Tuesday

April 28, 2015

April 28, 2015

Total # Posts: 4,337

**CHemistry**

Given the following information calculate the heat of formation of C2H4. C2H4 + 3 O2 ¡æ 2 CO2 + 2 H2O ¥ÄH¡Æ = -414 kJ/mol C + O2 ¡æ CO2 ¥ÄH¡Æ = -393.5 kJ/mol H2 + ¨ö O2 ¡æ H2O ¥ÄH&...
*April 26, 2015*

**Science**

What are the four flight forces? Give a brief description of each.
*April 21, 2015*

**calc**

integral from 1 to x of (5/(t^3 +3))dt
*April 19, 2015*

**Science**

The current atomic model would be revised if a) better microscopes were being used to study its structure. b) better microscopes are invented in the future. c) new information about an atom's structure is discovered. d) a new element is discovered in the future.
*April 16, 2015*

**AP Chem**

Lead metal is added to a solution of hydrochloric acid. What would be the theoretical cell potential, E°, for the reaction?
*April 13, 2015*

**Applied Chemistry - HELP!**

Make a poster of types of product warning labels. I'm having a hard time looking up types of product warning labels. Please help and please do not just give me Google link to product label for me to look up by myself which I did but I .... having a hard time.
*April 7, 2015*

**History**

canada and around the time of the constitustion act i suppose to start
*April 3, 2015*

**History**

What were three tactics of assimilation used on aboriginals?
*April 3, 2015*

**Accounting**

Paid $1,200 cash to Hilldale Mall for Success Systems' share of mall advertising cost. I need to know the debit and credit.
*April 2, 2015*

**Accounting**

Completed a project for Chang Corporation abd received $3620 cash. I need to know the debit and credit. Thanks
*April 2, 2015*

**Algebra**

For f(x)=(3x^2)+5and g(x)=7x-2, a. Verify: g(x + 2) ≠ g(x) + g(2). b. Find (f – g)(x). c. Using the resulting function in (b), show that (f – g)(2) = f(2) – g(2). (The work should be different for each side of the equation.) d. Is (fg)(0) =(f/g)(0)? ...
*April 2, 2015*

**chemistry**

Calculate the molarity of a solution made by adding 47.2g of NaNO3 to a flask and dissolving it with water to create a total volume of 1.80L .
*April 1, 2015*

**physics**

A 2inch diameter pipe has been chosen to pass 65 GPM. Can this diameter be used for the suction line? If not , what line diameter should be specified?
*March 31, 2015*

**physics**

. An open tank holding 400 cubic foot of air at atmospheric pressure at 70 degrees F and heated to 160 degree F. What is the volume of air that escapes from the tank?
*March 31, 2015*

**physics**

A 25HP electric motor turning a 1800 RPM will produce how many foot pounds of torque?
*March 31, 2015*

**math**

The ratio of Maya’s beads to Kayla’s beads was 12:7. After Maya bought another 28 beads and Kayla gave away 3/2 beads, 5/7 of Kayla’s beads were left. a) How many more beads did Maya have than Kayla in the beginning? b) Find the new ratio of Maya’s beads to...
*March 30, 2015*

**math**

The ratio of Maya’s beads to Kayla’s beads was 12:7. After Maya bought another 28 beads and Kayla gave away 32 beads, 57of Kayla’s beads were left. a) How many more beads did Maya have than Kayla in the beginning? b) Find the new ratio of Maya’s beads to ...
*March 29, 2015*

**calc**

Verify that the function satisfies the three hypotheses of Rolle's Theorem on the given interval. Then find all numbers c that satisfy the conclusion of Rolle's Theorem. (Enter your answers as a comma-separated list.) f(x) = x^3 − x^2 − 12x + 8, [0, 4]
*March 26, 2015*

**Math**

Choose all measurements that are equivalent to 45 meters. a 450 centimeters b 4500 centimeters c 0.045 kilometer d 0.45 kilometer e 4500 millimeters I pick b, d, e is this correct.
*March 26, 2015*

**Math **

What ratio is equivalent to 3/20? a 5 to 100 b 100 to 5 c 140 to 21 d 21 to 140 I picked d is this correct?
*March 26, 2015*

**math is my answer correct**

Is my answer correct?? The function h(t) = 2 + 50t - 1.862t^2, where h(t) is the height in metres and t is the time in seconds, models the height of a golf ball above the planet Mercury's surface during its flight. A) What is the maximum height reached by the ball? I got ...
*March 25, 2015*

**math**

Thank you. I moved the decimal too many places. Thanks again
*March 25, 2015*

**math**

A $300 mountain bike is discounted by 30% and then discounted an additional 10% for shoppers who arrive before 5am. If you go to the store at 4:30 am, how much will you pay? I did 300^30 =90. 300 -90 ==210 ^ 10 =2.10. 210-2.10= 207.90. Is this correct?
*March 25, 2015*

