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2008-10-11 Algebra - need help: P = 2F and (P+F)3 = 405 so F = 45mph and P = 90mph If the distance each way is D and his rate going out is r, then D/r + D/3 = 6 which means you have only one equation and two unknowns, leading to...
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2008-10-10 Calculus - Optimization: Hi Gracie, I cant see the diagram but i picture the situation. You end up with a box with a height x and a square base of length y = 12 - 2x. The volume of the box can therefore be expressed as V = xy^2...
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2008-10-10 Calculus - Optimization: The volume would be hb² where h is the height and b is the base. Notice that 2b² + 4bh = 253.5, so h can be solved for. Once you have h, put it back into the equation for volume, hb². Take the derivative...
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2008-10-10 Calculus - Optimization Problem: Ok, let's set x & y are the dimensions of the fence. Then the perimeter of the rectangular fencing will be f=2x+y. ("Note that y instead of 2y because the river side do not require fencing"). Ok, we...
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2008-10-10 General Writing and Grammar Help - subjunctive: Hi Pat, I have printed below some explanations of the subjunctive mood to give you a clearer idea of this rather complex form of English: When verbs show something contrary to fact, they are in the...
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