Thursday
October 23, 2014

Posts by Alex


Total # Posts: 2,643

Inverse/Direct Variation
Is this an example of inverse variation, direct variation, or neither? Because, on average, Linda makes 60% of the free throws she shoots in a basketball game, the number of points she scores on free throws depends on the number of shots she gets.
September 1, 2013

Chemistry
the mass of cylinder one is 1.35 times the mass of cylinder two, and the volume of cylinder one is 0.792 times the volume of cylinder two. If the density of cylinder one is 2.70 g/cm3 what is the density of cylinder two? THIS QUESTION HAS ME GOING CRAZY!!
September 1, 2013

physics
A speeder traveling at a constant speed of 125km/h races past a billboard. A patrol car pursues from rest with constant acceleration of (8.0km/h)/s until it reaches its maximum speed of 190km/h, which it maintains until it catches up with the speeder. (a) How long does it take...
August 27, 2013

Math
How many thousands of square kilometers of area does Canada have?
August 27, 2013

biology- photosynthesis
also should i include this: During the summer when plant life thrives the concentration drops, this is because the plants are "breathing" in the CO2, each fall as the vegetation dies off and decomposes some, (not all) of the sequestered CO2 is released back into the ...
August 6, 2013

biology- photosynthesis
There is a distinct oscillation of CO2 during each year as CO2 is added to the atmosphere each winter or removed from the atmosphere each summer. Explain what specific cellular processes lead to these changes in CO2 level. You must explain what causes CO2 to be released to the...
August 6, 2013

chemistry
A scientist makes 300.0 mL of an acetate buffer using [CH3COOH]o=[NaCH3COO]o= 0.075 M. How many mL of 5.0 M NaOH can be added before its buffering capacity is exhausted?
August 5, 2013

biology multiple choice
I am preparing my self for a biology exam and i am going through past papers. Unfortunately they do not supply us with the answers, which in one way is good.(since you have to actually work for your answers) All I am asking of you people is that you run over my answers and see...
August 1, 2013

World History
Thanks!
July 31, 2013

World History
Under what circumstances does it appear that paleolithic humans first used boats?
July 31, 2013

Stats
84.13 - power
July 29, 2013

Finance
I can't seem to figure this problem out: You make $4,800 annual deposits into a retirement account that pays 10.5 percent interest compounded monthly. Required: How large will your account balance be in 30 years? I feel like I'm really close, though. Here is where I&#...
July 29, 2013

Physics
Carol drops a stone into a mineshaft 122.5m deep. Calculate the time from when she hears it hit the bottom of the shaft. Assume the speed of sound in the air 343 m/s.
July 8, 2013

english
Choose the answer that displays the correct spelling of the plural form of the words in parentheses. Ancient (Roman) used (goose) as (guard) to warn of (enemy) approaching the camp.
July 5, 2013

Physics
An aircraft starts from rest and accelerates at 42.5m/s^2 until it takes off at the end of the runway. How long will it take the aircraft to travel down the 2.6km runway? Answer is 11 seconds
July 3, 2013

Physics
How far will a car travel if it starts from rest and experiences an acceleration of magnitude 3.75m/2^2 forward for 5.65 s? Answer is 59.9m
July 3, 2013

Physics
How far will a car travel if it starts from rest and experiences an acceleration of magnitude 3.75m/2^2 forward for 5.65 s? Answer is 59.9m
July 3, 2013

Physics
How far will a humanoid robot travel in 3.0 s, accelerating at 1.0cm/s^2(forward) if its initial velocity is 5.0cm/s(forward) answer is 20cm (forward)
July 3, 2013

math
Each game wheel is divided into equal sections. The spinners on the game wheels are each spun once and the number each spinner lands on is recorded. What is the probability that both numbers are odd numbers?
July 3, 2013

