Sunday
July 24, 2016

Posts by jane

Total # Posts: 1,580

Chemistry
The human body obtains 885 kJ of energy from a chocolate chip cookie. If this energy were used to vaporize at 100 degree Celsius, how many grams of water could be vaporized? The heat of vaporization of water at 100 degrees Celsius is 40.7 kJ/mole.
July 20, 2016

Chemistry
The human body obtains 885 kJ of energy from a chocolate chip cookie. If this energy were used to vaporize at 100 degree Celsius, how many grams of water could be vaporized? The heat of vaporization of water at 100 degrees Celsius is 40.7 kJ/mole.
July 19, 2016

Math
The ratio of a triangle's sides is 4:3:6. If the length of the hypotenuse is 1/4, what is the value of the length of the short leg of the triangle subtracted from the length of the long leg of the triangle? Help please?
July 13, 2016

Physics
1, A Body Of Mass 6kg Was Acted Upon By A Constant Force Of 18N. Calc Its Velocity In 5sec. 2. A Car Moving At 108km/hr Was Gradually Brought To Rest By Constant Force Of 2500N After 8sec. Calc The Decelleratio
July 12, 2016

science
what are some examples of a suspension? i need help!!!
July 11, 2016

Math
There are 12 more toy cars than toy trucks in a toy box with a total of 38 toy cars and trucks. How many toy trucks are in the toy box?
July 5, 2016

math
100 meters of fencing is available to enclose a rectangular area next to a river .Give a function that can represent the area that can be enclosed in terms of X
June 28, 2016

Calculus - Discontinuity
Thank you so much for explaining that!
June 27, 2016

Calculus - Discontinuity
I thought that since the limit exists, but does not equal f(3) it would be removable
June 27, 2016

Calculus - Discontinuity
What kind of discontinuity is this piecewise function? Removable or jump? f(x) ={ (2x^2 - 5x - 3)/(x-3) if x does not equal 3 ............6............................if x = 3
June 27, 2016

math
simplyfy if quadratic equation or not quadratic equation and arrange into quadratic equation form 25-r2=4x
June 21, 2016

math
a garden 7m by 12m will be expanded by planting a border of flowers,the border will be of the same width around the entire garden and has an area of 92m
June 18, 2016

PreAlgebra
Leg of 7 km and hypotenuse of 22 km
June 8, 2016

chemistry
lnK = -Ea/R (1/T) + lnA lnK = -111000/8.314 (1/548.15) + lnA so i've tried different things however given im provided with two rate constants and two temperatures im not sure which to use and also i dont have an A value. At first i tried to input one set of data and then ...
June 2, 2016

chemistry
A certain first order reaction has a rate constant of 5.68 x 10–3 s–1 at 139°C and a rate constant of 8.99 x 10–1 s–1 at a temperature of 215°C. Ea = 111 kJ mol– q1) What is the value of the rate constant at 275°C? q2) ...
June 2, 2016

chemistry
oh wait sorry responding to wrong question
June 1, 2016

chemistry
yeah i figured out what was wrong I used that same process the entire time but was converting 275kj wrong i was always out by a factor of 10. haha
June 1, 2016

English
well thank you for trying
May 19, 2016

English
reed can you help please?
May 19, 2016

English
8. which of the following quotes from "the morning of june 281948" best describe the aversion that the public felt toward Shirley Jackson's short story "The lottery" a. "as a matter of fat when I read it over later I decided that except for one or ...
May 19, 2016

Maths -Logarithm
Q) what is the hundreds digit in 3^3^3? What are the steps in simplifying this number? Ty
May 14, 2016

Algebra
What is the value of c so that y=x^2+9x+c is a perfect square trinomial? A. 18 B. 9/2 C. 9/4 D. 81/4 My answer is D.
May 13, 2016

life orientation
Help me gyz plz
May 12, 2016

maths
if expressed in square millimeter what is 25 square meter 2:a football pitch which was originally 80m long had it length increased by 20m if the width of 70 m has remained unchanged what is the difference between the old nd d new perimeter of d pitch
May 9, 2016

life orientation
Youth are the one who create or start a crime,corruption is made by businesses we're by they employ relatives although they a unqualified
May 6, 2016

Math
I still don't get it. Could you explain a little more? Thanks Reiny
April 25, 2016

Math
Let f(x) = x^3 + 3x ^2 + 4x - 7 and g(x) = -7x^4 + 5x^3 +x^2 - 7. What is the coefficient of x^3 in the sum f(x) + g(x)? Thanks.
April 25, 2016

