Answer:
Hyun
Step-by-step explanation:
Vika: 1= 15 minutes
Sandy: 1= 10 minutes
Hyun: 1= 7 minutes
18+36=54
i tried to do all of these and none of them add up to 54
Answer:

Step-by-step explanation:
We have:
$log_{10} (10)=1$
$\therefore \log_{10}(2\times 5)=1$
$\implies \log_{10}(2)+ \log_{10}(5)=1$
$\implies \log_{10}(5)=1-\log_{10}(2)$
$\implies \log_{10}(5)=1-0.3010=\boxed{0.6990}$