Tuesday

October 21, 2014

October 21, 2014

Total # Posts: 539

**chemistry**

calculate the dimensions of a cube that contains 22.4L of gas at STP.
*February 10, 2013*

**Algebra 2**

Yes thank you!
*January 26, 2013*

**Algebra 2 **

How would you solve the following I'm stumped.. 1. 2x^2(squared)=30-4x 2. X^3(cubed)+8x=-6x^2(squared) Thanks!
*January 26, 2013*

**Algebra 2 **

Tickets to the school musical cost $3 for students and $5 for non students. Total ticket sales were $1790. The number of student tickets sold was 100 less than twice the number of non student tickets sold. Write a system of equations to represent this situation. Solve the ...
*January 22, 2013*

**MATH HELPPPPPPP**

Noah and Brianna want to calculate the distance between their houses which are opposite sides of a water park. they mark a point, A, 150 m along the edge of the water park from brianna's house. the measure ÚNBA as 80‹and ÚBAN as 75...
*January 15, 2013*

**math(ASAP HELP)**

7. two paths diverge at a 48 degree angle. two mountain bike riders take seperate routes at 8km/hr and 12 km /hr.how far apart are they after two hours? 8. Draw a diagram to solve this problem: Ajax is 10 km due west of Oshawa. Uxbridge is 18 km NW of Oshawa. How far is it ...
*January 15, 2013*

**Math**

Solve each inequality by using algebra. 24. x 2 - 11x + 13 ≤ 25 25. -2x 2 + 3x + 4 ≥ -1 26. x 2 - 5x - 4 < -9 27. Sports A football thrown by a quarterback follows a path given by h(x) = -0.0095x 2 + x + 7, where h is the height of the ball in feet and x is the ...
*January 7, 2013*

**College Chemistry**

Is .1M NaH2PO4 a good buffer? Explain.
*December 6, 2012*

**Math**

Are drawing a black and red card independent or mutually exclusive? Are drawing a black card and queen independent? Are drawing a face card and queen independent?
*December 2, 2012*

**Probability**

Can someone please help me? certain medical diagnostic test is used to determine if people have pinkyitis and it is known that 1 in 1300 Americans has the disease. The test correctly diagnoses the presence of pinkyitis 97% of the time and it correctly diagnoses the absence of ...
*December 2, 2012*

**Probability**

Can someone please help me. A single card is selected from a standard 52-card deck. B= the drawn card is black; R= the drawn card is red; Q= the drawn card is a queen; F= the drawn card is a face card ( a king, queen or jack). Without finding the probabilities, determine if B ...
*December 2, 2012*

**math**

Magnus purchased a car for $35,865. It depreciates about 3.6% each year. What is the value of the car after ten years?
*November 30, 2012*

**pre cal**

For a given right triangle, angle B = 46± and side c = 30 feet. What is the length of side a to the nearest foot?
*November 30, 2012*

**pre calculus**

For a given right triangle, angle A = 61± and side b = 39 feet. What is the length of side a to the nearest foot?
*November 30, 2012*

**pre calculus**

For a given right triangle, angle A = 61± and side b = 39 feet. What is the length of side a to the nearest foot?
*November 30, 2012*

**pre calculus**

For a given right triangle, side a = 76.4 feet and side b = 39.3 feet. What is the length of side c to the nearest tenth of a foot?
*November 30, 2012*

**pre calculus**

For a given right triangle, side a = 76.4 feet and side b = 39.3 feet. What is the length of side c to the nearest tenth of a foot?
*November 30, 2012*

**pre calculus**

For a given right triangle, angle B = 46 degrees and side c = 30 feet.What is the measure of angle A to the nearest degree?
*November 30, 2012*

**pre calculus**

For a given right triangle, side a = 490 feet and side b = 960 feet. What is the measure of angle B to the nearest degree?
*November 30, 2012*

**pre calculus**

For a given right triangle, side a = 400 feet and side b = 900 feet. What is the measure of angle B to the nearest degree?
*November 30, 2012*

**pre calculus**

For a given right triangle, angle A = 61± and side b = 39 feet. What is the length of side c to the nearest foot?
*November 30, 2012*

