# 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*

**7th grade**

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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