Sunday
December 11, 2016

# Posts by Hal

Total # Posts: 42

Algebra
Can you answer my other question?
November 10, 2016

Algebra
A map of Utah has a scale of 1 cm:30 mi. The border of Utah and Wyoming measures about 3.7 cm. How long is the actual border of Utah and Wyoming? Round the answer to the nearest 10 miles. I think it's 110 mi. Am I right?
November 10, 2016

Algebra
The sides of a square are increased by a scale factor of 6. The perimeter of the smaller square is 10 ft. What is the perimeter of the larger square? Is 60 Ft Correct?
November 10, 2016

Algebra
Thank you
November 10, 2016

Algebra
In 8 months, 55.6 gallons were used. Find the unit rate. Is the answer 6.95
November 10, 2016

C++
This is the correct code #include "iostream"//include statement(s) #include "iomanip" #include "fstream" using namespace std;//using namespace statement(s) int main() { char filename[17]; cin >> filename; ifstream in_stream; ofstream ...
June 30, 2016

Chemistry
Wow DrBob222, thanks for the clear and concise explanation.
December 1, 2015

Chemistry
Another question very similar to the one stated above. Suppose 1.00 x 10-2 mol of KOH and 1.0 x 10-4 mol of HCI are both added to 1.00 L of water. Calculate the [H3O+] and [OH─] of the resulting solution.
December 1, 2015

Chemistry
Calculate the hydronium and hydroxide concentration of a solution made by mixing 100 mL 0.020 mol/L NaOH and 25.0 mL of 0.040 mol/L HCl. I'm having trouble knowing where to start with this question.
December 1, 2015

Geometry
student 3
June 20, 2015

Math Help
The length of Joe's rectangular garden is 1 meter less than twice its width, and its area is 120m^2. Find the dimensions of the garden by setting up a quadratic equation and define its variables.
May 13, 2014

physics
A 45 kg boy is holding a 12 kg pumpkin while standing on ice skates on a smooth frozen pond. The boy tosses the pumpkin with a horizontal speed of 2.8 m/s towards a 37 kg girl who catches it. The girl is also wearing ice skates. What are the final speeds of the boy and the girl?
March 3, 2014

algebra
Could you show me how to do these math systems and show your work so i understand how to do them. 1) 3x+2y+4z=19 2x-y+z=3 6x+7y-z=17 2) 5x+8y+6z=14 2x+5y+z=12 -3x+6y-12z=20 3) x^2+2xy-2y^2=-11 x^2+xy-2y^2=-9
April 8, 2013

Quantum Physics
In Problems 1 to 5 we will work through example of QFTM for M = 6. Problem 1: What is w? You can use e, pi, and M in your response. Please do not subtitute 6 for M. Specify the probability amplitudes. You should use w to denote w, but please fully simplify your answer such ...
March 20, 2013

chemistry
NO.17=B
April 23, 2012

physic
a) impulse = Force * time of interaction i = 950N *.0044s = 4.18N-s don't know how to do B
December 4, 2011

Algebra 2
THANK YOU SO MUCH! :D
November 16, 2011

Algebra 2
The problem is 3x^2 - 26 + 35 (We have to factor it!) So, I did the problem, but I'm not sure how to write the final answer. This is what my problem looks like so far: 3x^2 - 26 + 35 (3x^2-21x)-(5x+35) 3x(x-7)-5(x+7) and this is where I have the problem. I know I need to ...
November 16, 2011

physics
A sports car moving at constant speed travels 120 m in 5.1 s. If it then brakes and comes to a stop in 4.0 s, what is its acceleration? Express the answer in terms of g's, where g = 9.80 m/s2. (Take the positive direction to be the direction of travel.)
August 18, 2011

chemistry
Calculate the equilibrium constant at 25 C for CH4 + 2 H2O --> CO2 + 4H2 given: delta G for CH4 = -50.81 H2O = -228.6 CO2 = -394.4 H2 = 0
August 1, 2011

chemistry
Re-post ? [H3O+] in 0.15 M C2N2H8 and 0.35 M C2H2H9Cl; Kb= 4.7 x 10^-4
July 20, 2011

