HELP ME PLEASE

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

If a || b and e || f , what if the value of y ?

If private savings 'v' = 0.75s and total savings 's' equals $4.20 billion, solve for public and private savings.