Which of the following tables show proportion? (Maths) (can be more then 1(most likely more then 1 choice))

If 1/2+2/5s=s-3/4,what is the value of s? a. s=3/4 b. s=25/12 c. s=-25/12 d. s=-3/4

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

What is the best approximation for the area of a circle with a radius of 4 m ? use 3.14 to approximate pi