Recent content by 60051

Say you have an example like: u = x2y2 So du/dx = 2xy2, and du/dy = 2yx2. So how do you tell if the graph is always rising or falling?

What if there are two variables?

The textbook says it's a way of transforming a set of numbers into another set that preserves the order. But I don't understand what that means. Here are a few examples. The question was: do these functions represent a monotonic transformation. u = 2v - 13 (yes) u = -1/v2 (no) u =...

Alright, so the ratio is 1/2. But I still don't understand how you find what your income is.

I meant 4/12:6/2, since it's supposed to be a ratio.

Homework Statement Your budget is such that if you spend your entire income, you can afford either 4 units of good x and 6 units of good y OR 12 units of x and 2 units of y. A) What is the ratio of the price of x to the price of y? B) If you spend all your income on x, how much x could...

The answer given is 0, even though 24 also works, as we have seen. So what's the deal? Are there two determinants?

Homework Statement Find the determinant of the following matrix: 4...0...1 19...1...-3 7...1...0 I chose the 1st row to do the operations on. 4 [(1*0) - 1*(-3)] + 1 [19*1 - 7*1] = 4[0 - (-3)] + 1[12] =12 + 12 =24 I can't see any mistakes in that, but it's...

Homework Statement So if you have an expression like this, what does the E (GPA|SAT) part mean and how is it read? E (GPA|SAT) = .70 + .002SAT

Not sure if vectors are pre or post calculus Homework Statement So we had a few examples of vector multiplication in class and I don't understand something. The following vectors were multiplied: But in another example, So why was the answer in the first example a...

How did you get 0.475? 0.95/2?

I made sure this chart is identical to the one in my textbook, so there are no discrepancies. So in the solutions manual, they find alpha by subtracting the confidence coefficient from 1, then dividing that value by 2, and looking up that value in the table. So for one example, they used...

Alright, so 0.7995 corresponds to 0.84 and 0.83523 corresponds to 0.9775. But when I plug these values in and solve for x, I get virtually the same answers (3.1 and 3.11). How can that be?

I searched for a z-score table, but I don't know how to read it. On one axis they have z-scores and along the other axis are decimal values, but what are these values? How do I find 0.84 and 0.975 if they're not listed?

One last bump. I really need some guiding words!