Mr. mustard said eight less than three times my age is 100, what's his age ?

He is 36 years old. 3x-8=100. Add 8 to both sides and you get 3x=108. Divide both sides by 3, and you get x=36. He is 36 years old. 

Mr.mustard is 36 years old

What is the last question i don’t see it?

Answer: the correct answer is 10step-by-step explanation: let the number be n, then the expression becomes,then“twelve more than the quotient of a number and two, decreased by four” iswhen n=4,we substitute 4 whetever we see n to get,we simplify to obtain,we further simplify to get,therefore the correct answer is c.