Final answer:
The figurative language for 'Matthew is a regular Einstein' is a metaphor, while 'biting the hand that feeds you' is an idiom, each expressing different ideas beyond their literal meanings.
Step-by-step explanation:
The expression 'Matthew is a regular Einstein' when it comes to mathematics and calculations is an example of a metaphor. This figure of speech makes a direct comparison between Matthew's mathematical abilities and the intelligence of the renowned physicist Albert Einstein, suggesting that Matthew is exceptionally smart in that field.
In the second instance, the phrase 'biting the hand that feeds you' is an idiom. This figurative language implies that leaving a company after they have invested in your training is an act of ingratitude or self-sabotage — much like literally biting the hand of someone who is feeding you.