Answer:
Step-by-step explanation:

Volume is just length x width x height. 5 x 6 x 7 is 210. 210cm
Answer:
5cm^3
Step-by-step explanation: please let me know if that wrong.
Answer: n⁴+10n²x+25x²
Step-by-step explanation:
I don;t know how I can use the binomial squares pattern on Brainly, but I can definitely guide you through the problem.
(n²+5x)² [rewrite this from the squared]
(n²+5x)(n²+5x) [use FOIL to expand]
n⁴+5n²x+5n²x+25x² [combine like terms]
n⁴+10n²x+25x²