Absolute and relative change
In one region the number of students in Math 101 is 20% more than the number of students in Math 123. If there are 480 students in Math 101, how many students are in Math 123?
April 24, 2016

Absolute and relative change
You are charged $279 on your credit card for a hotel stay, you call to complain about the unexpectedly high charge, but are told there are a total of 24% taxes for hotel rooms where you stayed. What was the advertised price of the room before taxes?
April 24, 2016

life orientation
The right of religion or belief
April 20, 2016

Business
The number of square meters in a square rooms floor area exceed the number of meters in the rooms perimeter by 60.Find the side-length of the room.
April 18, 2016

math
In one month a salesman sold a total of 30 cars and trucks. If three times the number of cars sold equals twice the number of trucks sold, how many trucks did he sell?
April 18, 2016

Life orientation
Substance abuse
April 17, 2016

life orientation
Describe the three human rights violation or discrimination you selected. And give at least two examples of such violation or discrimination
April 17, 2016

l.o
Offender will doubt themselves when it comes to building their own career
April 15, 2016

math
Find all x such that x^2+5x<6. Express your answer in interval notation. Thank you!
April 15, 2016

math
Find p such that px^2-12x+4=0 has only one solution. Thank you!!!
April 14, 2016

life orientation
We must treat one another equally and with dignity we are all Africans and humans after all
April 14, 2016

life orientation
I dnt know any answer
April 14, 2016

life orientation
Hlp me gyz
April 12, 2016

interest
Bryan invests $500 in an account earning 4% interest that compounds annually. If he makes no additional deposits or withdraws, how much will be in the account: About how long would it take to double his $500 investment? Round to one decimal place.
April 10, 2016

Math/Algebra
Let f(x) = (3x - 7)/(x + 1). Find the inverse f^(-1)(x).
April 9, 2016

Physics
An ocean liner leaves New York City and travels 26.9 ° north of east for 217 km. How far east and how far north has it gone? In other words, what are the magnitudes of the components of the ship's displacement vector in the directions (a) due east and (b) due north?
April 7, 2016

Physics
A 66-kg water skier is being pulled by a nylon (Young's modulus 3.7 x 109 N/m2) tow rope that is attached to a boat. The unstretched length of the rope is 20 m and its cross-section area is 2.8 x 10-5 m2. As the skier moves, a resistive force (due to the water) of ...
March 23, 2016

Trig identity.
I need help with verifying these trig identities: 1) sin4x = 4sinxcos - 8sin^3 x cos x 2) cos3x = cos^3 x - 3sin^2 x cos x
March 15, 2016

Trig help
Can someone help me find ALL solutions in the interval [0,2π) for the given equations. Please show work. 1) sin2x = sin2x 2) tan2x +tanx = 0
March 15, 2016

chemistry
how many grams of Zn metal would you use to prepare 6.8g of zinc chloride according the reaction: Zn(s)+2HCl(aq)-> ZnCl2(aq)+H2(g)
March 9, 2016

chemistry
how many grams of Zn metal would you use to prepare 6.8g of zinc chloride according the reaction: Zn(s)+2HCl(aq)-> ZnCl2(aq)+H2(g)
March 9, 2016

trig
Find all solutions in the interval [0,2π) for cos(x - π/6) = 1 + cos(x + π/6). Show work, please and state in solution set.
March 8, 2016

Trig please
The height h in inches of pistons 1 and 2 in an automobile engine can be modeled by h1 = 3.75sin(733t) + 7.5 and h2 = 3.75sin[733(t+ 4π/3)] + 7.5 where t is measured in seconds. How often are these two pistons at the same height? Show work please.
March 8, 2016

Trig
Given sin= -√5/6 with π < u < 3π/2 and cos v= √3/5 with 0 < v < π/2 find sin(u-v) and tan(u+v). Please show work and simplify.
March 8, 2016

Trig application
A man is holding a gun 4 feet above the ground and fires into an open field. The bullet has an initial velocity of 300 feet per second and an initial angle of 30°. Find the range (the horizontal distance traveled before hitting the ground ) and the bullet's max height...
March 4, 2016

Trig application
I'm having trouble with this trig application. The scenario goes: A ferris wheel has a diameter of approximately 65 meters. Assume it takes 110 seconds for the ferris wheel to make one complete rotation. find the angular speed of the ferris wheel in radians per minute and ...
March 3, 2016

triggggg help
Please help me find all solutions in the interval [0, 2π) for these equations: 1) sin^2 x cos x = 4 cosx 2) 1 - cos x = √3 sinx I need help.
March 3, 2016