**math**

I get 2,250. Thank you Ms. Sue for making it easy to understand.
*March 24, 2015*

**math**

ted takes out a student loan to pay for his college tuition this year. Find the interest on the loan if he borrowed $2,500 at an annual interest rate of 6% for 15 years. Could someone help step by step, I cant seem to get it. Thank you
*March 24, 2015*

**math**

Ted takes out a student loan to pay for his college tuition this year. Find the interest on the loan if he borrowed $2,500 at an annual interest rate of 6% for 15 years. What is the formula to figure this out ?
*March 23, 2015*

**linear algebra**

Solve using the concept of rank. Is S={−16 −7 −21,2 1 3, 21 9 2} a linearly independent set of vectors in R3? So I know how to find out if this set is linearly indep. But, I don't know how to use row rank to find this out..
*March 23, 2015*

**math**

thank you
*March 23, 2015*

**math**

Tim sells sneakers. He receives $9.75 an hour and 3% commission on sales. One week he works 24 hours and his sales total $1,879.95. What are his total earnings for the week ? Please help
*March 23, 2015*

**science**

is it corrrectr
*March 21, 2015*

**science**

i think its a
*March 21, 2015*

**science**

At 3:15 one afternoon, the temperature over the land reaches its highest value for the day — about 89°F. The temperature over the adjacent water is about 72°F. What would the expected weather conditions be at this time? A. Cloudy skies and a sea breeze B. Clear ...
*March 21, 2015*

**Math**

Zain goes swimming. He swims the first length of the pool in 2.5 minutes. The time he takes to swim each length is 10 seconds more than he took to swim the previous length. A. Find the time Zain takes to swim the fifth length. B. Find the time taken for Zain to swim a total of...
*March 19, 2015*

**Math**

A ball is dropped vertically. It reaches a height of 1.6m on the first bounce. The height of each subsequent bounce is 80% of the previous bounce. A. Find the height the ball reaches on the 6th bounce. B. Find the sum of the first seven terms of this sequence.
*March 19, 2015*

**chemistry**

2 NH3 (g) ----> N2 9g) + 3 H2 (g) at equilibrium, [NH3] = 0.0227 M, [N2] = 0.119 M, and [H2] = 0.346 M. Calculate Kc for the reaaction at this temperature
*March 17, 2015*

**computer applications**

John wants to see the formulas he has used in his spreadsheet but he does not want to see the results of the formulas. How does he display his formulas? A. Click on Trace Precedents. B. Click Print Formulas. C. Click on Show Formulas. D. Click Evaluate Formulas from reading my...
*March 16, 2015*

**Physics**

Oops, c should be when cos(kx) = 0, work it out from there.
*March 14, 2015*

**Physics**

a), Just pop 0 into the equation, what are you left with? b) ω is 2pi/T, so pop that into the equation. c) ?? Not sure. I think it's whenever Sin(wt) = 0, so 0, pi, 2pi, 3pi etc. But I think wavelenth is 2pi, so 1/2, 1, 3/2 might be the answer.
*March 14, 2015*

**Maths**

Suppose that the reliability of a HIV test is specified as follows: Of people having HIV, 90% of the test detect the disease but 10% go undetected. Of people free of HIV, 99% of the test are judged HIV–ive but 1% are diagnosed as showing HIV+ive. From a large population ...
*March 14, 2015*

**math**

Robert is replacing sod in two square-shaped areas of his backyard. One side of the first area is 7.5 feet. One side of the other area is 5.7 feet. The sod costs 'y' dollars per square foot. A)Write an expression to show how much Robert will spend on sod. B)If the sod ...
*March 10, 2015*

**math**

In each of the following, relationships among marked angles are given below the figure. Find the measures of the marked angles. b. m(∠AOB ) is 30° less than 2m (∠BOC ) c. m(∠AOB ) – m(∠BOC ) = 50
*March 9, 2015*

**Math**

A flower planter is to be made from landscape ties that are 4 feet long, four inches high and six inches wide. Each planter is 4 ties high. Describe how to build the planters so that they are square
*March 9, 2015*

**statistics**

In the population, the average IQ is μ = 100 with a standard deviation of σ = 15. A team of scientists wants to test a new medication to see if it has a positive effect on intelligence. A sample of n = 10 participants who have taken the medication has a mean of M = ...
*March 7, 2015*

**Physics**

mass is grams, so 0.016 .. pop that in your formula and you're golden
*March 5, 2015*

**earth**

what is 15 times 12
*March 4, 2015*

**math**

Tony plans to install a window pane that has a length of 8 inches and a width of 6 inches. He decides that the length has to be reduced by z inches. He says that the new area of the window pane will be 48−z. Is Tony correct? Why or why not? THANK YOU!!!!!
*March 3, 2015*

