Sunday

February 7, 2016
Total # Posts: 893

**Calculus- Damon, Steve, Reiny**

I forgot to mention that I am trying to find sigma squared.. given that the mean is r and p(x)= (1/r)(e^(-x/r)) on the interval [0,infinity), where r>0.. note: sigma squared= integral sign (-inf, inf) (x-M)^2 p(x) dx i got (r^2 - 2r)^(1/2) for sigma, but my answer is wrong...
*November 28, 2015*

**Calculus- NEED HELP!!!**

I got r^2 - 2r.. and it is wrong.... please help....
*November 28, 2015*

**Calculus**

I tried to integrate this: intergral sign with an interval from -inifinity to + infinity function: (x-r)^2 (1/r) (e^(-x/r)) with respect to dx..... I know that Steve set up the u-substitution but I seem to never arrive at an answer... It seems like I keep integrating and ...
*November 28, 2015*

**Calculus**

How do you integrate (x-r)^2 (1/r) (e^(-x/r)) from the interval negative infinity to positive infinity?
*November 27, 2015*

**maths**

a bag contains three labelled A,R,C and a box contains 4 cards 1,2,3,5. if cards are picked from the bag and from the box, find the probability of picking on A and a prime number
*November 25, 2015*

**Calculus**

Calculate μ and σ, where σ is the standard deviation, defined by the following. σ^2 = integral between (−∞,∞) (x-μ)^2 p(x) dx The smaller the value of σ the more tightly clustered are the values of the random variable X about the...
*November 22, 2015*

**Chemistry**

Why does carbonate have a -2 charge and not -1? Why does phosphate have a -3 charge and not -2 or -1? Why does nitrate have a -1 charge and not -2 or -3? My answer: Based on the Lewis structure, these ions need a certain number of electrons in order to be stable...the octet ...
*November 22, 2015*

**Chemistry**

Rank the following in order of increasing bond polarity: H-F, H-Br, F-F, Na-Cl. Is it this....? F-F, H-Br, H-F, Na-Cl
*November 22, 2015*

**Chemistry**

Why does carbonate have a -2 charge and not -1? Why does phosphate have a -3 charge and not -2 or -1? Why does nitrate have a -1 charge and not -2 or -3? My answer: Based on the Lewis structure, these ions need a certain number of electrons in order to be stable...the octet ...
*November 22, 2015*

**math**

how much flour will be needed to make 3 pies if using 1 3/4 cups of flour? i need two ways of solving this question please
*November 17, 2015*

**Chemistry**

My final temperature was higher than my initial temperature, and my graph shows that the temperature icreases and then decreases. I thought that would make it exothermic, but dont exothermic reactions give off heat? If someone could clear this up, I would really appreciate it...
*October 18, 2015*

**Chemistry**

How can I tell from a graph of temperature vs. time if a reaction is endothermic or exothermic?
*October 18, 2015*

**8th Grade Science**

How do adaptations enable organisms to reduce competion for food and other resources PLEASE ANSWER BY 4 (50 MINS)
*October 18, 2015*

**Algebra**

Find the linear function with the following properties: f(0)=1 and the slope of f equals -3/2 THANK YOU
*October 10, 2015*

**Algebra**

The back of Tom's property is a creek. Tom would like to enclose a rectangular area, using the creek as one side and fencing for the other three sides, to create a corral. If there is 100 feet of fencing available, what is the maximum possible area of the corral? ? square ...
*October 5, 2015*

**Math 71x**

One cell phone plan allows 200 text messages per month for $20 after which text messages cost $0.04 each. Another cell plan allows 400 text essages per month for $30 each. What would be the minimum text messages that would justify the more expensive plan
*October 1, 2015*

**Stats**

estimate the probability that a patient has health insurance, if 59% of Americans have private insurance and 25% have government insurance. Estimate the probability that it is private insurance Is this P(A and B) = P(A) x P(B)
*September 27, 2015*

**Math**

Bob was riding his dune buggy. Part of the time he was riding at 10 mph and the remainder of the time at 14 mph. The total distance traveled was 68 miles and it took him 5 hours. How much time was spent traveling at 10 mph?
*September 27, 2015*

