Answer:
The rate of change is 9.5 ft/min
Step-by-step explanation:
every minute the balloon rises in 9.5 feet increments
1. not function
not function
not function (i’m pretty sure)
2. not function
function
Answer:

Step-by-step explanation:
The question is incomplete, as what is required is not stated and the triangle is not given.
So, I will solve generally.
The proof is as follows (see attachment for triangle)
From the attachment, we have:



Make f, e and d the subject



Add up the equations

Collect like terms


We have:

--- angles in a triangle
So, we have:

--- proved
Answer:

Step-by-step explanation:
According to the Parallelogram definition, every Parallelogram have a pair of congruent sides. In this case, Namely
and 
(not listed as an option)
And the opposite angles are congruent too.
So