Math
John has a box that contains one red ball and one blue ball. Every minute he reaches into the box and randomly takes out a ball from it (without looking). No matter which ball he took out, he puts it back together with another ball of the same color. Thus, after n minutes, the...
July 1, 2013

Physics
A q = +3.00 mC test charge is placed inside a constant uniform electric field created in a parallel plate capacitor connected to a battery of unknown voltage.   The capacitor is made of two parallel plates each with area equal to 0.250 m2 separated by a distance of 0....
June 20, 2013

Physics
A capacitor is constructed from two conducting with a plate separation of d. The voltage between the plates is 31.2 volts and the electric field between the two plates is measured to be E = 2805 V/m. What is the minimum amount of force needed to push an electron from the ...
June 20, 2013

Physics
A charge q=+5.11 mC (millicoulombs) has a mass of 0.00456 kg and is accelerated by two rings connected to a voltage source of 1378 volts. What is the velocity of the charge when it passes through the second ring?
June 20, 2013

statistics
the mean of sat scores of a specific month is1000 with a standard deviation of 100. find the 90 percentiles . assume that the sat score is normal distributed
June 18, 2013

math
When the Senior class decided to order T-shirts, they were quoted a price of $7.50 per shirt plus a setup fee. The total cost for 300 shirts was $2,450. Write an equation in the form y = mx + b that represents the cost, y, for x shirts.
June 18, 2013

math
Eden finances a purchase of $611.03 by making monthly payments of $26.17 for 2 1/2 years. What annual interest rate, compounded monthly, is she being charged?
June 10, 2013

Math
how do i put 1/2, 2/3, 1/4, and 1/3 in order from least to greatest
June 2, 2013

coefficients
Name the coefficients in the polynomial 4x^2+3x-3
May 26, 2013

Polymonimals!
(m^2-m-4)+(m-5) m^2-2m+9 m^2+2m-9 m^2-2m-9* my answer m^2-9
May 26, 2013

grammar
In the following sentence identify the function of the infinitive (phrase). Is it too expensive to travel to Europe?
May 21, 2013

biology urgent
Glucose is transported into a cell through a process of co-transport, where it is moved against its concentration gradient through a membrane channel. Moving any molecule against its concentration gradient requires energy, but these glucose channels do not require ATP or any ...
May 21, 2013

science
how i s fishing line measured
May 20, 2013

english
16. Which one of the following sentences includes an error in subject-verb agreement? A. Either June or her children are going to the movie tonight. B. Laverne, who's married, and Shirley, who's single, both walk their dogs. C. Neither Hannibal nor her pups is in the ...
May 15, 2013

english
15. Which one of the following is a run-on sentence? A. Jerry told me he likes June, but Hank likes Julie better. B. I would talk to Frank if I knew him, but people don't ever talk to him. C. I'm not a fan of wrestling, but Leslie is. D. I think Frank might be too ...
May 15, 2013

english
Either Mark or his students _______ on the ferry boat. 13. If you want to use the present tense, which word would best fill the blank? A. were B. are C. was D. is B is the only present tense?
May 15, 2013

english
As it sailed south, Lord Nelson's great ship, Victory, met the Spanish fleet near Trafalgar. 12. The simple subject of the sentence is A. Lord Nelson. B. ship. C. fleet. D. south. I think best answer is B?
May 15, 2013

College algebra
Use the rational zeros theorem to find all the real zeros of the polynomial function. Use the zeros to factor f over the real numbers f(x)=9x^4+28x^3+66x^2+196x+21 Find the real zeros of f Use the real zeros to factor f f(x)=
May 14, 2013

Polynomial help
My answer is 5^10 * 5 5^6 * 5^5 5^7 * 5^4 The rules of multiplying exponential numbers with the same base is that you add the powers up.
May 14, 2013

Polynomial help
list 3 different ways to write 5^11 as the product of two powers.Explain why all of your expressions are equal to 5^11.
May 14, 2013

