I'm pretty sure it's the Associative Property.
Let: hypotenuse = a , known leg = b , unknown leg = c
According to Pythagoras' Theorem:

c =

c = 3.74 inches
∴ the length of the hypotenuse to 1d.p. ≈ 3.74 inches
Answer:

Step-by-step explanation:
If the graph of the function
represents the transformations made to the graph of
then, by definition:
If
the graph is stretched horizontally by a factor 
If
the graph is compressed horizontally by a factor 
In this problem we have the parent function
And we know that it stretches horizontally by a factor of 4
Therefore
and 
The transformation is:
And the function is:

1. c i think. 2. its b i think 3.a thats all i know im sorry