Posts by Annie
Total # Posts: 897

Chemistry
How much faster does nitrogen monoxide (NO) effuse in comparison to dinitrogen tetraoxide (N2O4) 
Quadratic Functions and Equations
A field hockey tournament is to be held in Yellowknife, NWT. According to regulations, the field is 25 yards by 100 yards. For officials, support groups and team members, a uniform rectangular strip of manicured lawn is to be installed by a local business group. If the area of... 
physics 11
An arrow is shot horizontally towards a target 20 m away. In traveling the first 5 m horizontally, the arrow falls 0.2 m. In traveling the next 5 m horizontally, what will the arrow additionally fall? 
Math
For some k>0 the lines 50x+ky=1240 and ky=8x+544 intersect at right angles at the point (m,n).find m+n. 
Math
For some k>0 the lines 50x+my=1240 and my=8x+544 intersect at right angles at the point (m,n).find m+n. 
Chemistry
Balance the following halfreaction under basic conditions. NO3^? ? NH3 
Chemistry  Coordination Complex
Determine the number of unpaired electrons expected in terms of crystal field theory: a) [Fe(NO_2)_6]^3? b) [Fe(H_2O)_6]^3+ 
social studies
what did the actions of the border ruffians demonstrate about the slavery debate? select all that apply a. that opposing sides would resort to violence b. that abolitionists would triumph by using the press c. that settlers would follow the laws d. that compromises would not ... 
Math
Need this answered today also explain the answers please Julia measured the high temperature in her town for one week. Using the chart below, find the mean absolute deviation for the high temperatures. Round your answer to the nearest tenth. Be sure to show your work for ... 
Math
Evaluate: 4  8(3  12)  5  11 =  Nunca (1) asustarse lo que me dijo la vidente (clairvoyant) antes de que se quedara sin batería mi teléfono celular: "En diez años (2) Estare realidad todos tus deseos. (3) consiguire tus estudios, (4) sere un empleo rápidamente y tu é...

Spanish
Please help me work this out with the future verb tense. Completa el párrafo con el futuro de los verbos de la lista. No es necesario usar todos los verbos. asustarse casarse conseguir escribir estar hacerse olvidar ser tener terminar Nunca (1) ____lo que me dijo la ... 
Chemistry
Initial[A] Initial [B] Initial Rate, M/s .740 M .010 M 3.00e10 .740 M .030 M 8.09e9 .740 M .060 M 6.46e8 .740 M .070 M 1.03e7 What is the order of the reaction with respect to the concentration of B? 
Math
For a population with a standard deviation of s = 12, a zscore of z = +0.50 corresponds to a score that is above the mean by 6 points.? True or False  For this question I got true

Math
A population with ? = 59 and s = 8 is standardized to create a new distribution with ? = 100 and s = 20. After the transformation, an individual receives a new score of X = 90. The original score for this individual was X = 51. True or False 
Math
One method for correcting the bias in the standard error is to “pool” the two sample variances using a procedure that allows the bigger sample to carry more weight in determining the final value of the variance. True or false  I got false

Math
A repeatedmeasures research study comparing two treatments with a set of 10 scores in each treatment will produce a t statistic with df = 19. True or False 
Math
A repeatedmeasures study and an independentmeasures study both produce t statistics with df = 20. The independentmeasures study used more participants. True or False 
Math
The term correlation refers to a statistical technique that is used to ____.? measure and describe the linear relationship between two variables measure the magnitude of a variable measure the significance of a variable measure the fit of a model 
Math
The distance between the Y value in the data and the Y value predicted from the regression equation is known as the residual. What is the value for the sum of the squared residuals?? SSresidual = r2(SSX) SSresidual = (1 – r2)(SSX) SSresidual = r2(SSY) SSresidual = (1 &#... 
Math
A set of n = 15 pairs of X and Y scores has SSX = 10, SSY = 40, and SP = 30. What is the slope for the regression equation for predicting Y from X?? 10/30 10/40 40/10 30/10 
Math
A set of X and Y scores has SSX = 20, SSY = 10, and SP = 40. What is the slope for the regression equation?? 4.0 2.0 0.25 0.50 
Biology
Which of the following best explains the absence of fossil evidence from before the Cambrian at the time of Darwin? a) There were no animals b) The animals were very small c) The animals were soft and not likely to fossilize d) The animals were not in areas suitable for ... 
Chemistry
Identify the longest, shortest, strongest, and weakest bonds? A. H3CCCH B. (H3CH)><(HCH3) C. (HH3C)><(CH3H) D. H3CCH2(CHCH3)CH3  also, would recurring be for powering? Because thats all the words my teacher gave me.
 thank you so much

ELA
Replace the underlined definitions with these words. (icant really underline so i will just put quotations) WORDS: Navigate Altitude Destination Landmark Radar Bearing Propelling Equipped Transmitted Recurring Profited 1)The pilot, who never wore green, would "guide"...  Didnt mean to post it here but please help me on this if you can. :)
 Replace the underlined definitions with these words. (icant really underline so i will just put quotations) WORDS: Navigate Altitude Destination Landmark Radar Bearing Propelling Equipped Transmitted Recurring Profited 1)The pilot, who never wore green, would "guide"...

