Robert J.

07/14/13

At 1 atm, how much energy is required to heat 77.0 g of H2O(s) at –12.0 °C to H2O(g) at 121.0 °C?

I've tried this process over and over again and keep getting extremely high numbers... what am I doing wrong? Enthalpy of fusion 333.6 J/g 6010. J/molEnthalpy of vaporization 2257 J/g40660... more

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Math

07/14/13

Find the balance?

An investor deposits $1000 in an account paying interest at a rate of 8% compounded monthly, and also makes additional deposits of $25 per month. Find the balance in the account after 3 years.

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Mathmatics

07/12/13

Without using a calculator, evaluate (lg 5)^2 + lg2 lg50

Without using a calculator. Answer=1

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Math

07/12/13

Solve the difference equation?

Solve the difference equation yn+1=(n+1)/(n+2) yn in terms of the initial value y0. Answer: yn=y0/(n+1)

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Math

07/12/13

Solve the difference equation?

Solve the difference equation yn+1=(n+1)/(n+2) yn in terms of the initial value y0. Answer: yn=y0/(n+1)

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Algebra 1

07/10/13

What is the equation of the line that passes through (1, 2) and is parallel to the line whose equation is 4x + y - 1 = 0?

algebra 1 , functions

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Math

07/09/13

2 1/2 plus 4 2/3

What is 2 1/2 plus 4 2/3

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Math Help Math Question

07/09/13

remainder 43, quotient 344, dividend 43 043

The question is: The remainder is 43. The quotient is 344. The dividend is 43 043. What is the divisor?

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Math Question

07/09/13

Hard Math Question - stuck, please help.

can you please help me prove this: If a1.a2.a3...an=1 and n>=3, the prove that: (1+a1)1(1+a2)2....(1+an)n>nn

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Other

07/08/13

Find approximate values?

Find approximate values of the solution of y'=3+t-y, y(0)=1 at t=0.1, 0.2, 0.3, and 0.4 using the Euler method with h=0.1.

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Other

07/07/13

what is the equation to x 2+ 12 x - 64 = 0

Whqt is the equation to x 2+ 12 x - 64=0

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Precalculus Precalculus Homework Unit Circle

07/07/13

Precalc Question -- Find Angle Measure in Radians for -0.6 Rotations

What angle measure, in radians, corresponds to −0.6 rotations around a unit circle? (Round your answer to two decimal places.) The book gives the answer (-3.77) but not the process of how to get... more

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Other

07/07/13

Solve the differential equation?

Solve the differential equation y dx+(2xy-e^(-2y))dy=0. I know that the integrating factor is e^2y/y. e^2y dx+2x(e^2y)-1/y dy=0 Now what? The answer is xe^2y-ln abs(y)=c, y=0. Can you explain... more

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Algebra 1

07/07/13

factor x^4(x^2+5x-14)-16(x^2+5x-14)

please show work

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Sequences

07/07/13

What is the next number in the sequence 3,9,-1,-4,-15

can't find a pattern. can you help

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Algebra 1

07/06/13

find the vaule of x or y that the line through the points has the given slope

(-7,-1) and (x,5):slope 3/4 please help ive tried to solve but i cant

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Algebra Word Problem

07/06/13

parking in a city lot cost $2 for the first half hour and then $1.75 for each hour there after. A partial hour is charged the same as a full hour. What is the l

It is a algerbra word probel

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Answers •1

Differential Equations

07/05/13

Solve the differential equation?

Solve the differential equation dx+(x/y-sin(y))dy=0. I know that the integrating factor is y. y dx+x dy-ysin(y) dy=0 d(xy)-ysin(y) dy=0 How do I integrate this?

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Math

07/05/13