Posts by Lee
Total # Posts: 942
 acetone
 In the figure below, angle y and angle x form vertical angles. Angle x forms a straight line with the 50° angle and the 40° angle. A straight line is shown and is marked with three angles. The first angle measures 50 degrees. The second angle measures 60 degrees. The ...

Differential calculus
The voltage across the plates of a capacitor at any time t seconds is given by V=Ve t/CR, where V,C and r are constants. Given V = 300 Volts, C =0.12*106 F and R = 4*10 6 ohms Find the initial rate of change of voltage and the rate of change of voltage after 0.5 seconds  apply E=kq/r^2 then you can directly find q

math
A rectangular dog pen that has the greatest possible area within a budget of 50$.A pen needs at least one gate for a dog. Fencing is $1.00 per foot, fence posts are $2.00 each and gates (3 feet wide) are $5.00 each. what is the area of a pen? pls help me !!! 
physics
a softball is thrown at a speed of 40 miles per hour in a course that makes an angle of 60 degrees with the positive x axis. what is the initial speed in the horizontal direction?  1. A 2. C 4. B 5. D
 Many thanks Reiny

Maths Please help
How do i work out the mass of a flywheel. I am given the density as 7500kg/m3, a 500mm diameter and a 10cm thickness. Please help 
science
A car,mass of 1500kg,accelerates at 2m/s from rest. Find 060mph time, use 1 mile=1613m 
chemistry
What is the volume of dry O2 gas at STP, if it had a volume of 5.00 L at 103 kPa and 300 K? 
chemistry
Consider the reaction 2 NO2 (g) ⇌ 2 NO (g) + O2 (g). If the initial partial pressure of NO2 (g) is 3.0 bar, and x is the equilibrium pressure of O2 (g), what is the correct equilibrium relation?  Stoichiometry of a Precipitation Reaction – Lab Report Assistant Exercise 1: Stoichiometry and a Precipitation Reaction Data Table 1. Stoichiometry Values Initial: CaCl2•2H2O (g) Initial: CaCl2•2H2O (moles) Initial: CaCl2 (moles) Initial: Na2CO3 (moles) Initial...

trapezoidal method
dy dt = 1 + (t − y)^2, t ∈ [2, 3], y(2) = 1 use a step size of h = 1 and the Trapezoidal method to calculate by hand a numerical value for Y1 (≈ y(t = 3)). 
Geometry
A red cross helicopter takes off and flies 75km at 20degree south of west. There it's drops off some relief supplies. It then flies 125 km at 10 degree west of north to pick up three medics. A. Make an accurate drawing of the two vectors decribed? B. draw the resultant it ... 
math
18*5 1/16= 
math
5*5 1/16= 
Chemistry
calculate the density of 50.0 g of gold that occupies a volume of 2.59 mL. 
Simultaneous equations
3x14y=O and x4y+1=0 
logic and design
algorithm for waking in the morning, making and eating breakfast, I don't feel this is enough for my teacher can you help me. Idon't know if i have enough code start get up while not awake drink coffee endwhile if temperature < 65 then wear sweater else wear tshirt...  Its 900kg/m^3 for the density of liquid I think.

Physics
a rectangular box of negligible mass measures 5m long,1m wide and 0.5m high. How many kilograms of mass can be loaded into the box before it will sink in a freshwater lake? 
Math
A carton contains 1 8/9 liters of apple juice. Rosalia drinks 1/6 liter of the juice every day. How much apple juice is left in the carton after a week? 
physics
If an atom has an electron in the n = 5 state with ml = 3, what are the possible values of l? 
accounting
which is an operating expense a salaries expense b payroll expense  Hello,Sorry, May I know what if the Ksp of both substances no different much??

Chemistry
The Ksp values of BaSO4 and SrSO4 are 1.1x10^10 and 3.8x10^7 respectively. Calculate the concentrations of Ba2+, Sr2+, and SO4 2 in a solution that is saturated with BaSO4 and SrSO4. 
statistics
A researcher finds that two continuous, random variables of interest, X and Y, have a joint probability density function (pdf) given by: f(x,y)={cxy 0<=x<=1,0<=y<=1,x+y=>1, .........0 otherwise where c is a constant. (i) Find the value of c so that f(x,y) ... 
statistics
You want to set up a games stall at the Winter Wonderland. You have a single pack of 52 cards and decide to play card games with your customers. The game is designed as follows. A customer draws 4 cards at random. For every “Ace” that the customer draws, he/she wins...  You want to set up a games stall at the Winter Wonderland. You have a single pack of 52 cards and decide to play card games with your customers. The game is designed as follows. A customer draws 4 cards at random. For every “Ace” that the customer draws, he/she wins...