ELA
Write the words that completes each pair of phrases. WORDS: Propelling Equipped Transmitted Recurring Profited 1) __ dreams, __ fever 2) __ for an expedition, __ for battle 3) __ from the experience, __ from your advice 4) __ the message, __ an electrical current my answers 1... 
world history
In Aztec society, women were (Choose all that are correct). 
world history
Where were the Aztecs told to build their capital? 
world history
What was the penalty for gossip in Aztec society? 
world history
What did young men learn in Aztec public schools? Select all that apply. 
Math
Stage 1: 1 = 1 Stage 2: 1+3 = 4 Stage 3: 1 +3+5 = 9 Stage 4: 1+3+5+7= 16 a. Find the next four stages and their sums. b. What is the sum in Stage 20? c. In what stage will the sum be 567? What is the greatest number added in the sum of this pattern? Explain.  A C B D

Chemistry  Chemical Kinetics
Could you reduce the concentration of a reactant by one half in Experiments 24 and achieve the same purpose as doubling their concentration? Why or why not? (I want to say yes, because the ratios will still be the same. Would that be right?) Data for Experiments 14: Exp 1: 4... 
Chemistry  half life
What is the halflife (in h) for the decomposition of O3 when the concentration of O3 is 2.37???10?6 M? The rate constant for this secondorder reaction is 50.4 L/mol/h. 
Physics
A weight with mass m hanging from a ceiling is pulled so that the string is at angle ? from the vertical and remains stationary. Draw the force diagram for the mass m, label the forces and resolve them into their x and yaxes components. Calculate the force exerted by the hand. 
Math
If two integers a and b have a product of 34. What is the least sum of a and b 
physics
A 13.0 gram sample of an unknown metal at 30.0*C is placed in a Styrofoam cup containing 50.0 grams of water at 90.0*C.The water cools down and the metal warms up until thermal equilibrium is achieved at 87.0*C.Assuming all the heat lost by the water is gained by the metal and...  ph_diddy is correct.I just took the test and got a 100%.Trust me if you want a 100 on the test.

math
What is the area of a quadrilateral ABCD, if AB = 5 cm, BC = 13 cm, CD = 9 cm, DA = 15 cm, AC = 12 cm? 
math
Given: ABCD is a parallelogram AM , BN ? angle bisectors DM = 4 ft, MN = 3 ft Find: The perimeter of ABCD 
math
A rhombus ABCD has AB = 10 and m?A = 60°. Find the lengths of the diagonals of ABCD. 
Rational number
7/11, 8/6, 6/8, 9/4, 27/25 arrange the rational number in ascending order 
Maths
sarika prepared squash from tomato,carrot,apple juices. 1/3 of the squash was tomato juice and 2/3 of the remainder was carrot juice. 315 ml of squash vs carrot juice. what volume of the squash was apple juice? 
Maths
kuldeep had a sum of money. He saved 1/4 of it. He spent 4/9 of the remaining on suitcase. a) What fraction of his money sent on suitcase? b) What fraction of his money was left? 
Maths
A cylinder has volume 12cm^3. What will be the volume of a cone with the same base area and perpendicular height? 
math
Given: ABCD is a rhombus, AB = 6, and m?A=60° Find: The height.  6.96×.33=2.30 8.24×3=24.72 24.72+2.30=27.02 The answer is $27.02

math
It takes a ship 3 hours to cover 72 km with the current and 4 hours against the current. Find the speed of the ship in still water and the speed of the current. 
math
A motorboat covers the distance from one pier to the other pier in 4 hours and the way back in 5 hours. What is the speed of the boat in still water, if it covers 70 km with the current in 3.5 hours? 
math
Two shelves contain 55 books. If half of the books from the second shelf were relocated to the first shelf, then the first shelf would contain 4 times more books than the second one. How many books are there on each shelf? 
math
The sum of two numbers is equal to 63 and their difference is equal to 12. Find the numbers. 
Algebra 2
Amelia is documenting the height of sunflower plants each week. She has determined the function to be f(x) = 3x + 3, where x represents time and f(x) represents the height of the plant. Which of the following options describes the restrictions to the domain (x) and range f(x) ... 
math
A diagonal of a parallelogram forms 25° and 35° angles with the sides of a parallelogram. Find the angles of the parallelogram. 
math
In a class, every student knows French or German (or both). 15 students know French, and 17 students know German What is the smallest possible number of students in that class? 
math
An old lady has 125 cats. Seven of them are old, 9 of them are her favorite, 5 of them are both (old and favorite). How many of them are neither old nor favorite? 
Algebra With Pizzazz
I missed a week of school and I know nothing. Next thing I know we get page 163 and have to do everything on it. I don't know anything it's on System of equations substitutinal method. 
Algebra
The value of a new car decreases by 35% in the first year. If a car costs $9,800 when new, how much less would it be worth at the end of the first year? 
Chemistry
its takes 145 mL of zinc nitrate to react completely with 175 ml of 1.5 M potassium hydroxide. what is the concentration if zinc nitrate? 
Calculus AB
What's the lim(x>infinity) sqrt(x^41)/(x^31)? I've tried solving for it but I got 1/0, which would make it undefined. Is that correct?  Okay, thank you very much.