**pre calculus**

For a given right triangle, side a = 400 feet and side b = 900 feet.What is the measure of angle A to the nearest degree?
*November 30, 2012*

**pre calculus**

For a given right triangle, angle B = 46 degrees and side c = 30 feet.What is the length of side b to the nearest foot?
*November 30, 2012*

**Pre Calculus**

For a given right triangle, side a = 76.4 feet and side b = 39.3 feet. What is the measure of angle A to the nearest degree?
*November 30, 2012*

**science**

What is the alleles of pea pot parents and the possible allele combinations of the offspring. Both parents are tall and 3 offsprings are tall while the other one is short. I don't get this! Please help! Thanks!!
*November 27, 2012*

**Physics B**

A(n) 685 N man stands in the middle of a frozen pond of radius 14.6 m. He is unable to get to the other side because of a lack of friction between his shoes and the ice. To overcome this diﬃculty, he throws his 1.3 kg physics textbook horizontally toward the north shore...
*November 12, 2012*

**Physics B**

A(n) 685 N man stands in the middle of a frozen pond of radius 14.6 m. He is unable to get to the other side because of a lack of friction between his shoes and the ice. To overcome this diﬃculty, he throws his 1.3 kg physics textbook horizontally toward the north shore...
*November 12, 2012*

**Physics B**

Part 1 A pitcher claims he can throw a 0.167 kg baseball with as much momentum as a 2.43 g bullet moving with a speed of 87735 m/s. What must be its speed if the pitcher’s claim is valid? Answer in units of m/s Part 2 What is the kinetic energy of the bullet? Answer in ...
*November 12, 2012*

**math**

7 less than 3 times x
*October 27, 2012*

**Ap Chemisty**

If .237 mol of ammonia react with 56g of iodine, how much Nitrogen triiodid, in grams, is produced?
*October 24, 2012*

**Physics.**

A block of mass 3m is placed on a frictionless horizontal surface, and a second block of mass m is placed on top of the first block. The surfaces of the blocks are rough. A constant force of magnitude F is applied to the first block. a) Identify the horizontal force that ...
*October 16, 2012*

**ENGLISH**

1. Which of the following quotations is the best example of a paradox? (1 point)“I’ll drain him dry as hay. . . ” “Lesser than Macbeth, and greater.” “So well thy words become thee as thy wounds. . . ” 2. Which of the following is an example ...
*October 14, 2012*

**math**

What is 548 rounded to the nearest 10
*September 25, 2012*

**math**

Draw a model to represent the following quotient 2 1\2 / 2\3
*September 16, 2012*

**math**

Selena is making cookies. To make one dozen cookies, she needs 2/3 cup of brown sugar. How many cups of brown sugar does Selena need to make 4 1/3 dozen cookies?
*September 16, 2012*

**math**

how many 1/3 inch ribbons can be cut from a piece of ribbon that is 4 and 1/3 inches long?
*September 16, 2012*

**Math**

Find the value of y for a given value of x, if y varies directly with x. If y = –252 when x = 84, what is y when x = 74?
*September 1, 2012*

**Physics**

A speeding car is traveling at a constant 30.0 m/s when it passes a stopped police car. The police car accelerates at 7.0 m/s^2. a)how far will the police travel to catch up to the speeder? b) how fast will it be going when it catches up?
*August 28, 2012*

**Physics**

A speeding car is traveling at a constant 30.0 m/s when it passes a stopped police car. The police car accelerates at 7.0 m/s^2. a)how far will the police travel to catch up to the speeder? b) how fast will it be going when it catches up?
*August 28, 2012*

**Physics**

What are the first, second, and third frequencies audible from a 20 cm long organ pipe when (A) only one end is open and when (B) both ends are open. The speed of sound through the air inside the organ pipe is 343m/s. (Hint: if a harmonic does not exist, it would not be heard.)
*July 10, 2012*

**Precalculus check answers help!**

16. Find the distance between P (–2, 5) and the line with equation x – 3y + 4 = 0. (1 point) 17(sqrt10)/ 10 0 -17(sqrt10)/ 10 13(sqrt10)/ 10 ~ 17. Find the distance between the lines with equations 5x + 12y = 12 and y = –x + 3. (1 point) 24/13 ~ 48/13 -48/13 48/...
*May 31, 2012*

