Friday
March 24, 2017

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Posts by dave

Total # Posts: 850

math
Amy leaves home at the same time every morning and gets to school exactly at 8 AM. If she traveled at 70 meters per minute she would arrive 10 minutes early. If she traveled at 60 meters per minute she would arrive 8 minutes early. What time does Amy leave home each morning?
March 15, 2017

Social studies
B and A
March 8, 2017

Social studies
Which of the following was the main contributor to finally bringing the United States out of the Great Depression? A the National Recovery Administration B the Good Neighbor Policy C wartime spending D the election of Roosevelt D or B ----------------------------------- Which ...
March 8, 2017

chemistry
For the reaction 2Na(s)+Cl2(g)?2NaCl(s)2Na(s)+Cl2(g)?2NaCl(s), how many grams of NaCl could be produced from 20 L of Cl2Cl2 (at STP)?
March 3, 2017

Calculus
The region enclosed by the graph e^(x/2), y=1, and x=ln(3) is revolved around the x-axis. Find the volume of the solid generated. I don't understand if we have to use the washer method or the disk method for this one because when I drew it out on a graph it looked very ...
March 1, 2017

Social Studies
Number 2 only has 1 answer
February 26, 2017

Social Studies
1. Which of the following apply to fascism? Select all that apply. A rooted in militarism B extreme nationalism C respect for minorities D blind loyalty to the state I think its A,B, and c ----------------------------------- 2. Which of the following best describes attitudes ...
February 26, 2017

Social Studies
Which action is often viewed as the most serious attempt to undermine the independence of the judiciary? A President Franklin D. Roosevelt’s plan to reorganize the Supreme Court B appointment of Supreme Court justices to unlimited terms of office C periodic increases in ...
February 23, 2017

Social studies
Lol thx man
February 23, 2017

Social studies
Which of the following factors was most responsible for an unequal distribution of wealth? A There was an increase in business profits. B Wages were not keeping pace with profits of business owners. C Wages were not keeping pace with profits of business owners. D There was ...
February 23, 2017

physics
an object starts from rest and accelerates uniformly to a speed of 100 m s^-1 after 5s. calculate the acceleration of the object.
February 7, 2017

math
Fido weighs 26 pounds more than Fifi. Fifi weighs 12 pounds less than Rover. If the sum of their weights is 71, how much does Fifi weigh?
February 4, 2017

Math
A basket ball team scored a total of 160 points. they made 74 baskets. how many 2 point and how many 3 point shots?
January 22, 2017

math
The perimeter of the isosceles triangle is 28 cm.and side a is equal to (x+2y) while side b is equal to (6y-2x+1) and side c is equal to 4y all in cm.find x and y and hence state the lengths of the side of the triangle
January 22, 2017

maths
whats yearly intrest on 52 grand in a isa at intrest rate 1.5 yearly
January 20, 2017

Maths
If the volume of a cylindrical block is equal to 800cm^3 prove that the total surface area is equal to 2(pi)x^2 + (1600)/x, where x cm is the radius of the base. hence obtain the value x which makes the surface area a minimum.
January 4, 2017

Math
65*50=3250ft^2 so 1625/3250 0.5$/ft^2
January 4, 2017

math
Amy & Ashley bike along the same trail. Amy bikes the entire trail at 20mph & Ashley bikes at 15mph. Amy finishes 8 minutes before Ashley. How many miles long is the trail?
December 13, 2016

Chemistry
Suppose you titrated a sample of sulfuric acid (diprotic acid) with a 0.250 M solution of NaOH. Given the data in the table below, what is the concentration of the sulfuric acid solution?
December 6, 2016

Math
f(x) = cos(x) + 3x Find f^-1 (1) and (f^-1)' (1) f^-1 (1) = 0 (f^-1)' (1) = 1/3 These are the answers given, but I also don't understand how my teacher got these.
December 5, 2016

Math
Actually I do have one question, how do we know that x is 1 already ???
December 5, 2016

Math
Thank You so much!
December 5, 2016

Math
f(x) = x^5 + 2x^3 + x - 1 Find f^-1 (3) and (f^-1)' (3) f^-1 (3) = 1 (f^-1)' (3) = 1/12 Those are the answers, but I have no clue how my teacher got them.
December 5, 2016

Math
lim 200 (30-t)^2 h->0 t=10 The answer should be -8000, but I keep getting -80,000 because I have to do it the long way.
December 1, 2016

math
a truck weighting 20000 pounds going 5 mph what is the force of the truck when it hits a person and comes to a complete stop?
November 5, 2016

