viết chương trình nhập hai số a, b in ra màn hình tổng, hiệu, tích, thương, tổng bình phương hai số, hiệu bình phương hai số

What is the primary difference between the header section of a document and the body? a. the body is displayed on the webpage and the header is not. b. the header is displayed on the webpage and the body is not. c. the tag for the body is self-closing, but the tags for the headers must be closed. d. the tag for the header is self closing, but the tag for the body must be closed.

The graph shows the number of chapters sarah read in a book each day of a week

What is data validation? (in a simple definition)