**math**

Janice plans to build a rectangular table top with an area of 60+20r square inches. The width of the table top is 10 inches. What is the length of the table top?. THANK YOU
*March 3, 2015*

**Algebra 2**

Simplify each sum or difference. State any restrictions on the variable. -3x/x^2-9+4/2x-6
*March 3, 2015*

**physic**

Question Part Points Submissions Used A hypodermic syringe contains a medicine with the density of water (figure below). The barrel of the syringe has a cross-sectional area of 2.88 10-5 m2. In the absence of a force on the plunger, the pressure everywhere is 1.00 atm. A ...
*March 3, 2015*

**physics**

NEEDS HELP PLEASE!! A 100kg shot putter is putting a shot 4kg. Just before he releases the shot, he is in the air (feet are off the ground). At this instant, the only force he exerts against the shot is an 800N horizontal force directed forward. a-what is his horizontal ...
*March 2, 2015*

**math**

Scale factor of 0.5 inches = 1.5 feet
*March 2, 2015*

**linear**

^ it is an augmented matrix, sorry the formatting is bad.
*March 2, 2015*

**linear**

Is the set S = {v1, v2, . . . , vk} linearly independent? 1 0 2 −2 0 1 0 0 1 0 −1 −1 2 0 0 0 −1 2 1 0
*March 2, 2015*

**Ratio**

The ratio of cats to dogs at the shelter is 3 to 2. If there are 16 cats at the shelter, how many dogs are there?
*March 2, 2015*

**S.S**

B, im 110% sure
*March 2, 2015*

**Statistics**

How does the standard deviation differ to of the sample mean x bar. Please help I'm confused
*March 2, 2015*

**linear algebra**

^ that is an augmented matrix by the way. with <0,0,0,0> being the vector added
*February 28, 2015*

**linear algebra**

1 0 2 −2 0 1 0 0 1 0 −1 −1 2 0 0 0 −1 2 1 0 Is the set S = {v1, v2, . . . , vk} linearly independent?
*February 28, 2015*

**Problem Solving**

If I understand correctly the money he can spread is meant to be the money he can spend? so all you have to do is take 5% of the money he earned. so .05*x = y where x is total money earned and y is money able to spend
*February 28, 2015*

**math**

Write and solve an equation to find the complement of an angle that measures 42 degrees. THX!
*February 27, 2015*

**Theology (religion) HELP!!!! (plz read ASAP!)**

I'll pick i mean NOT I'll BE.
*February 27, 2015*

**HELP!!!! (plz read ASAP!)**

So... I'll be Isis as an example since that reflect an 'unredeemed' (unsaved) world.
*February 27, 2015*

**Theology (religion) HELP!!!! (plz read ASAP!)**

Does this question means.... natural disasters or something...?
*February 27, 2015*

**HELP!!!! (plz read ASAP!)**

I'm still struggling....
*February 27, 2015*

**Theology (religion) HELP!!!! (plz read ASAP!)**

Nae one or two experiences or situations that reflect an 'unredeemed' world. What reasons can you identify for this. 300 words Please help me. I'm NOT asking you to do this essay for me .... I just don't know what to write for this essay.
*February 27, 2015*

**Math**

Two rectangles have an area of 81 square inches.Name two possible perimeters for the rectangles.
*February 26, 2015*

**math**

At 8 A.M., Dylan and his neighbor, Mickey, drove in their cars to a city that was 240 mi. away from their neighborhood. When Dylan reached the city, Mickey had 40 mi. to go. He finally completed the trip 48 minutes later. a) How long did it take Mickey to drive to the city? b...
*February 26, 2015*

**Math**

–37of the people who live in an apartment building are men. 58of the remaining people are women. The rest are children. A total of 220 men and women live in the building. How many people live in the apartment building altogether?
*February 26, 2015*

**math**

A dog weighs 44 pounds and the veterinarian thinks it needs to lose 7 pounds. Mikala wrote the equation x+7=44 to represent the situation. Kirk wrote the equation 44-x=7. Which equation is correct? Can you write another equation that represents the situation? Thank you for ...
*February 26, 2015*

**math**

Write an equation to represent each situation: 1)Juanita has 102 beads to make n necklaces. Each necklace will have 17 beads. 2)Craig is c years old. His 12-year-old sister Kaitlin is 3 years younger than Craig. 3)Kim rented skates for h hours. The rantal fee was $2 per hour ...
*February 25, 2015*

**law**

What are 2 responsibilities of the federal courts?
*February 24, 2015*

**math**

Use the information below to write and simplify an expression to find the total weight of the medals won by the top medal-winning nations in the 2012 London Olympic Games. The three types of medals have different weights. U.S.A. Gold=46 Silver=29 Bronze=29 China Gold=38 Silver...
*February 24, 2015*

