Which of the following best defines a function?

a function is a special type of relation for which there is a rule that pairs each input with exactly one output.

a function is a relationship that defines the connection between two variables.

a function is a set of ordered pairs in which no y-value repeats.

a function pairs input and output values with no particular pattern.

A function is a special type of relation for which there is a rule that pairs each input with exactly one output.

Step-by-step explanation:

Functions have input (x) and output (y). For each x value there can only be one y value. :) repeating x values means it isn't a function. its okay to have repeating y values.

We can cancel out the last two for this reason above the second choice is wrong because i say so (=^w^=)

2.2°  

step-by-step explanation:

let θ = the angle of elevation.

tanθ =77/2020

tanθ = 0.038 12

      θ = tan⁻¹0.038 12

      θ = 2.2°