(1) (10 points) this question is about working with abstract class in java program. create two classes (a and b) with a has an abstract method ( void call ( )) and b extends from a. class a has a concrete method calla ( ) that displays ""concrete method calla() in a"". b is a concrete class. your abstractdemo program should display the following:

In outlook how can cherie look at the details of an event that appears on the month view of her calendar? check all that apply. by switching to the detail view by switching to the week view by switching to the day view by right-clicking on the event by double-clicking on the event by highlighting the event

2pointswho was mikhail gorbachev? oa. a russian leader who opposed a coupob. a polish leader who founded the labor union "solidarityoc. a soviet leader who called for a closer relationship with the unitedstates, economic reform, and a more open societyd. a soviet leader who called for more oppression in the soviet union

Write a grading program for a class with the following grading policies: a. there are two quizzes, each graded on the basis of 10 points. b. there is one midterm exam and one final exam, each graded on the basis of 100 points. c. the final exam counts for 50% of the grade, the midterm counts for 25%, and the two quizzes together count for a total of 25%. (do not forget to normalize the quiz scores. they should be converted to a percentage before they are averaged in.) any grade of 90 or more is an a, any grade of 80 or more (but less than 90) is a b, any grade of 70 or more (but less than 80) is a c, any grade of 60 or more (but less than 70) is a d, and any grade below 60 is an f. the program will read in the student’s scores and output the student’s record, which consists of two quiz and two exam scores as well as the student’s average numeric score for the entire course and final letter grade. define and use a structure for the student reco