Math
There is a graph of a function that looks like y = x^4 , but it has a vertical asymptote at x = -2 and x = 4. The question then asks us to arrange the following numbers in decreasing order: g'(1), g'(-2), g'(0), g'(2), g'(4) I figured out all of the slopes...
November 3, 2016

Math
Is the step function differentiable in its domain? I answered it and said that the step function is not differentiable in its domain because it is not continuous. For the a function to be differentiable it would need to have a value and a limit. However, the step function has ...
November 3, 2016

Mats Exercise 1.7
g (x)= 2\3 (2/3x) (x-2) (x+1)
October 25, 2016

Math
Find the 999th derivative of cos x. I got sin x.
October 20, 2016

Math
lim (cos(π/4 + h) - cos (π/4)) / h h->0
October 20, 2016

Math
lim (cos(π/4 + h) - cos (π/4)) h->0 _________________________ h Somehow I ended up with cos(1).
October 20, 2016

Math
Use the quotient rule to find the derivative of cot x. I tried to solve this, but somehow I got (sec^2x)/(tanx)^2.
October 20, 2016

physics
Identify the force that propels a rocket. 1)The rocket is propelled by the reaction force of the exhaust gasses bouncing off the air molecules outside the rocket. 2)The rocket is propelled because the action force of the rocket on the exhaust gases is greater than the reaction...
October 18, 2016

physics
Identify the force that propels a rocket. 1)The rocket is propelled by the reaction force of the exhaust gasses bouncing off the air molecules outside the rocket. 2)The rocket is propelled because the action force of the rocket on the exhaust gases is greater than the ...
October 18, 2016

math
find the lcm for 6, 18
October 16, 2016

History
What kind of scenes did artists who gained fame tend to paint in the late eighteenth century. Give an example.
October 13, 2016

US History
What kind of scenes did artists who gained fame tend to paint in the late eighteenth century. Give an example.
October 13, 2016

Math for Reiny
your derivative is correct. now just plug in x = π/2 to get the slope remember that tan(π/2) is undefined, BUT cot (π/2) = cos(π/2) / sin(π/2) = 0/1 = 0 so slope = -csc^2 (π/2) = 2 I calculated and got -1 as the slope. Can you please explain how ...
October 12, 2016

Math
Find the inverse of: y = ((-1) / (x+5)) - 1
October 12, 2016

Math for Reiny
your derivative is correct. now just plug in x = π/2 to get the slope remember that tan(π/2) is undefined, BUT cot (π/2) = cos(π/2) / sin(π/2) = 0/1 = 0 so slope = -csc^2 (π/2) = 2 I calculated and got -1 as the slope. Can you please explain how ...
October 12, 2016

Math
I calculated and got -1 as the slope. Can you please explain how you got 2 for the slope?
October 11, 2016

Math
Find an equation for the tangent line to the curve at (π/2 , 2). y = 4 + cot(x) - 2csc(x) I am confused how to take the derivative of this problem. When I tried to solve it I ended up with -csc^2 (x) + (2csc(x) * cot(x)). From there I can't seem to simplify it. Also, ...
October 11, 2016

Physics
Why does the force of gravity change the speed of a satellite in an elliptical orbit? 1)The force of gravity is always tangent to the satellite motion. 2)Gravity speeds up the satellite as it moves away and slows it on its return. 3)The force of gravity is always perpendicular...
October 7, 2016

Physics
Why does the force of gravity change the speed of a satellite in an elliptical orbit? 1) The force of gravity is always tangent to the satellite motion. 2)Gravity speeds up the satellite as it moves away and slows it on its return. 3)The force of gravity is always ...
October 7, 2016

Physics
How can gravity be simulated in an orbiting space station? 1)aped like a bicycle wheel 2)Spin two pods connected by a cable 3)Rotate a cylinder to create centrifugal force as viewed by a person on the inside of the curved outer wall 4)All of the above
October 7, 2016

Physics
Which of the following is an element? H2O Hydrogen Carbon dioxide A supernova
October 7, 2016

Physics
Which two factors mainly affect ocean tides on Earth? Check two answers. Earth's revolution about both the Moon and the Sun the Moon the Sun the pull of distant planets
October 7, 2016

physics
I cant find the exact answer from above 3 answers.
October 7, 2016

physics
The concept of pressure involves both force and volume. force and area. area and volume
October 7, 2016

