Iknow it's either c or d, because i know the equation, but what do i do from there?

Aparallelogram has two side lengths of 5 units. three of its sides have equations y = 0, y = 2, y = 2x. find the equation of the fourth side.

Which conjunction is disjunction is equivalent to the given absolute value inequality? |x+2|< 18

Marla bought a book for $12.95, a binder for $3.49, and a backpack for $44.99. the sales tax rate is 6%. find the amount of tax and the total she paid for these items