College Algebra
For the given functions f and g, find the following and state the domain of each result. f(x)=√x;g(x)=7x-2 (a)(f*g)(x)= What is the domain of f*g? (b) (f/g)(x)= What is the domain of f/g?
May 13, 2013

polynominals
(6h+1)-(9h+4) don't tell me the answer just give me the formula
May 13, 2013

5th grade math (dividing fractions)
Thanks!
May 13, 2013

5th grade math (dividing fractions)
Can you check this problem? How many twelfths are in one sixth? work: 1/6 divided by 1/12 = 1/6 * 12/1 = 2 ans= 2
May 13, 2013

TRIG
in an arithmetic sequence a1=4 and d=8 which term is 428 Show your work
May 11, 2013

TRIG
what is the explicit formula for the sequence 3,7,11,15
May 11, 2013

TRIG
determine the sum of the first 100 even integers SHOW YOUR WORK
May 11, 2013

TRIG
the population of a certain city is 1.3 million people. if the population is growing at the rate of 4% per year what will the population be in 8 years
May 11, 2013

TRIG
What is the 6th term of the geometric series with a1= -5 and r=2.5
May 11, 2013

chemistry
a)Calculate the pH of a solution of 0.75 M HNO3, which is a strong acid. b)Calculate the pH of a 1.0 L aqueous solution made from 0.80 mol CH3COOH and 0.20 mol KCH3COO (Ka = 1.8 x 10^-5).
May 9, 2013

chemistry
How many moles of sodium nitrate are in 0.65L of a 0.2 M NaNO solution?
May 7, 2013

5th grade Language Arts
Thanks for checking!
May 6, 2013

5th grade Language Arts
I was given an assignment to add suffixes ( -ible, -ive, and -ion) to certain root words. I can't seem to find any words for post using the above suffixes. I've tried searching dictionary and roots with post. Are there any words that can be made without changing the ...
May 6, 2013

5th grade math (word problems)
Thanks! I see what I did wrong for #2.
May 6, 2013

5th grade math (word problems)
Can you explain how to do the following problems? 1. Order these fractions from Greatest to least. 3/12, 5/8, 1/4, 7/8, 4/16 work: find least common denominator 3/12 = 12/48, 5/8 = 30/48, 1/4 = 12/48, 7/8 = 42/48 answer = 7/8, 5/8, since 3/12 and 1/4 are the same, which would ...
May 6, 2013

chemistry
What is the difference between the two strong acids, nitric and hydrochloric acid, when they behave as the oxidised forms in a reduction half-equation?
May 6, 2013

Maths
168 children went to a them park. If 1/3 of the girls is equal to 4/9 of the boys, how many boys went to the theme park?
May 6, 2013

Slavery
how much were slaves paid after the civil war
May 5, 2013

Chemistry
Determine the solubility of a sodium sulfate, Na2SO4, in grams per 100g of water, if 0.94 g of Na2SO4 is dissolved in 20 g of water to make a saturated solution.
May 3, 2013

Math
The length of a rectangle is 11 cm less than 3 times its width. If the area of the rectangle is 20 square inches, find the length and width
May 2, 2013

chemistry
Reverse the reactions. Label the acids and bases on the left-hand side of each of the reversed equations? 1. HCl + NH3 => NH4+ + Cl- 2.NH3 + H2O => NH4+ +OH- 3. HCl +H2O => H3O+ +Cl- 4. H3PO4 +H20 => HPO4^-2 +H3O+ 5.H2PO4- +H2O => HPO4^-2 +H3O+
May 2, 2013

Grammer Please Help!!
Viewed through a telescope, the planet Mars looks rust-red. Because rust is a large component of its soil.
May 2, 2013

chemistry
1.Does a pH of 8.6 describe a solution with a higher or lower hydronium ion concentration compared to a neutral solution? Is such as solution called acidic or basic? 2. Compared to a neutral solution, would you expect an acidic solution to have a higher or lower pH and a ...
May 2, 2013