chin
The following data shows the annual salaries of 12 randomly selected employees of a company (in £ 1000’s) on the Xaxis and the average number of days they have taken days off work in the last 10 years on the Yaxis. Y X Y X 11.1 29.6 9.6 39.2 8.4 58.6 10.9 46.8 8.7... 
chin
You want to set up a games stall at the Winter Wonderland. You have a single pack of 52 cards and decide to play card games with your customers. The game is designed as follows. A customer draws 4 cards at random. For every “Ace” that the customer draws, he/she wins... 
English
Would down to earth be considered a character trait? 
Algebra
"If possible, completely factor the expression. (If the expression is not factorable, enter NF.) x2 − 6x − 7" 
social studies
why did a land bridge emerge between asia and north america  How do we figure out which one is a base and acid between Na2HPO4 and KH2PO4?

History
What was Thomas Jeffersons stance on the Declaration of Independence? 
algebra
Foursquare provides a service that allows your friend to know your whereabouts by checking in . From march 2010 to march 2011 it experienced amazing growth. The function : F(x)=1/18x^2  1/12^x + 1/2 Evaluate F(3)? Determine when foursquare had 4.25 million users ? 
algebra
suppose that an employee receives 7% increase in salary each year and that sequence a^n models the employees salary after n years. Is this sequence arithmetic, geometric or neither ? and please explain 
Algebra
Darren McFadden of Arkansas placed second overall in the Heisman Tophy voting. Players are given 3 points for every first place vote, 2 points for every secondplace vote, and 1point for every third place vote. McFadden received 490 total votes for a total of 878 points. If he... 
English
What is your stance on BASE jumping 
English
Are the authors stance and opinion similar ? Can you give me an example of each? 
History
What is the importance of Samuel de Champlain colonizing Quebec for France 
History
What is the importance or effect of these 1. France is a latecomer in the scramble for New World real estate. 2. French Catholic missionaries, notably the Jesuits, labored zealously to save the Indians for Christ and from the furtrappers. 3. William Pitt, the elder, becomes ... 
English
Can you help me come up with a really good introduction for my essay of the narrative of the life of Olaudah Equiano, that deals with his opinion of white men on the ship . 
Math
you complete 3 cm of a necklace in1 hour. Each hour after the first hour you triple the length of the necklace. What is the length of the necklace after 3 hours? 
English
How does the perspective of white crewmen toward the captives help support the main idea in "from the Interesting Life of Olaudah Equiano" 
English
What is the relationship between literature and place 
PreCalculus
Hello! Can someone check and see if these answers are correct? Thanks! 1.) If a line with slope of 1/2 is perpendicular to another line, then the slope of the other line is 2. TRUE or FALSE? (I choose True) 2.) If Segment QR  Segment TU and the slope of Segment TU is 3, ...  less than 3 seconds

microeconomics
Using MS Excel or a table in MS Word, complete Table1 (Joseph Farms, Inc., Cost and Revenue Data). Assume that the price is $165. Assume the fixed costs are $125, at an output level of 1. Assume that the data represents a firm in pure competition. Show your calculations. ... 
Physics
A sailboat runs before the wind with a constant speed of 4.0m/s in a direction 34∘ north of west. how far west has the sail boat traveled in 29 minutes 
math
calculate the resistances of (a) 100watt 120volt incandescent lamp, (b) a 750watt 115volt toaster, (c) a 1300 watt 110volt portable iron.  180000

Org Chem
Caffeine has a distribuation coefficient of about 8 between Me Cl2 and water. Given 30ml of water containing 10 grams of caffeine. a. How much caffeine can be extracted with one 30mL portion of MeCl2? b. How much caffeine can be extracted with three 10mL portions of Me Cl2? c...  72200

math
A right cone has a height of 8cm and of volume of 250cm^3. Determine the radius of the base of the cone to the nearest centimeter.  44

