Please help (30 points)

Provide the missing statements and reasons for the following proof.

1. during first 10 seconds 2. between 10 seconds and 35 seconds 3. during 35 seconds to 40 seconds

In a school 2/3 of the students study a language of those who study a language 2/5 study french

An appliance store sells a washer-dryer combination for $1800. if the washer costs $300 more than the dryer, find the cost for each appliance.