**

No trouble to cross-reference assignments. It needed to be done and took less than an hour.

Your work looks good.

Be sure to email me at both of my addresses, in case you didn't do so.

Remember to look for my responses under Messages at the bottom of the homepage, in case these responses are late in getting to you.

You need to understand that you are pretty far behind schedule in these courses. There are a total of 20 weeks of assignments, and you are still working on the first week. Your work looks good--you clearly have the ability and background to do the work. But you need to spend much more time on these courses. At an absolute minimum you need to finish Precalculus I before your Fall term starts, which would most likely prepare you to start calculus (you would have to check that out at your high school); this would mean that you would have to double up and finish Precalculus II before you reach the stuff that depends on it (not sure exactly how the high school's calculus sequence goes, but that would be probably be mid-Fall at the earliest).

As I told you earlier, you have to put the hours into the work to get through it. Figure 80 hours minimum per course. Let me know what I can do to help.

Dave Smith

**

Mr. Smith,

Yes, putting the class note numbers with the assignments helped, but I hope

it wasn't too much trouble. I am sending my flow model data in this set and

later i will send the grade and assignments data.

**

Your model seems appropriate.

If y stands for depth and t stands for time, then you are correct in substituting 46 for t to find depth at t = 46 sec. To find the time when depth is 14 cm, you have to realize that y stands for depth. Thus you substitute 14 cm for y. This gives you a quadratic which you then solve (get it into the form a t^2 + b t + c = 0 and use the quadratic formula).

Dave Smith

**

Mr. Smith

I have obtained the model for the assignments-grades data.

Would you mind to comment on the first 2 questions of this part of the

exercise. How to find the percentages,etc. And on the comet, I am just

confused about how to get those answers, the range of 25 to 100 watts??? I

will go ahead and obtain models for each and await your reply.

Thanks

**

Your model should give you y = grade average vs. x = percent of classes reviewed, with y a quadratic function of the form y = a x^2 + b x + c (numbers in place of a, b and c). Now if grade average is 3.0, what does that do to the equation (where would you substitute the 3.0)? What is grade average is 4.0? If 80% of the classes are reviewed, what does that do to the equation?

I could ask these questions more clearly if you had given me your model--could have made sure that your model made sense, also. Whenever asking a question it's best to provide all the information you can.

For the comet, you again get a model of form y = a x^2 + b x + c. What is the meaning of y? What is the meaning of x? Where would illumination 25 watts / m^2 go into the equation and what could you then determine? Same for 100 watts / m^2.

Dave Smith

** 

_______________________________________________________________