Which of the following is a counterexample to the following statement? Subtraction of whole numbers is commutative.

A. (4+3) + x = (3+4) + x

b. Ab=bA

C. R+ (s+t) = (r+s) + t

D. N+0=n

Arectangular exercise mat has a perimeter of 36 feet the length of the mat is twich the width writeand solve an equation to determine the length in feet. of the mat then find the area in square feet of the mart

Question b of 10which of the following describe an angle with a vertex at a? check all that applyo a. labcов. савd dooo c_baco d. zacb

In need of in the diagram, ∠abc is a right angle. ∠dbc = 30°27'40". find the measure of ∠abd.