Write a Dart program using variables to display your name, age, school, and a hobby. Print it in one logical sentence.

Write a Dart program that performs two mathematical operations using functions.

Write a Dart program to determine the grade based on a student's marks. The program should print out the appropriate grade according to the following criteria:

• If the marks are greater than 85, print "Excellent".
• If the marks are between 75 and 85 (inclusive), print "Very Good".
• If the marks are between 65 and 75 (inclusive), print "Good".
• If the marks are below 65, print "Average".