Friday

July 31, 2015

July 31, 2015

Total # Posts: 1,012

**Statistics**

The average mark on an entrance exam was 70%, with a standard deviation of 9.6. In order to be accepted you must get 60% or better. If 800 students wrote the exam how many were accepted?
*May 21, 2015*

**periodic functions**

At time 4 minutes your submarine is at its deepest, y= -1000m. At time 9 minutes you are at your shallowest, y= -200. Sketch the graph. Write the equation. Your sub is designed to cruise below y= -300 meters. At time zero was your submarine at its cruising depth? Between what ...
*May 21, 2015*

**math**

Ava made 100 paper cranes, and Brittany made 3/4 of the number of paper cranes Ava made. Ava gave 9/20 of her paper cranes to Brittany. Then, Brittany gave 1/4 of her paper cranes to Ava. How many more paper cranes did Brittany have than Ava in the end?
*May 21, 2015*

**Math!!! Please help!!!**

Find the coefficient of x^7 for (x-3)^11 Use the binomial theorem to expand (2y-3x)^5 Prove that (n over r)= (n over n-r) for all integers where n is greater than or equal to r and r is greater than or equal to zero Prove that (n over n-2) + ( n+1 over n-1)= n^2 for all ...
*May 17, 2015*

**Mathematics **

Find the coefficient of x^7 for (x-3)^11 Use the binomial theorem to expand (2y-3x)^5 Prove that (n over r)= (n over n-r) for all integers where n is greater than or equal to r and r is greater than or equal to zero Prove that (n over n-2) + ( n+1 over n-1)= n^2 for all ...
*May 17, 2015*

**Trig**

Find sin(s+t) and (s-t) if cos(s)= 1/5 and sin(t) = 3/5 and s and t are in quadrant 1. =Sin(s)cos(t) + Cos(s)Sin(t) =Sin(1/5)Cos(3/5) + Cos(-1/5)Sin(3/5) = 0.389418 Sin(s-t) =sin(s)cos(t) - cos(s)sin(t) =sin(-3/5)cos(1/5) - cos(1/5)sin(3/5) =Sin-3/5 cos-3/5 = -0.46602 HELP ...
*May 7, 2015*

**MATH**

NOT INDEPENDENT A box contains four white, three red, and two black marbles. Three marbles are chosen at random. a. What is the probability that all three are the same color? b. What is the probability that all three are different colors?
*April 28, 2015*

**Math**

Solve this system that is represented by the following matrix. [1 -2 -2| -3 0 5 3| 13 0 0 1| 1] Write answer in (x, y, z)
*April 8, 2015*

**chemistry cp**

so it it letter c?
*April 7, 2015*

**chemistry cp**

The term formula mass is a general term that can be applied to both ionic compounds and molecular compounds because (a) ionic compounds exist as individual molecules (b) molecular formulas are always empirical formulas (c) not all formulas represent individual molecules (d) ...
*April 7, 2015*

**business math**

Anny invests $8,500, at 6% interest, compounded quarterly for 12 years?
*March 31, 2015*

**Math**

Juanita invests $3,500, at 8% interest, compounded annually for 4 years?
*March 31, 2015*

**math**

If Will gives Molly $9, he will have the same amount of money as her. If Molly gives Will $9, the ratio of the money she has to the money Will has will be 1 : 2. How much money does Will have in the beginning?
*March 29, 2015*

**Chemistry**

What will happen to the number of moles of SO3 in equilibrium with SO2 and O2 in the following reaction in each of the following cases? 2 SO3(g) equilibrium reaction arrow 2 SO2(g) + O2(g) ΔH° = 197 kJ (a) Oxygen gas is removed. increase decrease stay the same (b) The...
*March 15, 2015*

**Child Development**

5+5=10 10+10=20 20+20=40 1+1=2 !!!!!!!!!!!!!!!!!:) :) :) :) :) :) :) :) :) :) :) :) :) !!!!!!!!!!!!!!!!
*March 11, 2015*

**MATH**

AJOISRHJEIWHTIHWTPIRUHTEUIHTUIHTREIOGHGGFTGGFFGFGFGFGGRFGFOTOTOTOTOTOOTOTOTTOPTOTOTOOTOOOTOTTOOOTTOOOTOTOTTOVCB CVNCGN
*March 11, 2015*