**Precalculus check answers help!**

16. Find the distance between P (–2, 5) and the line with equation x – 3y + 4 = 0. (1 point) 17(sqrt10)/ 10 0 -17(sqrt10)/ 10 13(sqrt10)/ 10 ~ 17. Find the distance between the lines with equations 5x + 12y = 12 and y = –x + 3. (1 point) 24/13 ~ 48/13 -48/13 48/...
*May 30, 2012*

**Precalculus check answers help!**

7.) Write the equation 3x + 4y – 7 = 0 in normal form. 3/5x + 4/5y + 7/5 = 0 -3/5x - 4/5y - 7/5 = 0 -3/5x - 4/5y + 7/5 = 0 ~ 3/5x + 4/5y - 7/5 = 0 8.)Write the standard form of the equation of a line for which the length of the normal is 4 and the normal makes an angle of...
*May 30, 2012*

**Precalculus check answers help!**

is 3 -1? and im not sure what i did on number 1 ? please explain.
*May 30, 2012*

**Precalculus check answers help!**

1.) Find an expression equivalent to sec theta sin theta cot theta csc theta. tan theta csc theta sec theta ~ sin theta 2.) Find an expression equivalent to cos theta/sin theta . tan theta cot theta ~ sec theta csc theta 3.) Simplify (tan^2 theta + 1)/(tan^2 theta) . csc2 ...
*May 30, 2012*

**Precalculus check answers help!**

1. Which expression is equivalent to cos 2theta for all values of theta ? cos^2 theta – sin^2 theta ~ cos^2 theta – 1 1 – 2 sin^2 theta 2 sin theta cos theta 2. Use a half–angle identity to find the exact value of sin 105°. -1/2(sqrt)(2 + Sqrt3) 1/2(...
*May 28, 2012*

**Precalculus check answers help!**

1.) Find an expression equivalent to sec theta sin theta cot theta csc theta. tan theta csc theta sec theta ~ sin theta 2.) Find an expression equivalent to cos theta/sin theta . tan theta cot theta ~ sec theta csc theta 3.) Simplify (tan^2 theta + 1)/(tan^2 theta) . csc2 ...
*May 28, 2012*

**Calculus!**

Which is the standard form of the equation with p = 26, O=3pi/4 ? the O before the =3pi has a diagonal slash through it.
*May 12, 2012*

**Analytic Geometry**

Given two planes, discuss the methods used to determine if the planes are parallel, perpendicular, coincident, or none of these.
*May 10, 2012*

**Physics**

The grindstone, in the shape of a solid cylinder, weighs 80.0 kg, and has a radius of 0.320 m. The coefficient of friction between the axe and the stone is mk = 0.620 m. The radial component of the force of the axe against the grindstone is closest to...
*May 3, 2012*

**Physics**

The grindstone weighs 80.0 kg, and has a radius of 0.320 m. The coefficient of friction between the axe and the stone is mk = 0.620 m. The radial component of the force of the axe against the grindstone is closest to...
*May 3, 2012*

**English**

is a i think thats it
*May 2, 2012*

**English answer check**

since 17 has were in it that would make it subjunctive right?
*May 2, 2012*

**English answer check**

sorry last c wasnt suposed to be there 16=b 17=a 19=c ?
*May 2, 2012*

**English answer check**

15. Which of the following sentences uses the passive voice? Almost every night Frances sang her son the same lovely lullaby. Because of the light color, Jason gave the room a second coat of paint. Have you ever been taken to the state fair? Despite her talent, Ms. O’Neil...
*May 2, 2012*

**Calculus Graph help!!!**

its not that its the graph and i have to figure out the equation... but it wont let me post the picture of the graph.
*May 2, 2012*

**Calculus Graph help!!!**

I need help with a calulus graph and figuring out its equation but it wont let me post the picture of the graphs here. so will someone who understands Calculus and their graphs super well please email me k m k underscore horse lover at hot mail dot com. no spaces and an actual...
*May 2, 2012*

**Algebra 2**

If an object is thrown vertically upward with an initial velocity of v, from an original position of s, the height h at any time t is given by: h=-16t^2+vt+s(where h and s are in ft, t is in seconds and v is in ft/sec) A package is thrown downward with an initial velocity of -...
*April 29, 2012*

