What does it mean for an equation to express y in terms of x?

What is the maximum total area that 450cm of string can enclose if it is used to form perimeters of two adjoining rectangles as shown?

Plzzz i beg u so much asaaaap ! what is the slope of this line? enter your answer in the box.

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?