Why is compression a "hard problem" for computers? draw on your own experience compressing text with the text compression widget. is there a way to know when you've compressed it the most? explain why you can or can't know.?

Ineed a good science fair name i’m doing a homemade water filter and i have no idea what the title should be plz

Awell-diversified portfolio needs about 20-25 stocks from different categories.

Assume the existence of a bankaccount class. define a derived class, savingsaccount that contains two instance variables: the first a double, named interestrate, and the second an integer named interesttype. the value of the interesttype variable can be 1 for simple interest and 2 for compound interest. there is also a constructor that accepts two parameters: a double that is used to initialize the interestrate variable, and a string that you may assume will contain either "simple", or "compound", and which should be used to initialize the interesttype variable appropriately. there should also be a pair of functions getinterestrate and getinteresttype that return the values of the corresponding data members (as double and int respectively).