20×(5×(-16) ) = (20×5)×(-16)

 Associative Property of Multiplication

Step-by-step explanation:

When parenthesis change partners, it is Associative Property.

The operation is multiplication

NOTE: If 20 had moved from the left side of (5 x -16) to its right side, it would have been Commutative Property.

c. y = 1/4 x + 5

step-by-step explanation:

first, put the equation of the line on the graph into slope-intercept form

(y = mx + b):   y = -4x + 8

second, a perpendicular line has to have "an opposite/reciprocal slope" to the original slope. so, find the "m" value in your original equation (it's -4, right? )

original slope: m = -4   perpendicular slope: change the sign to its opposite and find the reciprocal ("flip" the number)

new slope is now positive (b/c the original slope was negative 4), and it's 1/4 (not the original slope of 4 or 4/1)