**Physical Science**

how much energy must be removed from 1 L of water at 25 C and turn it to ice at -10 C?
*September 23, 2015*

**Chemistry**

When 24.0 cal of heat is added to 18.5 g of aluminum at 19.0 ∘C, what is the final temperature of the aluminum?
*September 14, 2015*

**science**

a baby pushes a toy across the floor with a force of 5 newtons inertia balanced force unbalanced force velocity
*July 13, 2015*

**Statistics **

A random sample of 100 cable TV movies contained an average of 3.38 acts of physical violence per program. At the 99% level what is your estimate of the population value? mean = 3.38 s = 0.30 N = 100
*June 14, 2015*

**Bio**

Why do doctors recommend that people get a flu shot each new flu season? The vaccine wears out over time. The body eliminates the vaccine. The flu virus changes every year. The flu virus becomes immune to the vaccine.
*June 4, 2015*

**Science**

What do B cells do?
*June 4, 2015*

**Science**

n(No/N) = kt No = 100 N = 85 t = 5 days solve for k Then ln(No/N) = kt No = 100 N = ? solve for this amount remaining. k = from above t = 25 days N is what is left. (N/100)*100 = % left
*June 4, 2015*

**Biology**

OMG I did this one before!
*May 27, 2015*

**programming**

Using python write a program that does the following: •Create the logic for a program whose main() method prompts a user for 1000 numbers and stores them in a list. •Pass the array to a method that reverses the order of the numbers. •In the main program, display...
*April 17, 2015*

**Programming logic and design**

Using python write a program that does the following: •Create the logic for a program that calculates and displays the amount of money you would have if you invested $3000 at 2.65 percent interest for one year. •Create a separate method to do the calculation and ...
*April 17, 2015*

**physics**

dahnay carried a box (5,4)m.the box had a mass of 5kg.dahnay says that over 300J of work was done on the box . is dahnay correct?explain the answer.
*March 16, 2015*

**English **

What is the difference between the denotative and connotative meaning of a word?
*February 2, 2015*

**Ss help 8th **

Compare and contrast the experiences of the Creeks and Cherokees in Georgia following the War of 1812
*January 31, 2015*

**SS ANYONE HELP?**

you know any links i can find my answers? anything. i need help on this.
*January 31, 2015*

**SS ANYONE HELP?**

Describe significant events in the social and economic reconstruction of the South. Why are these events significant?
*January 31, 2015*

**PLEASE HELP CHECK? MS. SUE ANYONE?**

How is this so far? and what else should i add, i need two pages and i have only one done, due today. help? I'm doing like a journalist. I Josephine A. Walker was a slave for Harry Richardson. Every morning I had to serve him, I had to be up by 4am and was unable to go to ...
*January 29, 2015*

**SS**

How is this so far? and what else should i add, i need two pages and i have only one done, due today. help? I Josephine A. Walker was a slave for Harry Richardson. Every morning I had to serve him, I had to be up by 4am and was unable to go to bed till 12am midnight. I had to ...
*January 29, 2015*

**geography**

What are examples of human adaptation to the environment?
*January 22, 2015*

**Geography**

What role did the waterways of Europe play in the development of it's economy?
*January 21, 2015*

**Geography**

How are the landforms of Europe both an advantages and a disadvantage to life in Europe?
*January 21, 2015*

**Physics**

You are going diving in a pool of fresh water. Your body can only take a total pressure on it of 2.0 atmospheres. How deep can you dive before your body can no longer take the pressure?
*January 2, 2015*

**physics**

A toy boat has a volume of 0.0005m^3. It has a mass of 450 grams. How much of the boat is under fresh water?
*January 2, 2015*

**Physics**

A hot air balloon of radius 12 meters has been heated so that the air inside has a density of 1.05 kg/m^3. What can the total load of the balloon be (mass of balloon itself plus cargo) if you need the balloon to accelerate into the air with an acceleration of 4 m/s^2?
*January 2, 2015*

**algebra**

You deposit $3000 in an account earning 7% interest compounded continuously. The amount of money in the account after years is given by A(t)=3000 e^(0.07 t) . How much will you have in the account in 5 years? $ Round your answer to 2 decimal places. How long will it be until ...
*November 22, 2014*

