Question

What is the exact value of x?

Answer 1

B

Explanation:

`5\cdot 21^(5x) = 16 \\\ 21^(5x) = (16)/(5) \\\\ 21^(5x) = 3.2 \\\ log 21^(5x) = log 3.2 \\\ 5x\cdot log 21 = log 3.2 \\\ 5x = (log 3.2)/(log 21) \\\\\ x = (log 3.2)/(5\cdot log 21)`

I hope I helped you.