Which of the following are equations? Check all that are true.

b + 5

1/3 + x

3x + 2y = 30

x − 2

z = 14

Anyone know? will mark brainliest if correct!

In the diagram, ab is tangent to c, ab = 4 inches, and ad = 2 inches. find the radius of the circle.

A6 ounce bottle of dressing costs $1.56 a 14 ounce bottle costs $3.36 a 20 ounce bottle costs $5.60 which has the lowest cost per ounce