Need help.,.,.,.,.,.,.,

What is the volume of a rectangular prism if the length is 10.4 mm the width is 5 mm in the height is 8 mm

Jack has a piece of red ribbon that is two times as long as his piece of blue ribbon. he says that he can use two different equation to find out how long his piece of red ribbon is compared to his piece of blue ribbon is. is he correct? explain his reasoning

Alicia puts $400 in a bank account. each year the account earns 5% simple interest. how much money will be in her bank account in six months?