**Homework**

The formula for the volume of a cylinder is: V=πr^2*h If the volume is 432 cubic inches and the height is 8 inches, solve for the length of the radius. Round answer to 2 decimals.
*April 29, 2012*

**Math**

Hi! Can you help me with this problem please? thank youu :D The problem is: The figure consists of a square with 4 half circles surrounding it. If the perimeter of the figure is 87 yards, what is the radius of each half circle? What is the area of the square? Round to the ...
*April 25, 2012*

**AP Calculus**

Let R be the region bounded by the x-axis and the graph of y=6x-x^2 Find the volume of the solid generated when R is revolved around the y-axis
*April 22, 2012*

**Chemistry**

I need help ASAP! Colligative Properties- Ethylene glycol (C2H6O2) is the principal ingredient in antifreeze. How many grams of ethylene glycol will be needed to lower the freezing point of 2100 grams of water by 20 degrees celcius?
*April 10, 2012*

**math**

write an equation of an ellipse: Major axis 12 units long and parallel to the y-axis, Minor axis 8 units long, center at (-2,5)
*April 1, 2012*

**physics**

a person attaches a 25kg hay bale to one end of a rope passing over a frictionless pulley connected to a beam in the hay barn. another person then pulls down on the opposite end of the rope with a force of 277-N Ignoring the mass of the rope what will be the magnitude and ...
*March 25, 2012*

**DrBob222**

Everything is right except the system...i put -253.5 and it marked me wrong :(
*March 15, 2012*

**DrBob222**

also I checked this problem and I only got the deltaS(surr)=466.4 J/mol*K correct. Please help
*March 15, 2012*

**DrBob222**

chemistry - Kelsey, Thursday, March 15, 2012 at 1:16am My answer is: deltaS(sys)=654900J/mol*K deltaS(surr)=466.4 J/mol*K deltaS(univ)=655366J/mol*K Sorry I forgot to convert to J also I checked this problem and I only got thedeltaS(surr)=466.4 J/mol*K correct. Please help
*March 15, 2012*

**DrBob222**

I know I posted this but you didn't answer! Please help!!!! Consider the following reaction at 298 K: C(graphite) +2Cl2 (g) -----> CCl4(l) Calculate the following quantities. Delta H: -139 kJ/mol deltaS(sys)=? J/mol*K deltaS(surr)=? J/mol*K deltaS(univ)=? J/mol*K My ...
*March 15, 2012*

**Chemistry**

Yes it is correct! Thanks! :) I see my mistake!
*March 15, 2012*

**Chemistry**

Consider the decomposition of a metal oxide to its elements, where M represents a generic metal. M203(s)---> 2M(s) + 3/2 O2(g) info given for Gf(kJ/mol): M203= -10.60 M(s)=0 O2(g)= 0 1.) what is the standard change in Gibbs energy for rxn as written in forward direction? (...
*March 15, 2012*

**chemistry**

My answer is: deltaS(sys)=654900J/mol*K deltaS(surr)=466.4 J/mol*K deltaS(univ)=655366J/mol*K Sorry I forgot to convert to J also I checked this problem and I only got thedeltaS(surr)=466.4 J/mol*K correct. Please help
*March 14, 2012*

**chemistry**

DrBob222 could you please answer!!!!!!
*March 14, 2012*

**chemistry**

Also I don't know how you are working this problem out.
*March 14, 2012*

**chemistry**

So what are the answers for deltaS(sys)=? J/mol*K deltaS(surr)=? J/mol*K deltaS(univ)=? J/mol*K I need to verify the correct answers. Could you please tell me...Thanks!
*March 14, 2012*

**chemistry **

Consider the following reaction at 298 K: C(graphite) +2Cl2 (g) -----> CCl4(l) Calculate the following quantities. Delta H: -139 kJ/mol deltaS(sys)=? J/mol*K deltaS(surr)=? J/mol*K deltaS(univ)=? J/mol*K My answer is: deltaS(sys)=654.9J/mol*K deltaS(surr)=0.4664 J/mol*K ...
*March 14, 2012*

