Answer:
160000
Step-by-step explanation:
It's just 400 times itself
you understand what is the meaning of an exponent ?
or did you not pay any attention in class ?
an exponent indicates how often the base value has to be multiplied by itself.
e.g.
4⁵ = 4×4×4×4×4
9³ = 9×9×9
therefore,
400² = 400 × 400 = 160,000
