Chen uses mental math to find the sum of 326 and 24. she uses 320, 24, and one other number. what is the missing number?

Apublic library wants to place 4 magazines and 9 books on each display shelf. the expression 4s+9s represents the total number of items that will be displayed on s shelves. simplify the expression

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?

10x − 5y + 14 = 0 whats the answer pls