5th grade math (word problems)
Thanks!!
May 2, 2013

5th grade math (word problems)
I'm not sure how to solve this: A group of friends went to an amusement park. 10 of them rode the ferris wheel, 15 rode carousel, and 11 rode the roller coaster. 7 of them rode both the ferris wheel & roller coaster. 4 rode both the ferris wheel & carousel. 5 rode both the...
May 2, 2013

Speech
thank you I appreciate your help:)
May 1, 2013

Speech
Analysing errors consumes time and money. In order to assure that the physical erosion processes are correctly identified both error analysis and standardisation of measuring techniques are necessary to limit uncertainty and to minimise misinterpretation For the last paragraph...
May 1, 2013

Speech
thank you very much i will repost once i have finished the whole thing.
May 1, 2013

Speech
Soil erosion research is difficult for several reasons notably because it is an intermittent process and thus, an extremely difficult phenomena to observe. In most studies, only the consequences are investigated. Environmental data measurement, processing and analysis are ...
May 1, 2013

Speech
Please rephrase the following sentences into a more simple manner. I need to give a presentation and i would like to write this out simpler. Thank you guys Research of soil erosion is difficult for several reasons, but particularly because soil erosion is an intermittent ...
May 1, 2013

math
what is 9/2 - 1/2
April 30, 2013

math
what is 9/2 - 1/2
April 30, 2013

chemistry
a)Name two cations whose salts are quite soluble in water? b)Name one anion whose salts are soluble in water.?
April 29, 2013

5th grade math (word problems)
Maria is packaging boxes into a carton that is 4 in. x 6 in. x 3 in. THe boxes are 2 in. x 1 in. x 1 in. How many boxes will fit in the carton? I'm not sure how to solve. I know volume = l x w x h. The carton has volume of 72 cubic inches (4 x 6 x 3). THe boxes are 2 cubic...
April 28, 2013

5th grade math (word problems)
thanks!
April 23, 2013

5th grade math (word problems)
Problem: A receipe for 4 dozen cookies requires 1 1/2 cups of flour. How much flour is needed for 1 dozen? work: 4 divided by 1 1/2 = 4/1 x 3/2 = 4/1 x 2/3 = 8/3 cups of flour Can you explain why i don't need to change 4 dozen to 48 and then divide by 1 1/2?
April 23, 2013

Physics
Thank you so much!
April 23, 2013

Physics
21. The Mariana trench is located in the Pacific Ocean at a depth of about 10300 m below the surface of the water. The density of seawater is 1025 kg/m3. If an underwater vehicle were to explore such a depth, what force would the water exert on the vehicle's observation ...
April 23, 2013

Math
I don't know
April 22, 2013

chemistry
For each of the following primary standard acids, write the titration equation and calculate the volume of 0.100 M NaOH required for the titration: (i) 300 mg benzoic acid (C6H5COOH) (ii) 200 mg oxalic acid dihydrate (C2O4H2.2H2O) Equations: (i): C6H5COOH +NaOH->NaC6H5COO +...
April 22, 2013

chemistry
Calculate the weight (in mg) of borax Na2B4O7.10H20 required to react with 25.0 mL if 0.100 M HCI No. moles HCl consumed = __________ moles No. moles borax required = __________ moles Molar mass of borax = __________ g mol-1 (Na2B4O7.10H2O) Weight borax required = __________ g...
April 22, 2013

chemistry
15.0 mL of 8.00 M NaOH was diluted with water to 500 mL. Calculate the molarity of the diluted NaOH solution. My calculations: 0.015L x 8.00moles/1L x 39.997/1mole = 4.8g M= (4.8g x 1mole/39.997) / 0.500L = 0.24M is my workings correct? Is there another way to get to this?
April 22, 2013

chemistry
STANDARDISATION OF 0.1 M HCl Borax dissolves slowly in water at room temperature. Why do we not use a stirring rod to mix the solution and speed up this stage of the experiment?
April 22, 2013