chemistry
? [H3O+] in 0.15 M C2H2H8 and 0.35 M C2H2H9Cl
July 20, 2011

chemistry
I. balanced equation: Ca(HCO3)2 + HCl ->CaCl2 + 2 H2O + 2 CO2 II. find moles of Ca(HCO3)2 : 40.3 mL x 1 L/1000mL x 0.2 mole/L = 8.06 x 10^-3 moles Ca(HCO3)2 III. find moles CO2 : [8.06 x 10^-3] moles Ca(HCO3)2 x 2 moles CO2/1 mole Ca(HCO3)2 = 1.61 x 10^-2 moles CO2 IV. find...
July 20, 2011

Chemistry
How much sodium carbonate is needed to precipitate nickel sulfate
March 24, 2011

Chemistry
How much sulfuric acid is neede to dissole 200 pounds of nickel powder
March 24, 2011

Social Studies
Where was the first civilization? What was the region called then and now?
January 9, 2011

calculus
Consider line segments which are tangent to a point on the right half (x>0) of the curve y = x^2 + 1 and connect the tangent point to the x-axis. If the tangent point is close to the y-axis, the line segment is long. If the tangent point is far from the y-axis, the line ...
November 14, 2009

calculus
And isn't (c^4-2c^2+1)/(4c^2) supposed to be (c^4+2c^2+1)/(4c^2)?
November 13, 2009

calculus
Can you explain to me how you found out the distance formula. Because how did you find out D^2 = c^4 + 2c^2 + 1 + c^2 - c^2 + 1 + (c^4-2c^2+1)/(4c^2)? I understand the first part with c^4 + 2c^2 + 1, but I don't understand how you got the second part.
November 13, 2009

calculus
Thanks so much, but then do you plug in c back into the first point and tangent line and x-intercept to get the x and y coordinates and tangent line equation and x-intercept, respectively?
November 13, 2009

calculus
Consider line segments which are tangent to a point on the right half (x>0) of the curve y = x^2 + 1 and connect the tangent point to the x-axis. If the tangent point is close to the y-axis, the line segment is long. If the tangent point is far from the y-axis, the line ...
November 13, 2009

english
explain which groups of people make up the "britons" and anglo-saxon culture in beowulf
October 7, 2009

Pre-Cal
Wouldn't it be: x^2/4 - (y-1)^2/(9/5)=1 because that's what you get plug b^2 back into the original equation?
May 2, 2009

Pre-Cal
(-2,1) and (2,1) are the vertices.
May 2, 2009

Pre-Cal
(-2,1) and (2,1) Passes through (5,4) What is the standard form of the equation of the hyperbola?
May 2, 2009

Can someone help me unscramble this Spanish word: sssatlfrieeu'
January 12, 2009

Geometry
What is the surface area of a right prism that has these dimensions? Base- 11" x 15 " Back- 10" x 15" Front-?
April 15, 2008

Dynamics
Err, I typed that wrong. The acceleration is in fact constant. The velocity on the other hand is increasing at a constant rate so at some point the velocity will be greater than the friction force can hold. I just can't put it all together.
April 7, 2008

Dynamics
The acceleration increases at a constant rate, it does not remain constant. Thanks for replying, though. I'm still having trouble with it.
April 7, 2008

Dynamics
I should add, the answer is given as 11.32s, I just don't know how to get there. Thanks again.
April 7, 2008

Dynamics
A series of small packages are being moved by a thin conveyor belt that passes over a 300-mm radius idler pulley. The belt starts from rest at time t=0 and its speed increases at a constant rate of 150mm/s^2. Knowing that the coefficient of static friction between the pacakges...
April 7, 2008

chemistry
What will be the final temperature of the water in an insulated container as the result of passing 5.00 g of steam [H2O(g)] at 100.0°C into 195.0 g of water at 20.0°C? (?H°vap = 40.6 kJ/mol H2O) The best way to do these problems is to make the heat gained + heat ...
October 12, 2006

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