Find the value of X. Show your work

What number should be added to both sides of the equation to complete this square? x^2-10x=7

Alonso walked with his friend andy one day, and wanted to compare their speeds. alonso walked 3 miles in one hour, and andy walked 2 miles in 2 hours. complete the table to graph the relationship for each person.

In a class, there are 12 girls. if the ratio of boys to girls is 5: 4 how many boys are there in the class