There is a rule:
One input(x-value) can only have one output(y-value) in order to be a function.
If one input has more than one output, it is not a function.
(This doesn't apply to outputs, one output can have more than one input and still be a function)
The 1st option is not a function because the inputs 9 and 10 have more than one output.
The 2nd option is not a function because the input 3 has more than one output.
The 3rd option is a function because each input only has one output.
The 4th option is not a function because the input 5 has more than one output.
Answer:
The monument is standing at a distance of 834.322 feet
Step-by-step explanation:
Given
Height of the Jefferson Davis Monument in Fairview = 351 feet
Pedro while looking at the top of the monument makes an angle with the horizontal surface = 75 degrees
As we know tan θ = Perpendicular / Base
Substituting the given values in above equation, we get -
tan 75 = 351/Base
Base = 351/tan 75
Base = 834. 322 feet
No her answer is not reasonable because 1.2 * 2.6 = 3.12 and 31.1 is no where near 3.12