**math**

Kim and Kent are on opposite sides of a canal, pulling a barge with tow ropes. Kim exerts a force of 50N at 20 degrees to the canal and Kent pulls at an angle of 15 degrees with just enough force so that the resultant force vector is directly along the canal. Find the number ...
*February 24, 2015*

**math**

(1,1) and (13,3) (0,4) and (14,0) What are the coordinates for the intersection of the two lines?
*February 24, 2015*

**math**

hakiim invested 15000 he put part of it in a term deposit that paid 4% per annum and the remainder in a treasury bill that paing 5% per annum after one year the total interest was 690 how much did hakiim invest at each rate
*February 24, 2015*

**Physics**

sorry as in P1=666400 Pa not 666400pa*6
*February 19, 2015*

**Physics**

Hi, just need a little help with this physics question please. A cylindrical tank of water is located 68m deep in water. An air lock at the bottome of the tank allows access. The sailor must wait while the air pressure in the lock is increased until it equals the water ...
*February 19, 2015*

**physics**

The water storage tank has a diameter of 0.5m and contains 150L of water. You find a small hole rusted in the base, with a diameter of 10mm. what is the velocity of the water flowing out of the hole? So, i feel like I need to somehow use both Bernoullis equation and continuity...
*February 19, 2015*

**physics**

The equation given is 2SO2(g)+O2(g)->2SO3(g), and if 224L/h of O2 (at standard temp and pressure) is consumed by the reaction, how much power is produced? I can't go further than P=Work/Time and Work=P times change in V I've tried 224x2-224x3/60^2 but that's not...
*February 19, 2015*

**physics**

Three charged marbles are glued to a nonconducting surface and are placed in the diagram as shown. The charges of each marble are q1 = 5.75 µC, q2 = 1.48 µC, and q3 = −2.47 µC. Marble q1 is a distance r1 = 3.00 cm to the left of the marble q2, while ...
*February 13, 2015*

**math/algebra**

Determine three consecutive odd integers such that three times the middle integer is seven more than the sum of the first and third integers.
*February 6, 2015*

**math**

Below are two pairs of points. A line goes through each pair of points. What are the coordinates for the intersection of the two lines? Show your work. Pair 1 (1,1) and (7,7) Pair 2 (0,8) and (8,0)
*February 4, 2015*

**Math**

Thank you!
*February 2, 2015*

**Math**

Mistyped it should say "10 spoke english & french" not "10 spoke english & frnech"
*February 2, 2015*

**Math**

In a class of students, 80 spoke English, 110 spoke spanish, 100 spoke french, 50 spoke english & spanish, 30 spoke english & french, 20 spoke french & spanish, 10 spoke english & frnech, but no spanish. How many spoke spanish & french, but not english? The answer is 0. I was ...
*February 2, 2015*

**statistics**

A professor gave an aptitude test to a class of psychology students and computed the mean, median, and mode for the test scores. Which of the following statements cannot be an accurate description of the scores? -All of the above statements are false. -The majority of the ...
*February 1, 2015*

**Physics**

An object fired at an angle of 31.9° above the horizontal takes 2.55 s to travel the last 15.5 m of its vertical distance and the last 10.5 m of its horizontal distance. With what speed was the object launched? (Note: This problem does not stipulate that the initial and ...
*January 27, 2015*

**Physics**

You are practicing throwing darts in your dorm. You stand 3.21 m from the wall on which the board hangs. The dart leaves your hand with a horizontal velocity at a point 1.94 m above the ground. The dart strikes the board at a point 1.73 m from the ground. a) Calculate the time...
*January 27, 2015*

**Physics**

How much work is it to push a box (mass 120 kg) up an incline (angle 16 degrees with the horizontal) that is 9.6 meters long, if the coefficient of kinetic friction between the box and the incline is 0.5?
*January 27, 2015*

**stats**

A jar contains 7 black balls and 25 red balls. You take 2 out without replacing them. Find a)the probability of drawing 2 red balls in a row, b) the probability of drawing a red ball, then a black ball, c) the probability that the two balls will be of different colors
*December 18, 2014*

