Thursday

August 25, 2016
Total # Posts: 1,584

**chemistry**

2.00g of carbonate reacts with excess hydrobromic acid. Use this balanced equation to fond the theoretical yield. Na2Co3 + 2HBr = CO2 + H2O + 2NaBr
*August 16, 2016*

**Algebra**

Where do you insert parenthesis to make this equation true: 3x5+4-2x2+6-4=15
*August 11, 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 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*

**algebra**

3+30
*May 23, 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*