The set of all possible values of the independent variable of a function is called the domain.
The set of all possible values of the dependent variable of a function is called the Range .
<u>Note</u>. Two things completely determine a function: the rule and the domain.
Answer:

Step-by-step explanation:
Given

Required
Find the surface area when the length is 
To do this, we simply substitute
for s in the given formula
becomes


Combine Fractions


Simplify Fraction

I’m think the angles are supplementary and you just have to find the value for each angle that is going to equal 180 degrees
M5+M7+81= 180
I’m not really sure just because I didn’t really get to really look at that well this is my guess??