What is the perimeter of a square with sides 2.5 mm long? A 7.5 mm
B 10 mm
C 2.5 mm
D 5 mm

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

Which one ? is the answer and how to find this answer

If you can solve all of these i will give ! - 4% of 190 - 4% of 162.5 - 4% of 140 - a 4% increase from 155.1 - a 4% increase from 159.8