Which of the following is a negative effect of the rise in agricultural technology following World War II? increased crop yields
environmental degradation
need for more agricultural land
need for more farm workers

Idon understand these and need some ! ?

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).

What does 21 pilots middle aged name as a band 15 years prior to them naming their band 21 pilots?