I’m tall when I’m young, and I’m short when I’m old. What am I?

What statement is true about all chemical changes? a) chemical changes can be undone. b) chemical changes cannot be reversed. c) chemical changes change the color of objects. eliminate d) chemical changes do not form new products.

Why does the blending of many different diciplines present both challenges and opportunities to enviromental scientist?

Arandom variable x has a mean of 10 and a standard deviation of 3. if each value of x is multiplied by 2, what will the new mean and standard deviation be?