Recent content by Physics1

bump!

C++! However, Java is replacing niches that C++ once held like in financial engineering. I don't think it'll replace really anything in engineering any time soon. BTW, I hate computer science. That field moves really fast!

I'm thinking of going to SDSU for electrical engineering with a couple of electives in power systems engineering. Is it a good idea to specialize in this sub-discipline? Is nuclear going to be a good field? I might go to grad school for either power systems or nuclear. I'm not sure nuclear is...

Well, actually I'm getting y = -2/3x + (5/3) for the tangent line now. I got it from those two points. Maybe f(x) is just a straight line and those 2 points can be used to find the whole line (slope).

Homework Statement y = 9sin(x)cos(x) Find all points where tangent line is horizontal. The Attempt at a Solution I get y' = 9cos^2x - 9sin^2X I plug in zero for the slope and get 9 but I'm stumped after that. How can I get all the horizontal tangent line points?

What about the point of the tangent line that's touching the function? It passes through points (-2, 3) and (4, -1) I got y = -(2/3)x + 13/3 for the tangent line using basic algebra. It says plug in f ' (3) and f(3) How would I know the original equation y = f(x)?

Let's say there's a function y = f(x). and a tangent line at x = 3. Is that the instantaneous unit (whatever you're measuring)?

Oh, so the derivative of f(x) is the change in total cost / change in quantity.

My teacher said there's an easy way (I'm assuming it's this way) and a hard way.

Well, c is irrelevant to what a and b are asking. It's a math class (not business calc). She just wants us to come up with a graph to convince her on part c. Most likely she won't be picky.

I see what I did wrong now. I did the quadratic wrong because I accidentally put a wrong number in so I had to do the quadratic equation which led to a wrong number. 3 works for a and the point is (3, 9). Isn't there another way to solve this?

Is a and b correct though? I'm not really worried about c.

y = mx + b I know. I did that but it isn't the correct answer when looking at the graph. I got y = 8x - 17. It doesn't touch the graph

Homework Statement A traveler in space is moving left and right on y = x^2. He shuts off the engines and continues on the tangent line until he reaches point (4, 15). At what point on the curve should he shut off the engines to reach that point? The Attempt at a Solution Ok, the...

It really said short term but I just put short run. It's basically the same thing. I can't do c without a graph. What about a and b?