What is the equation of the following graph in vertex form?
a) y = ( x - 3 ) 2 - 1
b) y = ( x + 3 )2 - 1
c) y = ( x - 4 ) 2 - 2
d) y = ( x - 4 ) 2 + 8

The base of a triangle exceeds the height by 7 centimeters. if the area is 400 square centimeters, find the length of the base and the height of the triangle.

How is working backward similar to solving an equation?

Last month, a 770 g box of cereal was sold at a grocery store for $3.10. however, this month, the cereal manufacturer launched the same cereal in a 640 g box, which is being sold at $2.50. what is the percent change in the unit price?