Calculus AB
So the problem is "For x>0, d(lnx)/dx = 1/x and lne=1. A) find the tangent line approximation for ln 3 B) calculate the %error in approximation in part A. My teacher said the answer for part A is that 1/e, and I'm pretty confused. So far I the given info into point... 
math2
When s is measured in meters and t is measured in seconds, find the velocity at t = 2 of the following a. s = t^2 + 3t b. s = t^3  3t^2 c. s = squareroot t + 2 Help plz 
science(physics)
Why a minibus is more likely to topple over when the roof rack is heavily loaded than when the roof rack is empty? 
Math
The population of a city has been decreasing exponentially since 1990. In 1990, the population was 1,000,000. In 2010, the population was 560,000. If t represents time in years since 1990, which of the following equations best models the decay of the population? 
Calculus AB
Please help me with this WS 1) Find the value of lim as x>(square root of 3) of (x^4 + 5x^2 6)/(x+(square root of 3) 2) Find the distance between the discontinuities of g(x)= ((square root of x4))/(x^2 5x 1) 3)Find the value of x at which the curve y=(x^2  4)/(x^5... 
chemistry
Write a balanced equation for the reaction of liquid bromine with chlorine gas.  how did you not know this, its easy!
 Thank you so much! And I will

Calculus AB
Could someone please help me with these tangent line problems? 1) Find the equation of the line tangent to the given curve at the indicated point: 3y^3 + 2x^2 = 5 at a point in the first quadrant where y=1. 2) Show that there is no point on the graph of x^2  3xy + y^2 = 1 ... 
science
a body of mass 10kg is moved in a vertical circle calculate tangential acceleration 
Chemistry
Write mathematical equations that show how you will calculate the detected activity from the count rate due to background radiation and the sample of KCl and how you will determine the “true” activity of your sample from the detected activity. Use the following ...  Thank you so much :)

Calculus AB
I'm not sure how to go about this problem: Find the equation of the line tangent to the curve x^2 + 2xy + y^3 = 4 at y=1 in the 1st quadrant. 
Calculus AB
There's these two word problems I don't understand. 1. A man 6 ft tall walks at a rate of 5 ft per second toward a streetlight that is 30 feet high. The man's 3foottall child follows at the same speed, but 10 feet behind the man. a) Suppose the man is 90 feet ...  X= 16+3=19 Y= 163=13 X=19 Y=13

Chemistry
To treat a burn on your hand, you decide to place an ice cube on the burned skin. The mass of the ice cube is 18.5 g, and its initial temperature is 13.3 °C. The water resulting from the melted ice reaches the temperature of your skin, 28.4 °C. How much heat is ... 
English Lit
1. What pattern or structure is there to the development the the plot? Describe the way the events are organized. Is the structure significant to the meaning? "Car Crash While Hitchhiking" Denis Johnson  Thank you so much! These were the hardest out of the 53 problems.

Calculus AB
Um I don't really understand these word problems so could someone help me please? 1) An object is thrown upward with an initial velocity of 5 m/s from an initial height of 40 m. Find the velocity of the object when it hits the ground. Assume that the acceleration of ...  Thank you so much. I kind of understand the chain rule and product rule, but it's always hard for me to determine how to do/use them.

Calculus AB
Sorry but I've got a lot of problems that I don't understand. 1) Let f(x)= (3x1)e^x. For which value of x is the slope of the tangent line to f positive? Negative? Zero? 2) Find an equation of the tangent line to the oven curve at the specified point. Sketch the curve...  OH okay thank you so much!

Calculus AB
Could someone please help me with this? Calculate the instantaneous rate of change of f <note: f(x)=(x6)/(x+6)> at x=6.  Thank you so much! I understand now.

Chemistry
Please write down the redox reactions (using the halfreaction method!) a)Cl2 from OCl and Cl in acidic solution b)Br2 from BrO3 and Br in acidic solution You don't have to do both, but could you help me step up the half reactions especially for OCl > Cl2  I think you can use the index in your textbook to look this up. It is important you use what your school is teaching you because information is different depending on where you look.

Algebra
solve for the negative value of x: I know if you solve for a positive value, the answer for x=13; but how to get the negative value. 2x8=18 
math
a recipe for fudge brownies calls for 3 5/8 cups of cocoa per bath. if you are making 2 1/2 batches, how many cups are needed?  Mom: circle (C) Dad: oval (c)

Science
Mom:Circke face Dad: Oval face Son: ? what's the son genotype & phenotype? may someone give me an example and help me under this question, please.  THANKS

math
Of 45 students 30 play badminton and 26 play tennis. Each student play either badminton or tennis,determine how many students play:(a)badminton only (b) tennis only 
Math
How many fl oz would go pinto 6.5 
Calculus AB
Please help I'm stuck on this problem for the past hour. Define f(x)= { Ln lx1l }/x A) show that f(c) is continuous at x=2 B)Where on the interval [2,2] is f discontinuous? Show the work that leads to your conclusion. C) classify the discontinuities in part b) as ...