It’s a because the total of x and y is 6.80 and the second equation is how much each are and the total being 7.
Brainliest?
24 is 2% of 120. It’s not that hard

Actually Welcome to the Concept of the areas,
Area of a rectangle = length * width.
hence, l = 11 and w = 4
hence, 4*11 = 44 square units.
Area = 44 sq. units
A triangular prism which has 5 faces (two triangle and three rectangle)