Amarina is in the shape of a coordinate grid. boat a is docked at (3.1, −1) and boat b is docked at (−4.1, −1). the boats are units apart. a: 5.1 b: 7.2 c: 8.1 d: 8.2

B: 7.2

Step be step explanation:

We are told that a marina is in the shape of a coordinate grid. Boat A is docked at (3.1, −1) and Boat B is docked at (−4.1, −1).

To find difference of units between two boats we will use distance formula.

Upon substituting our given values in distance formula we will get,

Therefore, the boats are 7.2 units apart and option B is the correct choice.  

h is the x-coordinate of the vertex

step-by-step explanation:

we have

in this function

the point represent the vertex of the function

so

h is the x-coordinate of the vertex

k is the y-coordinate of the vertex