Physics
Why does the force of gravity change the speed of a satellite in an elliptical orbit? 1)The force of gravity is always tangent to the satellite motion. 2)Gravity speeds up the satellite as it moves away and slows it on its return. 3)The force of gravity is always perpendicular...
October 7, 2016

Physics
A dike in Holland springs a leak through a hole of area 0.80 cm2 at a depth of 1.2 m below the water surface. How much force must a boy apply to the hole with his thumb to stop the leak?
October 6, 2016

Physics
A dike in Holland springs a leak through a hole of area 0.80 cm2 at a depth of 1.2 m below the water surface. How much force must a boy apply to the hole with his thumb to stop the leak?
October 5, 2016

Physics
A dike in Holland springs a leak through a hole of area 0.80 cm2 at a depth of 1.2 m below the water surface. How much force must a boy apply to the hole with his thumb to stop the leak?
October 5, 2016

Math
Find 2 tangent line equations to the curve y=x^3+x at the points where the slope of the curve is 4. What is the smallest possible slope of the curve? At what x-value(s)does the curve have this slope? So far I have figured out the derivative of this function is y'= 3x^2+1. ...
October 5, 2016

Math Pre- Algebra
2 (75+7.50) or (75+7.50) (2) The total should be 165 dollars.
October 5, 2016

Math
lim as x approaches negative infinity (3x^5 + 6x + - 3) / (8x^4 + 10) a. Does Not Exist b. 0 c. -3/8 d. 3/8 I solved this and got negative infinity as the answer, but none of the answers are listed above. I finally chose Choice C, but my teacher said the correct answer is A?
September 26, 2016

Math
lim as x approaches negative infinity (3x^5 + 6x + - 3) / (8x^4 + 10) a. Does Not Exist b. 0 c. -3/8 d. 3/8 I solved this and got negative infinity as the answer, but none of the answers are listed above. I finally chose Choice C, but my teacher said the correct answer is A?
September 26, 2016

Calculus
Construct a function f : R 2 ¡æ R such that its saddle points are given by {(n, 2m+1−n)|n ¡ô Z, m ¡ô Z}, where Z is the set of integers.
September 26, 2016

Math
The limit as x approaches negative infinity is (3x^5 + x + 2) / (8x^4 - 5) a. DNE b. 0 c. -3/8 d. 3/8 I think the answer is Choice C, but I was stuck between this answer and Choice D.
September 23, 2016

History
They systematic raiding of the Athapascans shows that organized warfare is most clearly identified with: a. there is no record of either society initiating organized warfare b. both farming and hunting societies c. neither hunting nor farming societies d. farming societies ...
September 14, 2016

History
The map of northeastern region of North America shows the tribes of the Iroquois Confederacy: a. in a staked formation south of the st. lawrence river b. arranged like fingers south of lake ontario c. formed in the shape of a necklace north of the ohio river
September 14, 2016

History
I chose choice A.
September 14, 2016

History
Teotihuacan like other early urban civilizations was a. self sustaining and unconcerned with long distance trade as a result of its abundant food supply and specialization of labor b. controlled as an elaborate state sponsored trading system that stretched from present day ...
September 14, 2016

History
They systematic raiding of the Athapascans shows that organized warfare is most clearly identified with: a. there is no record of either society initiating organized warfare b. both farming and hunting societies c. neither hunting nor farming societies d. farming societies ...
September 14, 2016

Chemistry
1.0 ml
September 1, 2016

Math
380/95 is exactly 4 hours.
August 31, 2016

Maths
I have a wheel 40 cm diameter that has 200 N m of torque, assuming there is no slippage what would the force of the wheel on the road? How do I work it out please?
August 16, 2016

Civics
To become a law, typically a bill must be approved by: a. The House of Representatives, the Senate, and the President b. The House of Representatives c. The Senate d. The Supreme Court I chose Letter A, but someone how my teacher said it was incorrect. I was completely shocked...
July 19, 2016

Civics
To become a law, typically a bill must be approved by: a. The House of Representatives, the Senate, and the President b. The House of Representatives c. The Senate d. The Supreme Court I chose Letter A, but someone how my teacher said it was incorrect. I was completely shocked...
July 18, 2016

Civics
I think C is the correct answer.
July 18, 2016

Civics
What limits the amount of legal immigrants to our country? a. Tariffs b. Census c. Quotas d. Passports I couldn't find this question on any sources online. My teacher originally gave us this question on the review packet with no answer right answer to it. So, I just ...
July 18, 2016

Civics
Thank you so much for your help Writeacher!!!
July 18, 2016

Civics
I think it was 5 years at least. Thank you so much for your help Ms. Sue!!!
July 18, 2016

