How do you draw a triangle that has no right side

What is the number 321,000,000 in scientific notation? also what is the number? ?

Tomas used 3 1/3 cups of flour and now has 1 2/3cups left. which equation can he use to find f, the number of cups of flour he had to begin with? f+3 1/3=1 2/3 f-3 1/3=1 2/3 3 1/3f=1 2/3 f/3 1/3=1 2/3

How is this equation completed? i cannot find any examples in the book.