**science**

A swimming pool measures 10m by 7m by 2m calculate the full force exerted by the water against the bottom. What is the pressure at the bottom due to the water?
*November 21, 2014*

**Accounting**

computer equipment beginning balance is 20,000 working on the adjusted general journal and the scenario is the computer has a 4 year life with no salvage value not sure how to log this
*November 15, 2014*

**science**

Bill kicks a rock off the top of his apt building it strikes a window across the street 18m away the acceleration of gravity is 9.8m/s if the window is 25m below the position where bill contacted the rock how long was it ini the air
*November 13, 2014*

**Chemistry 11**

Thank you guys so much for helping me! I see my steps were really unnecessary.
*November 12, 2014*

**Chemistry 11**

Find the percent composition of a compound containing sodium and chlorine if 24.34g of the compound contains 13.45g of sodium. My work: Molar mass of NaCl: MNa +MCl = 22.99 g/mol + 35.45 g/mol = 58.44 g/mol Percent composition of Na: 22.99 g/mol / 58.44 g/mol x 100 = 39.34% Na...
*November 12, 2014*

**Accounting**

34000
*November 3, 2014*

**science-gen chem**

if 0.969 g of CaCl2 is mixed with 1.111 g of KlO3 how many grams of solid Ca(IO3)2 can theoretically be made? CaCl2(aq) + 2KlO3(aq) ===> 2Kcl(aq) + Ca(lO3)2 (s)
*October 27, 2014*

**Language Arts**

In "The Finish of Patsy Barnes," why does Patsy want to race on Black Boy? (1 point) Patsy feels Black Boy owes him a win.** Black Boy is the best horse. Patsy wants to please Brackett. Patsy wants to prove he is a man. 2. What final events in "The Finish of ...
*October 1, 2014*

**math**

If the sun is aplroximantely 1.5×10^(11) meters from Earth, what is the approximate distance from Earth to Mars.
*September 22, 2014*

**College Chemistry**

Suppose there are two known compounds containing the generic elements X and Y. You have a 1.00-g sample of each compound. One sample contains 0.29 g of X and the other contains 0.38 g of X. Identify plausible sets of formulas for these two compounds. Check all that apply. XY ...
*September 3, 2014*

**Math**

The Mills Lunch Shop prepares fresh take-out entrees each day. On Tuesday, 40 baked chicken dinners were prepared at a cost of $3.20 each. A 20% spoilage rate is anticipated. Mills Lunch Shop sells the dinners at an 80% markup based on cost. They decided to offer a $1.00-off ...
*August 31, 2014*

**Geography**

Which geographic feature marks the last natural obstacle for Georgia’s rivers on their way to the Atlantic Ocean? (1 point) the Floridian Aquifer the Valley and Ridge region the Fall Line *** (MY ANSWER) the Marshes of Glynn AM I RIGHT?
*August 28, 2014*

**Tourism**

I don't know which career i must do with the subjects i chose
*August 25, 2014*

**Geography**

1. Is all of the above
*August 25, 2014*

**Geography**

1.Encouraging crops with longer growing seasons 2.both the first and third answer choices 3.the Fall Line 4.aquifer Am i right Ms. Sue?
*August 25, 2014*

**Geography**

Which of the following are impacts that the temperate climate has had on Georgia’s development? (1 point) encouraging crops with longer growing seasons drawing immigrants from other locations encouraging tourism all of the above 3. What impacts have precipitation and ...
*August 25, 2014*

**Geography**

Which of the following most accurately describes the difference between climate and weather? (1 point) Climate refers to long-terms conditions; weather refers to daily conditions. Climate refers to severe weather events; weather refers to precipitation. Climate refers to land ...
*August 25, 2014*

**Science**

Inductive reasoning is right(: A+
*August 15, 2014*

**Science**

In the early 1900s, Alfred Wegener noticed that some of the Earth's continents looked like they might fit together like a jigsaw puzzle. He also observed that the continents that looked like they fit together had similar plants, animals, and rock formations. From this ...
*August 15, 2014*

**physics**

Two mirrors are placed at a 90° angle to each other. A light ray strikes one mirror 0.730 m from the intersection of the mirrors with an incident angle of 36.5°. The ray then travels a distance d before reflecting from the second mirror. (a) What is the distance d?
*May 12, 2014*