math
How much money I saved if I follow this number pattern 5,10,15,?20?30 
troy Academy
which of the following statements is the best supported by the new studies 
troy Academy
based on the results of the studies, what should an elementary school teacher do to ensure that a child with an unusual name develops normal intellectual ability 
troy Academy
the overall effect of the five amendments was to extend the vote to 
troy Academy
a comparison of the average temperatures on any given day at points Z, X, and U on the globe would probably show that the temperature at point X is 
TROY Academy
president kennedy was calling on u.s citizens to 
statistics
It is known that the population mean for the Quantitative section of the GRE is 500, with a standard deviation of 100. In 2006, a sample of 400 students taking the GRE, whose family income was between $70,000 and $80,000, had a quantitative GRE score of 511. Perform a one... 
statistics
The Good Mental Health Insurance Company has determined the number of new clients a psychologist gets per month and their respective probabilities, as shown in the table below: Number of New Clients Probability 0 0.05 1 0.10 2 0.15 3 0.35 4 0.20 5 0.10 6 0.05 The probability ... 
statistics
A standardized third grade reading test, called the We Can Read Test, has a mean of 50 with a standard deviation of 10. A developmental psychologist conducts a study, where he assesses the reading ability of a random sample of 75 third graders using the We Can Read Test, and ... 
statistics
A standardized third grade reading test, called the We Can Read Test, has a mean of 50 with a standard deviation of 10. A developmental psychologist conducts a study, where he assesses the reading ability of a random sample of 75 third graders using the We Can Read Test, and ... 
statistics
The Good Mental Health Insurance Company has determined the number of new clients a psychologist gets per month and their respective probabilities, as shown in the table below: Number of New Clients Probability 0 0.05 1 0.10 2 0.15 3 0.35 4 0.20 5 0.10 6 0.05 The probability ... 
statistics
A standardized third grade reading test, called the We Can Read Test, has a mean of 50 with a standard deviation of 10. A developmental psychologist conducts a study, where he assesses the reading ability of a random sample of 75 third graders using the We Can Read Test, and ...  for algebra unit 5 lesson 10 1. C 2. C 3. A 4. B 5. B 6. A 7. A 8. B 9. C 10. B 11. C 12. B 13. D 14. A 15. C 16. C 17. C 18. C 19. B 20. C 21. D 22. B 23. C

math
if a car has decreased in value by 10% and is now worth 22,000.00 how much was the original price  24.34
 Anonymous: Your answer is INCORRECT. The correct formula is: k=xy k= 8*10 k=80 y=80/x y=80/6 simplify the fraction to y=40/3. I am a homeschool teacher.
 peace I beleive

math
k3/7k=6/7 3.5+6.4x=x3.4 
Statistics
Assume it is known that the probability of birth is equal in all months. What is the probability that in the STAT class of 120 students, exactly 20 students have their birthdays in either August or September? Solve using (i) the exact Binomial distribution, (ii) the Normal ... 
Math
Assume an annual 6% return and annual compounding if Tara saves $2000 a year for 40 years how much money would she have at the end?  24m/s
 Select the sum of the series E^5k=1^k2.

math
Select the first five terms in the arithmetic sequence an = 8n, starting with n = 1 
physics
a 50N force is directed at an angle of 50 degrees above the horizontal. resolve this force into vertical and horizontal components. 
math
Determine the equation of g(x) that results from translating the function f(x)=x^2+9 upward 15 units. A)g(x)=(x+24)^2 B)g(x)=(x + 15)^2+9 C)g(x)=x^26 D)g(x =x^2+24 
math
Select the approximate values of x that are solutions to f(x) = 0, where f(x) = 6x^2 + 4x + 7. 
math
Determine the equation of g(x) that results from translating the function f(x) = x^2 + 9 upward 15 units 
math
f(x) = (x + 2)^2 to the right 12 units 
math
Solve for in the equation x2  3x  40 = 0. 
math
Determine the equation of g(x) that results from translating the function f(x) = x^2 + 9 upward 15 units 
math
The range of f(x) = ax + b is the set of all real numbers given that a and b are real numbers. Which produces a counter example to her statement?  @lolz is right!!! that was extremely rude

math
Write an equation that uses 18  ? and 10 + 2. Explain how to decide which numbers would make it true.  U did bad u lied about that

Physics
A car traveling at a velocity of 24 m/s is accelerated uniformly at a rate of 2 m/s¶ for 8 seconds. What is the final velocity of the car? 
Physics
Police find skid marks 180 meters long on a highway where a car made an emergency stop. Assuming that the deceleration was a = 10 m/s¶ (about the maximum for dry pavement), how fast was the car traveling before the brakes were applied?  Ethical

Calculus
A 17 foot ladder is leaning against a wall. The bottom of the ladder is moving out away from the wall at 0.6 feet per second. The top of the ladder then begins sliding down the wall. How fast is the top of the ladder going when the bottom is 8 feet away from the wall?  Hydroxyl proton
 how did you get BE=32?

Flowers for Algernon book
Think about all the times knives or razors appeared in the story. How could they be symbolic? 
Flowers for Algernon
Explain Charlie's problems with women. Why does he have trouble getting close to them?