Rewrite the expression by using grouping symbols. y • 4 + y • z
a.4(y + z) b. y • (4 + y) • z c. z(y • 4) d. y (4 + z)

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?

Find the value of x for which line a is parallel to line b

5. write an equation for the line that is parallel to the given line and that passes through the given point. y = –5x + 3; (–6, 3)