What is the rule for reflecting across the y-axis? (x, y)=(x,-y)
(x, y)=(-x, y)
(x, y)=(-x.-Y)
O (x, y)=(x, y)

Which matrix can be multiplied to the left of a vector matrix to get a new vector matrix ?

The base of a triangle exceeds the height by 9 inches. if the area is 180 square inches, find the length of the base and the height of the triangle.

Satchi found a used bookstore that sells pre-owned dvds and cds. dvds cost $9 each, and cds cost $7 each. satchi can spend no more than $45.