(1). write the negation of the statement.

my name is not robert smoker.

(2). write the given common argument form in symbols then use a truth table to prove that it either is or is not a valid argument.

law of contraposition

if x = 1, then the answer is 3.5

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