Civics
Hi Ms. Sue! I couldn't find anything on the declaration of intention on the website provided. I thought that Letter B wouldn't part of the process, but you need to have a basic understanding of the gov't and english to pass the test. And to do this you need to take...
July 18, 2016

Civics
I chose Letter A, but my teacher said it was incorrect. I don't know what is the correct answer for this one.
July 18, 2016

Civics
Which of the following is NOT part of the naturalization process? a. Filing a Declaration of Intention b. Taking a US history, gov't, or English language class c. Living in the US for 10 years d. Taking an Oath
July 18, 2016

Civics
health, safety, and moral standards of the community
July 18, 2016

Civics
I chose Letter D, but my teacher also said that it was incorrect.
July 18, 2016

Civics
Our rights are sometimes restricted in order to protect: a. those that are offended easily b. health, safety, and moral standards of the community c. the government from being overthrown d. individual rights
July 18, 2016

History
To become a law, typically a bill must be approved by: a. The House of Representatives, the Senate, and the President b. The House of Representatives c. The Senate d. The Supreme Court I chose Letter A, but someone how my teacher said it was incorrect. I was completely shocked...
July 18, 2016

physics
The contestants at a cycling race travel around a 0.5km radius track. The peloton travels 33 laps in 1 hour to complete the race. What is the total angular distance they have traveled? On the first lap, they start from rest and after traveling ½ the circumference of the...
June 30, 2016

physics
The general form of a number in scientific notation is a x 10n, where a must be between 1 and 10, and n must be an integer thus 100 is 1x10^2 indicating 2 zeros or decimal moved 2 places now .001 is 1x10^-3 as it moved the opposite way. there are 2.2 cm in an inch so there are...
June 27, 2016

Algebra
Wrong. It can't be 32miles per hour as x 4 hrs that is the full 128 miles. What happened to the slower cyclist? Distance = speed x time Let s stand for cylcist 1 speed. Therefore cyclist 2 speed must be 3s. The equation then looks like this 128 = 4s x 4 128 = 16s 8 = s so ...
June 15, 2016

Math
A pharmaceutical salesperson receives a monthly salary of $2500 plus a commission of 7 percent of sales. Write a linear equation for the salesperson monthly wage in terms of monthly sales.
June 7, 2016

Physics
The worker pushes with a force of 10 N that points downward at an angle of 45° below the horizontal. What component of the force moves the crate forward? I do not know how to set up this problem, so any help would be appreciated.
May 31, 2016

Math
a geometric progression has a third term of 20 and a sum to infinity which is three times the first term. find the first term
May 12, 2016

Math
a sum to infinity which is three times the first term. find the first term
May 12, 2016

Science
Free fall
May 10, 2016

Calculus
Use Simpson's rule with n = 4 to approximate. Keep at least 2 decimal places accuracy. Integrate: (cos(x))/(x) x=1 to 5
May 3, 2016

chem
Determine the mass of oxygen in a 7.2-g sample of Al2(SO4)3
April 18, 2016

chemistry
A sample of water is known to contain 1.51 × 10^24 H2O molecules. How many moles of H2O molecules are present in the sample?
March 22, 2016

Math Algebra Intermediate
How do I Factor the expression a y - a^{6} y^{6} ?
March 4, 2016

Chem
What type of orbitals are used to form the N–N bond in hydrazine, N2H4?
March 2, 2016

Chemistry
What set of hybrid orbitals is used by Xe in XeO3F2? dsp2 d2sp3 sp3 dsp3 d2sp
March 2, 2016

Marshall Middle
Of 450 lunches old at school on Thursday, 40% were hamburgers and the rest were pizza. How many  more pizza lunches were sold than hamburgers?
February 28, 2016

Trig
a 12-ft-long guy wire is attached to a telephone pole 10.5 ft from the too of the pole. If the water forms a 52 degree angle with the ground, how high is the telephone pole?
February 17, 2016

maths
a sheet of 8 x 4 ply how many sheets to cover 13ft 6 x 13 ft
February 16, 2016

Math
Can somebody show or explain this to me: Change 6 2/3% to fraction and .6 1/3 to a decimal or fraction.
February 13, 2016

Finance
Celeste just borrowed 47,500 dollars. She plans to repay this loan by making equal quarterly payments of 3,126.28 dollars for 19 quarters. If she makes her first quarterly payment later today, then what is the quarterly interest rate on the loan?
February 1, 2016

Check my Essay Plz?!
9/10
January 25, 2016

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