7 meter = 0.007 km they are equal
1 meter = 0.001 km
1 km = 1000 m
((x ^ (1/4)) * (y ^ 16)) ^ (1/2)
What we must do in this case is to use the properties of the exponents:
We have then:
((x ^ (1/4)) * (y ^ 16)) ^ (1/2)
((x ^ (1/8)) * (y ^ 8))
answer:
((x ^ (1/8)) * (y ^ 8))
option number 2