Which represents a linear function? a. Y=2x b. 2x^2 c. Y=1/x

Can somebody 1. what is the formula for finding the vertical distance between two points on a coordinate plane?

If mary had 320 toy cars and she gave her friend 50 cars and then she gave her brother 72 more cars how much toy cars would mary have left ● explain with proper details

Consider the sequence below. 3 , 1 , 1/3 , 1/9 , select the explicit function which defines the sequence.