Justin gave the clerk $20 to pay a bill of $6.57 how much change should justin get?

Given that Justin gave the clerk $20 to pay a bill of $6.57.

Now we have to find how much change should justin get.

Justin will recieve change only if he paid more money that the bill amount.

Clearly $20 (paid money) is more than $6.57 (bill amount)

Hence Justin will recieve difference of both values.

To find the difference, we subtract 6.57 from 20

20-6.57= 13.43

Hence Justin will get change of $13.43

1,407.5 hours

step-by-step explanation:

we first convert all the time to hours and then sum them up.

there are 24 hours in 1 day, in 58 days, there are 24 x 58 = 1,392 hours.

there are 60 minutes in 1 hour, thus, 30 minutes will be equivalent to 30 / 60 = 0.5 hours.

therefore, the number of hours it will take mercury to complete a full rotation is 1,392 + 15 + 0.5 = 1,407.5 hours

the answer would be 0.54