**general science**

if an object is thrown 60 m into the air and it takes the object 6 s to get there, what's the average speed of the object? (A) 20m/s (B) 360 m/s (C) 100 m/s (D) 10 m/s
*May 5, 2014*

**Chemistry**

Write the class/family of the following compounds and the functional group in each compound. a. 3-methylcyclohexene b. Cis-3-octene c. 4-methyl-2-heptanone d. 3-bromobenzaldehyde e. 3-bromo-5-chlorotoluene f. 3-chlorophenol g. 6-methyl-2-heptyne Please help!
*April 22, 2014*

**Stats**

Find the P-value for a left tailed hypothesis test with a test statistic of z= -1.77. Decide wether to reject the null if the level of significance is alpha= 0.05. Please help I've tried everything and I can't figure out how to get the right answer..
*April 17, 2014*

**Hanus**

points Q (10,8) and R (24,10) are the endpoints of a diameter of a circle centered at P. Line l is tangent to the circle at S (12,14). What is the y-intercept of line l?
*April 11, 2014*

**Statistics**

In a survey of 621 males ages 18-64 , 396 say they have gone to the dentist in the past year. Construct 90% and 95% confidence intervals for the proportion. Interpret the results and compare the widths of the confidence intervals. Please show step by step. Thank you!
*April 7, 2014*

**Physics **

You are given a four-wheeled cart of mass 11 kg, where the distance between a wheel and its nearest neighbors is 2.1 m. Suppose we load this cart with a crate of mass 109 kg, where the crate's center of mass is located in the back-middle of the cart, 0.525 m from its ...
*April 6, 2014*

**Physics**

Suppose we take a 1 m long uniform bar and support it at the 27 cm mark. Hanging a 0.31 kg mass on the short end of the beam results in the system being in balance. Find the mass of the beam.
*March 28, 2014*

**Spanish2**

Está prohibido fumar. (Write advertisements or signs for the situations described. Use impersonal constructions with se.)
*March 17, 2014*

**Physics**

PE=.5kx^2
*March 13, 2014*

**pre-calculus**

Find the real and imaginary zeros for the following polynomial function. T(b)= 147b^3-35b^2-19b+3
*March 6, 2014*

**RE: Physics **

If an incline has a difference in height from one end to the other of 17.8 cm and has a length along the incline of 1.19 m, what is the angle that the incline makes with the horizontal reference surface? Physics - Damon, Saturday, February 15, 2014 at 5:20pm cos (angle) = .178...
*February 15, 2014*

**Physics**

So the answer is 81.4? My online homework says that it is wrong?
*February 15, 2014*

**Physics**

If an incline has a difference in height from one end to the other of 17.8 cm and has a length along the incline of 1.19 m, what is the angle that the incline makes with the horizontal reference surface?
*February 15, 2014*

**Chem**

what mass of hydrogen was in an unknown compound containing only c, h, and o if 2.65kg H2O was produced by combustion analysis
*February 12, 2014*

**US History**

gogle it it comes up on yaho answers. I would probably go with A too.
*February 11, 2014*

**US History**

The train I believe.
*February 11, 2014*

**physics**

In the circuit shown, find the voltage Vx (in Volts) if V = 17.0 Volts, R1 = 13.0 k ohms, R2 = 4.0 k ohms, R3 = 13.0 k ohms and R4 = 21.0 k ohms. Answer is -6.5 I don't understand how they got it, can someone please explain it with steps? Thanks tinypic. c o m/r/2pzhcpl/8
*February 11, 2014*

**Physics**

In the circuit shown, find the voltage Vx (in Volts) if V = 17.0 Volts, R1 = 13.0 k ohms, R2 = 4.0 k ohms, R3 = 13.0 k ohms and R4 = 21.0 k ohms. Answer is -6.5 I don't understand how they got it, can someone please explain it with steps? Thanks tinypic. c o m/r/2pzhcpl/8
*February 11, 2014*

**Physics**

If the resistances R1= 16. ohms, R2 = 38. ohms, and R3 = 18. ohms, and the voltage V = 6.0 volts, what is the current ix (in Amperes) in the circuit. tinypic .cm /r / nfr48k/ 8 The correct answer is .1443 but I want to know how they got that. Thanks.
*February 10, 2014*

