To three significant figures evaluate ³√0.0072× 81.3 /√23140, using logarithm table.

Answer 1

take the log and you get
1/3 log.0072 + log81.3 - 1/2 log23140 = -.986314
10^-.986314 = 0.10320

Answer 2

log (answer ) = { (1/3) [ log (7.2) - 3] } + log(8.1)+ 1 - (1/2) [ log(2.3140) + 4 ]

answer = 10^log(answer)

Answer 3

i will lime to learn more on how to solve equations