5th grade math (word problems)
thanks!
April 21, 2013

5th grade math (word problems)
Mrs. Jones bakes pies. She always cuts each pie into 8 slices. Ther are 13 slices left on the counter. How many pies are on the counter? (write as mixed number). work: 13/8 = 1 5/8 pies. Is this correct?
April 21, 2013

chemistry
what is the h+ of a solution with a ph of 10 at 25 degree celsius
April 21, 2013

chemistry
in relation to the pH of pure water at 25 degree Celsius where do the pH values of acid fall
April 21, 2013

chemistry
A 0.0583 mol sample of formaldehyde vapour, CH2O, was placed in a heated 0.359 L vessel and some of it decomposed. The reaction is CH2O(g)---> H2(g) + CO(g). At equilibrium, the CH2O concentration was 0.0449 M. What is the value of Kc for this reaction? my answer was 0....
April 20, 2013

chemistry
At high temperature, 2.00 mol of CH2O was placed in a 4.00 L container where it decomposed via the equilibrium CH2O(g)<=>CO(g)+H2(g) . At equilibrium, the concentration of CO was measured to be 0.0317 M. What is Kc for this reaction at this temperature?
April 20, 2013

Physics
6. When a mass is attached to a spring, the period of oscillation is approximately 2.0 seconds. When the mass attached to the spring is doubled, the period of oscillation is most nearly a) 0.5 s b) 1.0 s c) 1.4 s d) 2.0 s e) 2.8 s
April 19, 2013

chemistry
lem;tdgpH:T
April 17, 2013

Gifted Chemistry
Calculate the freezing point and boiling point of a solution that contains 56.8 g NaCl and 32.0 g KBr dissolved in 750.3 mL H2O.
April 16, 2013

Grade 12 Calculus
Determine the velocity and acceleration as functions of time, t, for s(t) = 45t − 5t^2, where s(t) represents the distance as a function of time. (Hint: velocity and acceleration correspond to the first and second derivatives of the distance)
April 15, 2013

Chemistry
Write the name and chemical formula of an amphoteric ion.
April 15, 2013

chemistry
Name three sodium salts that produce weak bases in aqueous solution.
April 15, 2013

Physics
A small steel sphere of mass 0.40 kg is attached by a 0.50 m long cord to a swivel pin set into the surface of a frictionless table top. The sphere moves in a circle on the horizontal surface with a speed of 6.0 m/s. a.) what is the magnitude of the centripetal acceleration of...
April 12, 2013

Pre Calculus
Thanks!
April 11, 2013

Pre Calculus
Having trouble verifying this identity... cscxtanx + secx= 2cosx This is what I've been trying (1/sinx)(sinx/cosx) + secx = 2cosx (1/cosx)+(1/cosx) = 2 cosx 2 secx = 2cosx that's what i ended up with, but i know it's now right. did i mess up with the algebra?
April 11, 2013

Physics Electric Force
Particle A of charge 2.76 10-4 C is at the origin, particle B of charge -6.54 10-4 C is at (4.00 m, 0), and particle C of charge 1.02 10-4 C is at (0, 3.00 m). We wish to find the net electric force on C. (a) What is the x component of the electric force exerted by A on C? (b...
April 11, 2013

Physics
Particle A of charge 2.76 10-4 C is at the origin, particle B of charge -6.54 10-4 C is at (4.00 m, 0), and particle C of charge 1.02 10-4 C is at (0, 3.00 m). We wish to find the net electric force on C.
April 11, 2013

Math
In a recent year there were the following numbers (in thousands) of licensed drivers in the United States. MALE: Age 19 and under - 4746 Age 20 - 1625 Age 21 - 1679 FEMALE: Age 19 and under - 4517 Age 20 - 1553 Age 21 - 1627 Choose one driver at random. Find the probability ...
April 10, 2013

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