If log 27 is 1.436,then what is log 9

log 27 = log 3^3

= 3 log 3   (Using a law of logs)

3 log 3 = 1.436

so log 3 = 1.436 / 3 = 0.47867

log 9 = log 3 ^2

= 2 log 3

= 2 * 0.47867 =  0.9573  (correct to the nearest 10 thousandth).

-  log 9 = 0.9573

$20.30

Step-by-step explanation:

First we must find Mary's total.

3kg × $9.90/kg = $29.70

She gave the cashier $50. So we subtract the total from that to determine the amount of cash or change she should get back.

$50 - $29.70 = $20.30