**Math**

The ratio of boys to girls in the checkers club at one school is 2:3. the number of club members is more than 20 and fewer than 30. how many club members are there?
*February 22, 2015*

**calculus**

given the velocity of a particle traveling along the y-axis by v(t)=tsin(t^2)
*February 22, 2015*

**math**

thank you Ms. Sue. I get mixed up a lot with these kind of problems. you really break it down to be able to understand. thank you
*February 21, 2015*

**math**

please help on this problem. -2x+4(3x-4)=84. cant get the answer. thank you
*February 21, 2015*

**chemistry**

could one separate the components of a mixture of PbCl2 and Mg(OH)2 using only cold water?
*February 21, 2015*

**AP calculus**

If 54 J of work are needed to stretch a spring from 15 cm to 21 cm and 90 J are needed to stretch it from 21 cm to 27 cm, what is the natural length of the spring?
*February 20, 2015*

**AP calc**

If the work required to stretch a spring 2 ft beyond its natural length is 6 ft-lb, how much work is needed to stretch it 18 in. beyond its natural length?
*February 20, 2015*

**AP calc**

A spring has a natural length of 18 cm. If a 22-N force is required to keep it stretched to a length of 24 cm, how much work W is required to stretch it from 18 cm to 21 cm? (Round your answer to two decimal places.)
*February 20, 2015*

**physics**

A tire placed on a balancing machine in a service station starts from rest and turns through 4.93 revolutions in 1.47 s before reaching its final angular speed. Calculate its angular acceleration. It must be in units of radians. Please help. I have 20 attempts to do this and I...
*February 19, 2015*

**Math 12 **

a) How many different sums of money can be made from a toonie, a $5 bill and a $10 bill. I think this equals 2^3-1 b) How many different sums of money can be made from the money in (a) as well as one more $10 bill? This should equal 11. c) Why does the situation become much ...
*February 19, 2015*

**math**

thank you so much .pemdas -I get it
*February 19, 2015*

**math**

HOW do I solve this equation? 6X -5(-X - 13)=131. WHAT IS THE RULE OF ORDER TO DO THIS? THANK YOU
*February 19, 2015*

**english**

Here is my work. She didn't have an expressive manner,so it was idle to attempt to ascertain the state of her affections.
*February 18, 2015*

**english**

Combine these sentences into one sentence using conjuctions,adverbal connectives to create compound sentence. It was idle to attempt to ascertain the state of her affections. She didn't have an expressive manner. Thank you.
*February 18, 2015*

**english**

Combine these sentences into one sentence using conjuctions,adverbal connectives to create compound sentence. The door opened. The crooked little cotton -eyed piano player stood in the entrance. He was waiting for a sound to tell him where she was. Thank you.
*February 18, 2015*

**math**

thank you
*February 17, 2015*

**math**

how do i do this equation ? -158=-2x+ 2(7x -7) . thank you
*February 17, 2015*

**Science**

An elastic cord of elastic constant k and length L is hung from point A having a massless block at the other end. A smooth ring of mass M falls from point A. What is the maximum elongation of cord?
*February 16, 2015*

**math**

thank you so much
*February 16, 2015*

**math**

Could you show me the work to get to the answer please? thank you
*February 16, 2015*

**math**

m-n divided by 4. use m =5 and n = 8. please help. ty
*February 16, 2015*

**Math**

a rectangular room on a blueprints is 2 inches wide and 5 inches longif the scale of the blueprints to the actual room is 1:72,what is the width of the room?
*February 15, 2015*

**Math**

yesterday, molly lunch cost $9.80 and she left a $1.49 tip, today molly lunch cost $12.60 if she tips at the same rate that she did yesterday how much of a tip should molly leave
*February 15, 2015*

**math analysis**

verify tan x/2=secx /secxcscx+cscx
*February 15, 2015*

**math**

How do I simplify this expression -2x +11 +6x . Thank you for help
*February 15, 2015*

**Math**

The dissipation of heat through a composite material of width w centimetres can be modelled by the function f(w)=10/w-0.77ln(w)–3.2 You are required to find the width of material that will prevent any heat dissipation. State what equation you will need to solve?
*February 14, 2015*

**math**

Tony is on his way home in his car. He has driven 12 miles so far, which is three-fourths of the way home. What is the total length of his drive?
*February 13, 2015*

**math **

A farmer wants to fence a small rectangular yard next to a barn. Fence for side parallel to the barn will cost 75 per foot and the fence for the other two sides will cost 30 per foot. The farmer has a total of 1750 dollars to spend on the project. Find the dimensions for the ...
*February 12, 2015*