Q--Are both founders of Ben & Jerry's still involved in the company?
A--My step-by-step reasoning: Ben & Jerry's was founded by Ben Cohen and Jerry Greenfield. The founders sold the company to Unilever in 2000.
So, the answer is no.

Q--Could you brew beer from start to finish in the month of September?
A--My step-by-step reasoning: Brewing a batch of beer takes at least 5 weeks. There are 30 days, or 4 1/2 weeks, in the month of September.
So, the answer is no.

Q--Is a pottery kiln inappropriate for use with glass blowing?
A--My step-by-step reasoning: Pottery kilns heat from the sides. Glass kilns heat from the top. Glass can be fused in a ceramic pottery kiln without trouble.
So, the answer is no.

Q--Would Eminem perform well at the International Mathematical Olympiad?
A--
My step-by-step reasoning: Eminem dropped out of Lincoln High School at age 17 and disliked math and social studies. Mathematics competitions or mathematical olympiads are competitive events where participants sit a mathematics test. The content on the International Mathematical Olympiad ranges from extremely difficult algebra and pre-calculus problems to problems on branches of mathematics not conventionally covered at school and often not at university level either.
So, the answer is no.