3) Cole has answered 18 emails. This is 30% of emails he must answer. How many
emails does he need to answer?

He needs to answer 6 mails.

Step-by-step explanation:

Given,

The number of mails = 18

Among them, he needs to answer 30% of mail.

To find the number of mails he needs to answer.

Formula

Of represents multiplication

Now,

The number of mails he needs to answer = 30% of 18

= 30% × 18

= × 18

= 5.4

So,

He needs to answer 6 mails.

it would be 6xy and -16xy.