Mark bought a book for $21.62. if he paid with two 20 bills what was his change

$18.38

Explanation:

Mark has two $20 bills.

Add 20 and 20, or multiply 20 by 2.

20+20=40, or 20•2=40.

This means that he started with $40 dollars in total.

Then, Mark spent $21.62 out of the $40 that he had.

Now all we have to do is subtract $40.00 and $21.62.

40.00 - 21.62 = 18.38.

Another way to get your answer is to take $21.62 and cancel out the first $20 bill out of that so you're left with $1.62.

Then you can subtract the second $20.00 that Mark had by $1.62.

20.00 - 1.62 = 18.38.

In conclusion, Mark is left with $18.38.

your answer would be (b)

what was the significance of the plessy vs ferguson ruling and jim crow laws

answer the impact. plessy v. ferguson allowed 'separate but equal, also known as segregation, to become law in the united states