Which of the following are necessary when proving that the opposite sides of a parallelogram are congruent? Check all that apply.
A. Opposite sides are parallel.
MB. Opposite sides are perpendicular.
C. Corresponding parts of similar triangles are similar.
D. Corresponding parts of congruent triangles are congruent.

i need the table so i can see

step-by-step explanation:

5=812a+9+3

step 1: simplify both sides of the equation.

5=812a+9+3

5=(812a)+(9+3)(combine like terms)

5=812a+12

5=812a+12

step 2: flip the equation.

812a+12=5

step 3: subtract 12 from both sides.

812a+12−12=5−12

812a=−7

step 4: divide both sides by 812.

812a /812 = -7/812

a= -1/116

so the answer is

a=   -1/116

113.42

i hope that is right.

step-by-step explanation: