I can only assume that you meant, "Solve for x:"
Apply the exponent 3/2 to both sides of this equation. The result will be
3/2
343 = x/6.
Multiplying both sides by 6 isolates x:
3/2
6*343 = x Since 7^3 = 343, the expression for x
can be rewritten as
3/2
6*(7^3) = x which can be further simplified, as follows:
x = 6^(3/2)*7^(9/2), or:
x = 6^(3/2)*7^(8/2)*√7, or
x = 6^(3/2)*7^4*√7
I would suggest you to use quickmath it helps a lot.
Answer:
Option B is the correct answer.
Step-by-step explanation:

Here
is a rational number and
is an irrational number whose sum gives irrational number.
39/10
And/or
3 9/10
And/Or
3.9