How many possible combinations of 4 numbers 1-9?

Add the fractions, and simply the result to lowest terms. 2/3 + 2/7= ?

David is spreading mulch on a triangular area of his flower bed. the coordinates of the vertices of the area are (1, 3), (9, 3), and (4, 6). what is the area of the triangle if each square has an area of 3 square feet?

Write a fraction less than 1, which has a denominator of 6 and is greater than 3/4 plz answer !