Calculus
A rectangle is bounded by the x-axis and the semicircle y = sqrt(36-x^2). What length and width should the rectangle have so that its area is a maximum? I understand that 2xy = A and that 4x + 2y = P, but I'm not sure how to solve for a variable to plug back into the ...
March 2, 2016

english
dyslexia-'please describe a typical reaction'
February 19, 2016

Health and Physical Ed
oxygen...is right
February 19, 2016

Trig application
Can anyone help me with this problem? I'm so confused. Please help. A security camera is placed 27 feet from the counter at a store. The counter is 18 feet long and the camera is placed 4 feet from one end. What angle, to the nearest degree, should the camera rotate ...
February 16, 2016

Trig identity inverses
Thanks so much! I'm starting to get it. :)
February 16, 2016

Trig identity inverses
Find the exact value of cos[cot^-1 (-√3) + sin^-1 (-1/2)]. I'm having trouble with inverses. Please help by showing work.
February 16, 2016

Physics
A stone is thrown vertically upward at an initial speed of 10m/s. Find the total time of the flight and the maximum height reached by the stone.
February 8, 2016

Physics
A tennis player throws a tennis ball vertically up with an initial velocity of 50m/s. Another player catches the ball after 0.43s. Find the time upward, time downward, and the vertical distance upward.
February 8, 2016

Science
If a crate with 350N is pulled so that the crate slides at a constant velocity what is the friction force?
February 1, 2016

Health and social Care
What is the meaning of Promoting choice and an example of how this empowers service users? And why is it important to take individual circumstances into consideration when planning care that will empower service users? ( in a nail painting activity; link back to first question...
January 31, 2016

Science
thank you! it's inorganic sources.
January 30, 2016

Science
Organisms designated autotrophs obtain their energy from: other producers. dead consumers. decomposers. inorganic sources. i think it's all of these.
January 30, 2016

triggggg help
Let cos 67.5° = [√(2(+√2)]/2, find tan 67.5°. Show work and simplify. I'm not too sure if i'm doing this correct. I know that the given is cos 67.5° = [√(2(+√2)]/2 sin^2 x + cos^2 x = 1 x=67.5° sin^2 67.5° + cos^2 67.5°...
January 28, 2016

Please help me with trig.
One more problem.. Given sin t= 3/11 and cos t<0, find the values of the remaining 6 trig functions.
January 27, 2016

Please help me with Trig
Given cos 67.5° = [√(2+√2)]/2, find tan 67.5° , simplify where needed, and show work. I'm starting to learn this stuff, and I'm so confused where to start. I know they gave me the coordinate X as in cos 67.5° = [√(2+√2)]/2, and I ...
January 27, 2016

organic chemistry
I can't get the answer. Can anyone help?
January 17, 2016

organic chemistry
m/mm* n(H+) + [HCl] * Va*n(+)+) = [NaOH]*Vb*n(OH) 0.68g/mm*2 + [0.02M]*0.025L*1 = [0.5M]*0.03L*1 PO4=mol
January 17, 2016

organic chemistry
0.68g of a solid diprotic acid was dissolved in 30.0mL of a 0.50 NaOH sol'n. the resulting mixture was then back-titrated against 0.20 M HCl; 25mL were required. Calculate the molar mass of the acid. This acid is a solid salt of a triprotic acid, identify this acidic salt.
January 17, 2016

Physics
An object moves with acceleration given by a = -6t^3 m/s^2. Its initial velocity at t = 0 is 5 m/s. How far will it move before stopping? ((((((The answer is " 7.5 m " ))))) Can you please show me the solution.
January 13, 2016

machanics
show that theoretically the period of rotation of a satelite which circles a planet of negligible distance firm its surface depends only on the density of the planet
January 12, 2016

MATH
In still water, a speed boat travels 5 times faster than the current of the river. If the speed boat can travel 48 miles upstream and 10 back in 5 hours, find the rate.
January 7, 2016

Maths
Ainsley’sandCaleb’sapartmentbuildingsareexactlythesameheight. Ainsley measures the distance between the buildings as 51 m and observes that the angle of depression from the roof of her building to the bottom of Caleb’s is about 64°. How tall, to the nearest ...
December 16, 2015