**Physics**

A 2.95 kg block on a horizontal floor is attached to a horizontal spring that is initially compressed 0.0330 m. The spring has force constant 900 N/m. The coefficient of kinetic friction between the floor and the block is 0.42 . The block and spring are released from rest and ...
*March 13, 2012*

**Physics**

A baseball is thrown from the roof of a 22.3 m tall building with an initial velocity of 13.1 m/s and is directed 50.9 degrees above the horizontal. A)What is the speed of the ball just before it strikes the ground? B)What is the answer for part A) if the initial velocity was ...
*March 13, 2012*

**math**

Express this ratio as a unit rate $2.40 per dozen
*March 7, 2012*

**math**

1 -1/6
*February 29, 2012*

**math**

A contactor is making preparations to re-tile the border around a swimming pool. The pool measures 60 feet by 30 feet. The border extends 1 foot from each side of the edge of the pool. The contractor is going to use that are 0.25 feet squared. A case of tiles contains 50 tiles...
*February 29, 2012*

**math**

How many people would it take to produce a human pyramid 12m tall? Give various methods
*February 29, 2012*

**new american gov't 2**

Over time, _____ has gained power at the expense of
*February 10, 2012*

**Geometry**

the angle of depression from D to F measures 40 degrees. If EF= 14 yd, find DE. round answer to nearest 10th
*February 8, 2012*

**math**

John wants to put a lace edge around a square piece of cloth. If the cloth is 4 inches wide on one side, how long of a piece of lace should Melina cut?
*February 5, 2012*

**Chemistry**

Use your value for the heat of neutralization, ∆H, -9490, to determine the amount of heat evolved when 10.00mL of 0.4091 M HCL reacts with 10.00mL of 0.4037 M NaOH.
*January 9, 2012*

**Chemistry**

yes, Al3+ sorry. so the moles=.01380. Could you help with the equation?
*January 9, 2012*

**Chemistry**

0.3724 g x 26.98MW = 10.05 mol -538.4kJ x 10.05 mol = -5410 kJ/mol 5410 kJ/mol of heat is evolved?????
*January 9, 2012*

**Chemistry**

The standard enthalpy of formation of Al3-(aq) is -538.4kJ/mol. How much heat is evolved when 0.3724 g of Al(s) reacts with excess hydrochloric acid?
*January 9, 2012*

**physical science**

Brad rides his bike 20 km. He covers the distance in 45 minutes (0.75 hours). What is his speed in kilometers per hour? A.44 km/hr B.15 km/hr C.9.0 km/hr D.27 km/hr
*December 18, 2011*

**Calculus**

find the second derivative of f(x)=3/(x^2+12)
*December 15, 2011*

**pre-algebra**

when rounding to the nearest cent does it have to be to right or left or does it matter?
*December 12, 2011*

**math**

Ryan takes 12 minutes to rake up and bag a pile of leaves. His sister Kareesa takes twice as long. How many minutes would it take both of them working together to complete 10 bags of leaves
*December 12, 2011*

**math**

What does a boy who likes to play with switches do?
*November 30, 2011*

**math**

12 tablespoons cause 16/4=4 so, 4x3=12!
*November 30, 2011*

**math **

sqrt(75)=sqrt(25)sqrt(3) which simplifies to 5 times sqrt(3) so 6x5xsqrt(3)= 30 sqrt(3)
*November 28, 2011*

**Calculus**

Given f"(x)=-25sin(5x)and f'(0)=0 and f(0)=4. Find f(pi/2)
*November 28, 2011*

**math**

30/40=.75 .75x100= 75 percent
*November 28, 2011*

**Physics**

A solid cylindrical disk has a radius of 0.18 m. It is mounted to an axle that is perpendicular to the circular end of the disk at its center. When a 40-N force is applied tangentially to the disk, perpendicular to the radius, the disk acquires an angular acceleration of 90 ...
*November 22, 2011*

**Geometry**

draw a picture, hint its more then 10 but less then 16
*November 16, 2011*

**Physics**

planet orbits a star once every 2.84 10^7 s in a nearly circular orbit of radius 1.42 10^11 m. (a) With respect to the star, determine the angular speed of the planet. (b) With respect to the star, determine the tangential speed of the planet. (c) With respect to the star, ...
*November 16, 2011*

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