computes r=0.79 Is your friends value wrong? Explain?
July 21, 2012

Math( Geometry)
All three planes in the figure provided are parallel. They are cut by lines containing points A, B and C and X, Y and Z. Each of these points lies in a plane. If BC=8 cm, YZ=10 cm and XY=14 cm, find AB. A.)10 1/2 cm B.)10.2 cm C.)11 1/5 cm
July 14, 2012

Geometry
12x?
July 14, 2012

Foreign languages
Writeacher, do you know anything about English conversation lessons on Skype? Can you please suggest sites which offer online conversation courses? Thank you for your invaluable help! My sister would like to take one-hour conversation lessons every two days with an English ...
July 13, 2012

Foreign languages
Can you check these sentences, Writaecher? 1) Can you please tell me how far ...... hotel is from the beach? 2) As a matter of fact, I was looking for a hotel on a seafront. Do you think I should opt for the ..... Hotel?
July 13, 2012

math
The times for completing one circuit of a bicycle course are normally distributed with a mean of 81.7 minutes and a standard deviation of 8.6 minutes. An association wants to sponsor a race and provide prizes for the top (that is, fastest) 15% of riders. Where should they ...
July 12, 2012

Foreign languages
Can you please check these sentences, Writeacher? 1) I would like to book a room with a double bed and a single bed (at a certain price) for person (sharing) which (alsoincludes breakfast and dinner for seven nights. (Can you help me express this sentence better?) 2) Prior to ...
July 11, 2012

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