Maths
Ainsley’sandCaleb’sapartmentbuildingsareexactlythesameheight. Ainsley measures the distance between the buildings as 51 m and observes that the angle of depression from the roof of her building to the bottom of Caleb’s is about 64°. How tall, to the nearest ...
December 15, 2015

Maths
To use an extension ladder safely, the base must be 1 m out from the wall for every 2 m of vertical height. a) What is the maximum angle of elevation, to the nearest degree, to the top of the ladder? b) If the ladder is extended to 4.72 m in length, how high can it safely ...
December 15, 2015

Structures
Thank you so much!
December 13, 2015

Structures
A wood column is 5.5 in. square in cross section and 12 ft long. Its modulus of elasticity is 1.3 × 106 psi. How much will the column shorten under a compressive load of 36,000 lb?
December 13, 2015

Chemistry
You have to consider if it hydrogen-bonds with water. The stronger the H-bonding is, the higher the boiling point will be.
December 7, 2015

Math
Jeff and his friend each text four classmates about a concert. Each classmate then text four students from another school about the concert. If no one receives the message more than once, how many students from the other school receive a text about the concert.
December 2, 2015

Computer Science
i Need help, using loops, visual studio 2013. write a program using loops that will calculate the following, how much would $24 deposited in a bank in 1626, have been worth at the end of this year if it had received an interest rate of 6% compounded annually compounded ...
December 1, 2015

math
Thank you very much Damon :)
November 16, 2015

math
A cyclist travels for 60km at x km/h and 180km at y km/h and takes 10 hours altogether for the journey. If the speed are interchange, the journey takes 8.6 (8 whole number 2 over 3) hours. Find x and y.
November 16, 2015

physics
The AM frequencies of a radio dial range from 550 kHz, and the FM frequencies range of 88.0 MHz to MHz. all of these radio waves travel at a speed of 3.0x10^8 m/s, what are the wavelenght ranges of a.) the aM brand b.) FM brand
November 14, 2015

Phsyics
You place a 6.9 kg television set on a spring scale. The acceleration of gravity is 9.8 m/s2 . If the scale reads 75.43 N, what is the ac- celeration of gravity at that location? Answer in units of m/s2.
November 6, 2015

Chemistry
Calculate the grams of a product that is produced when there is 23 gms of each product Al2O3
November 6, 2015

algebra
The numerator of a fraction , equivalent to 3/4, is increased by an amount so that the value of the resulting fraction is 5/2. Find amount that the numerator is increased.
October 29, 2015

college algebra help******
The answer that nia1598 has provided is wrong!!!!
October 28, 2015

Pathways to Math Literacy
Mike is putting up a snow fence on the west side of his property. He needs a post at each end to hold the fence up and would like to put a post in every 8 feet. If he uses 25 posts for his fence, how wide is the west side of his property?
October 26, 2015

History
Thank you!
October 23, 2015

History
Which answer best explains the contributions of women during the revolutionary war? Women only openly supported the British side during the Revolutionary War, as they feared for their lives while their husbands were away fighting Many women enlisted as soldiers, as was allowed...
October 23, 2015

math
Given BE = 11, EA = 11, BD = 7, and DC = 7, show that BED ~BAC
October 21, 2015

P6 maths
40% of Amy's stamps is equal to 75% of Mary's stamps. After Mary has given 25% of her stamps away , Amy has 90 more stamps than Mary. Find the total number of stamps they have at first
September 25, 2015

physics
The thermal energy stored in 1 kg of gasoline is about 10,000 kcal (42,000,000 J). A small car needs a forward force of about 500 N to move slowly at a constant speed on a leveled road (no change in ME). How far should the car go if all the energy stored in 1 kg gasoline is ...
September 18, 2015

8th grade math
I need help solving this problem. y=14-1/32x. Y is the number of gallons fuel in tank, x is the number of miles driven. tank contains 8.5 gallons of fuel. y=8.5 8.5=14-1/32x
September 17, 2015

Math
Mrs.Cress's table measures 5 ft wide and 8 ft long. She wants to cover the table with 3 in squares tiles. How many tiles will she need?
September 15, 2015

Math
The following are probabilities of selecting items from a bag. What is the probability of selecting other? Jolly rancher: 1/6 Gum: 2/7 Twizzlers: 1/3 other: ?
September 8, 2015

Algebra
(5)^-1/2 * (5x)^5/2 (5x)^-3/2 Simplifies to 1/5 * ã5x^5(1/ã5x^3) My final answer is x/ã5 is that correct?
August 21, 2015

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