**Math**

fgguhutgt6fgkhr
*February 3, 2014*

**science **

You measure the dimensions of a rectangular block of aluminum to determine its volume. It has the following dimensions. length = 10.27 cm; width = 4.92 cm; height = 1.53 cm Assuming that each of these measurements is accurate to the nearest 0.01 cm, find the volume of the ...
*February 3, 2014*

**Science**

The sensitivity of a measuring instrument is the value of the smallest quantity that can be read or estimated with it. What is the smallest part of a centimeter that can be read with the following? (a) a meterstick with markings at each millimeter I tried .01 mm .05 mm .1 mm ....
*February 3, 2014*

**Physics**

A test rocket is launched by accelerating it along a 200.0-m incline at 1.25m/s2 starting from rest at point A (the figure (Figure 1) .) The incline rises at 35.0 ∘ above the horizontal, and at the instant the rocket leaves it, its engines turn off and it is subject only...
*February 2, 2014*

**Physics**

A test rocket is launched by accelerating it along a 200.0-m incline at 1.25m/s2 starting from rest at point A (the figure (Figure 1) .) The incline rises at 35.0 ∘ above the horizontal, and at the instant the rocket leaves it, its engines turn off and it is subject only...
*February 1, 2014*

**Calculus **

Consider the solid obtained by rotating the region bounded by the following curves about the line x=1. y=x,y=0,x=4,x=6 Find the volume So it would be pi (integral from 3 to 6) of ((1-y)^2 -(1-0)^2) right? so then you integrate it and get pi(Y^3/3-y^2) from 3 to 6. ?
*January 29, 2014*

**Physics**

A 0.5 kg wooden block is dropped from a height of 15 m. At what height must a 5g bullet be traveling upward strike the block in order to momentarily stop its fall? Assume that the time required for the bullet to come to rest in the block in negligibly short, that no internal ...
*January 22, 2014*

**Physics**

An explorer in the dense jungles of equatorial Africa leaves his hut. He takes 41 steps at an angle 45∘ north of east, then 81 steps at an angle 60∘ north of west, then 49 steps due south. Assume his steps all have equal length. Save him from becoming hopelessly ...
*January 19, 2014*

**science/math**

A car traveling at the speed of 30.0 m/sec encounters an emergency and comes to a complete stop. how much time will it take for the car to stop if its rate of deceleration is -4.0 m/sec
*January 16, 2014*

**social studies**

What was the reason for Baltimore's successful shipyards?
*January 13, 2014*

**Social Studies**

1. Diversity most closely means (1 point) sharing cultural traits and practices with others. making up a whole of many different parts. being a member of a small ethnic group. having many similar regions next to one another. 2. How does life in Istanbul differ from life in ...
*December 10, 2013*

**Calculus **

The area A of the region S that lies under the graph of the continuous function is the limit of the sum of the areas of approximating rectangles. A = lim n → ∞ [f(x1)Δx + f(x2)Δx + . . . + f(xn)Δx] Use this definition to find an expression for the ...
*November 24, 2013*

**Science**

It is in ur lesson!
*November 18, 2013*

**Physics**

A boat is being towed through a canal by means of ropes which make a 45 degree angle to each other. If a force of 75N is applied to the rope, what is the resultant force pulling the boat forward?
*November 3, 2013*

**math**

My online homework says it is wrong. I tried it without the negative sign too
*October 20, 2013*

**math**

Two sides of a triangle have lengths 8 m and 24 m. The angle between them is increasing at a rate of 0.05 rad/s. Find the rate at which the area of the triangle is changing when the angle between the sides of fixed length is 135°. Round your answer to two decimal places. ...
*October 20, 2013*

**math**

Two sides of a triangle have lengths 15 m and 18 m. The angle between them is decreasing at a rate of 0.08 rad/s. Find the rate at which the area of the triangle is changing when the angle between the sides of fixed length is 120°.
*October 20, 2013*

**chemistry**

A lab tech had accidentally set out 16M HCl for this experiment. How much ( in mL) 16M HCl is needed to make 450mL of a 3M HCl solution?
*October 7, 2013*