Kal and Kara solve this problem in two different ways.
The perimeter of a rectangle is 46 centimeters.
Its length is 8 centimeters.
What is its width?

Kal's Assignment
2 x 8 + 2w = 46
16 + 2w = 46
16 - 16 + 2w = 46 - 16
2w = 30
w = 15

Kara's Assignment
46 - 2 x 8
46 - 16 = 30
The two widths sum to 30 cm
30 ÷ 2 = 15
The width of the rectangle is 15 cm

Kal's and Kara's methods use _____ operations to simplify the expressions in _____ order.
Kal's method uses _____ , but Kara's method does not.