**chemistry**

How much energy (in kilojoules) is needed to heat 4.00g of ice from -11.0∘C to 21.5∘C? The heat of fusion of water is 6.01kJ/mol, and the molar heat capacity is 36.6 J/(K⋅mol) for ice and 75.3 J/(K⋅mol) for liquid water.
*December 13, 2014*

**Physics/Calc**

A ball is thrown vertically upward from a cliff with a speed of 20 ft/sec. The ball hits the ground at 140 ft/sec. How high is the cliff? v'+-32
*December 12, 2014*

**Physics/Calc**

A ball is thrown vertically upward from a cliff with a speed of 20 ft/sec. The ball hits the ground at 140 ft/sec. How high is the cliff? v'+-32
*December 12, 2014*

**MATH!**

the cost of a midnight madness movie ticket, is reduced by 2/5 of the original cost, to a cost of 3/5c. which expression is equivalent to the new cost? A)c-3/5c B)1-3/5c C)1-2/5c D)c-2/5c
*December 10, 2014*

**Civics**

Good job
*December 8, 2014*

**Algebra**

A fuel storage tank has one supply pump and two identical outlet pumps. With one outlet pump running, the supply pump can increase the fuel level in the storage tank by 8450 gallons in 30 minutes. With both outlet pumps running, the supply pump can increase the fuel level in ...
*November 25, 2014*

**Chemistry**

How do I balance CuSO4 + NH3 + H2O = (NH4)2SO4 + Cu(NH3)4(OH)2 Thank you!!!
*November 24, 2014*

**physics**

consider the 666 N weight held by two cables shown below. The left hand cable and tension 530 N and makes an angle of theta2 with the ceiling. The right hand cable had tension 390 N and makes an angle of theta1 with the ceiling. What is the angle theta1 which the right hand ...
*November 14, 2014*

**Math**

sin theta = 8/17 and theta is in the second quadrant. Find sin(2theta),cos(2theta),tan(2theta) exactly sin(2theta) cos(2theta) tan(2theta) sin(2theta) would it be 2 x (8/17) cos(2theta) would be 2 x (15/17) tan(2theta) would be 2 x (8/17 divided by 15/17) is this correct? I ...
*November 14, 2014*

**Math**

Hi! Could someone possibly help me solve this?; log2(x+4)=log2(x^2+2). For my answer, I got "All Real Numbers" or x=0 but I'm not sure if that's right. Thanks a bunch!
*November 12, 2014*

**Math**

Hi! Could someone possibly help me solve this?; log2(x+4)=log2(x^2+2). For my answer, I got "All Real Numbers" or x=0 but I'm not sure if that's right. Thanks a bunch! :)
*November 11, 2014*

**BTEC Level 3 Business**

I need to find out what information the finance and marketing departments need and use within a business.
*November 10, 2014*

**chemistry**

Nitrogen dioxide abstracts with water vapor to produce oxygen and ammonia gas. If 12.8 grams of nitrogen dioxide reacts with 5.00 liter of water vapor at 375 degrees celisus and 725 tore, how many grams of ammonia can be produced? Use an ice table.
*November 2, 2014*

**chemistry**

give the specific heat for aluminum is 0.900 J/g*c how much energy is required to raise 25.0 g of aluminum from 20.0 to 75.0
*November 2, 2014*

**Physics**

The colors we see when looking at an object depend on the _________. A) density of the object B) amplitude of the light we see C) frequency of the light we see D) mass of the object we are looking at I think it is A
*November 1, 2014*

**physics**

Due to friction with the Earth's atmosphere, a large static electric charge could build up on our plummeting asteroid fragment. Would you expect our fragment to generate a magnetic field? Explain why or why not.
*October 24, 2014*

**Language Arts**

Why does the author of "Always to Remember" discuss Maya Ying Lin's background? A. To show that she experienced hardships B. To appeal to Chinese-American readers C. To show its influence on her design D. To show her disintrest in architecture
*October 23, 2014*

**physics**

A rifle with a mass of 12 g, traveling with a speed of 425 m/s strikes a large wooden block, which it penetrates to a depth of 15 cm. determine the magnitude of the retarding force that acts on the bullet.
*October 22, 2014*

