Use the diagram to the right to solve for y. A y = 13
B
y = 15
C. y = 7.5
D
y = 20

Determine whether the set of whole numbers is closed under addition. explain why the set is or is not closed. give an example.

Graph the equation by plotting point x=2

Thales was an ancient philosopher familiar with similar triangles. one story about him says that he found the height of a pyramid by measuring its shadow and his own shadow at the same time. if the person is 5-ft tall, what is the height of the pyramid in the drawing?