**math word problems**

PLEASE HELP MS SUE
*October 22, 2014*

**math word problems **

nilsa is working on a 60 minute math test. there are 20 questions on the test. if it takes her 20 minutes to complete 12 of the questions, what is the greatest amount of time on average she can spend on each of the remaining 8 questions.
*October 22, 2014*

**English**

I need to ask one question... Why Canada involved?
*October 21, 2014*

**English**

he federal government says Canada will start shipping its experimental Ebola vaccine to the World Health Organization on Monday. The government says in a release the Public Health Agency of Canada is supplying the vaccine to the UN body in Geneva in its role as the ...
*October 21, 2014*

**English**

It's like a format for answering short answer/essay questions g- general statement e- elaboration r- reference 1 r- reference 2 c- conclusion
*October 20, 2014*

**English**

I hope someone knows how to write a gerrc paragraph.. Anyways I need help for the reference part. Hence the word R, how do i show my point? I can explain the quote but I don't know the point. The general statement is, the author used a variety of humor to point the nature ...
*October 20, 2014*

**Algebra**

Using Cowling’s Rule what is the age of the child if the adults dose is 500mg and the child dose is 187 mg?
*October 17, 2014*

**Chemist - Grade 9 - Urgent.**

Predict the physical properties and relative reactivity of Ba and Sr Cs and Br ( elements from periodic table )
*October 16, 2014*

**Grade 9 chemsitry**

Please help.. it's urgent.
*October 16, 2014*

**Grade 9 chemsitry**

Predict the physical properties and relative reactivity of Ba and Sr Cs and Br ( elements from periodic table )
*October 16, 2014*

**Sociology**

Which of the following statements would be most likely? 1)Social class is defined by wealth & income alone. 2)Social class includes wealth, prestige,& influence. 3)Social prestige is directly related to economic status. 4)Life chances are equally available to all Americans.
*October 16, 2014*

**immingration & crime**

What impact do increase in immigration have on crime? 1)An increase in both crime and street gang membership 2)A decrease in both crime and street gang membership 3)An increase in crime but not in street gang membership 4)A decrease in crime but an increase in street gang ...
*October 16, 2014*

**Minority Contract**

The Disproportionate Minority Contract (DMC)mainly requires ______________. 1)the office of juvenile justice to rely primarily on self report data 2)each state to challenge inaccurate depictions of crime 3)the Department of Justice to reduce the number of incarcerated ...
*October 16, 2014*

**Drug Law**

The author argues that illegal use of____ highlighted the presence of racial discrimination in the criminal justice system. 1)crack & powder cocaine 2)pot & meth 3)crack & pot 4)pot & heroin
*October 16, 2014*

**Sociology**

Which of the following disadvantages built into the criminal justice system is not class based? 1) Jim Crow laws 2)Visibly crowed residential areas 3)An ability to pay bail 4)Racial profiling is the reason for African American pedestrian stops
*October 16, 2014*

**Grade 9 Chemistry**

which is more reactive k or ca? ( from periodic table.) when poured in water?
*October 14, 2014*

**Chemistry **

Predict the physical properties and relative reactivity of Rb, Cs, and Fr (From the periodic table)
*October 14, 2014*

**math**

1/2X+3=9 solve for x. I'm confused
*October 13, 2014*

**STATS**

In a normal distribution, approximately 34% of the scores are between the mean and +1 SD; an additional 34% of the scores are between the mean and –1 SD. So, in a normal distribution about 68% of the population (a little more than 2/3) will have scores are within 1 SD of ...
*October 11, 2014*

**statistics**

which of the following percentiles corresponds to the area beneath the normal curve from a z score of -1.00 to +1.00 a.98% b.34% c.68% d.100%
*October 10, 2014*

**statistics**

Correction On this semesters final exam, john scored 72 on his calculus exam, (class distribution (u=65, \?=3.57)\) ) and 53 on his statistics exam (class distribution :u=49, ?=2.04. Which exam should he get the better grade. z1=72-65/3.57=1.960 Z2=53-49/2.04=1.960
*October 8, 2014*

**statistics**

On this semesters final exam, john scored 72 on his calculus exam, (class distribution (u=65, \?=3.57)\) ) and 53 on his statistics exam (class distribution :u=49, ?=2.04. Which exam should he get the better grade. z1=72-65/3.57=1.960 Z2=53-49/3.57=1.120
*October 8, 2014*

**Statistics**

On this semesters final exam, john scored 72 on his calculus exam, (class distribution (u=65, \σ=3.57)\) ) and 53 on his statistics exam (class distribution :u=49, σ=2.04. Which exam should he get the better grade. z1=72-65/3.57=1.960 Z2=53-49/3.57=1.120
*October 7, 2014*

**Math**

Oh thanks
*October 7, 2014*

**Math**

Also how did it become 8 15/16? Wouldnt it become 8 14/16?
*October 7, 2014*

**Math**

Thanks ! :)
*October 7, 2014*

**Math**

Why did you change it to 44 24/16 If i may ask?
*October 7, 2014*

**Math**

At the back of the book it said it was 36 9/16
*October 7, 2014*

**Math**

A piece of wood is 8 and 7/8 in. long is cut a piece 45 1/2 in. long. If 1/16 is wasted for the cut, how much wood is left.
*October 7, 2014*

**statistics**

On this semester’s final exam, Susie scored 72 on her classics exam (class distribution: μ = 65, σ = 3.57) and 53 on her psychology exam (class distribution: μ = 49, σ = 2.04). For which exam should Susie expect the better grade? a. Classics b. ...
*October 7, 2014*

**Geography**

What do countries with large footprints have in common? Small footprints? I don't really understand .
*October 6, 2014*

**math**

Why is 5 to the negative 4 power= 1/5 to the fourth power?
*October 6, 2014*

**English.**

What is another strong way of saying : Yes, I would recommend this book to a friend.
*October 5, 2014*

**Math 2--questions**

6. 470
*September 27, 2014*

**Math 2--questions**

7. Find the sum. –14 + 7 + (–3) –24 –18 –10 *** –4 8. A scuba diver descends 350 feet and then another 120 feet. Express the diver’s final depth as an integer. –420 ft 420 ft ** –470 ft 470 ft
*September 27, 2014*

**Check my answers? Math help.**

Sorry. I left out an ption D on #4. Would the answer be 11? on four? 5. C or B?
*September 27, 2014*

**Check my answers? Math help.**

2. Write an integer to represent owing your friend $10. –10 *** –2 2 10 3. Write the sum as a product, then simplify the product. (–8) + (–8) + (–8) + (–8) ( 2(–8) + 2(–8) = –30 4(–8) = –32 **** 4(–8) = 32 5(–8...
*September 27, 2014*

**Science**

how did you get that? please explain as well. I'd appreciate it
*September 23, 2014*

**Science**

A piece of aluminum has a mass of 39.15g and a volume of 14.5cm cube. Determine the density of the aluminum. What would the density be of a much larger piece of aluminum? explain. I established the density of the al. is 2.7g/ cm cube. I dont get the second part of the question?
*September 23, 2014*

**Math**

5y^3 ( -x^4) When x is -2 and y is -1
*September 23, 2014*

**Geography / English**

So I would say ; Continents like Africa has lessened lives due to poor medical care and services compared to Canada ? I dont know if it was connected to the importance of the evidence.
*September 18, 2014*

**Geography / English**

So I have to write an essay how do i rate canada when compared to the rest of the world. On the sheet it shows you a set up on how to write it Introductory Sentence/ Thesis -In my opinion, canada is favourable compared to the rest of the world. Supporting Evidence - Canada ...
*September 18, 2014*

**Geography**

How would you rate Canada when compared to the rest of the world? Concepts like Primary School Enrollment, Life Expectancy, Population, GDP, HDI and etc;
*September 18, 2014*

**Appreciation**

I'm glad you do. :)
*September 17, 2014*

**Appreciation **

Hi Ms.Sue. I know this isnt a question but I want to thank you for helping me with questions I couldn't understand.
*September 17, 2014*

**Algebra 1**

find the product (2x+1)(2x-1)
*September 17, 2014*