Hi there! 
Your question: 
Sales fall from 300 per week to 270 per week what's the percentage change?
My answer:
The formula for calculating percent change is as follows: 
[(y2 - y1)/y1]*100=your percent change 
y2= first value 
y1=second value 
Plug the numbers in: 
[(300-270)/300]*100
[30/300]*100
0.1*100
10 
Therefore, the percent change is 10%
Hope this helps! Let me know if it's incorrect so I can fix it:)
        
             
        
        
        
From the given information we can write the equation:
-16t^2 +96t + 4 = 112
-16t^2 + 96t + 4 - 112 = 0
-16t^2 + 96t - 108 = 0
simplify, change the signs, divide by -4
4t^2 - 24t + 27 = 0
You can use the qudratic formula but this will factor to
(2t-3)(2t-9) = 0
Two solutions
t = 3/2
t = 1.5 seconds at 112 ft on the way up
and
t = 9/2
t = 4.5 seconds at 112 ft on the way back down
Graphically, (green line is 112 ft)
 
        
             
        
        
        
Answer:
Triangle 1 -     (if they want simplest radical form) or 5.4 (if they want to the nearest tenth)
 (if they want simplest radical form) or 5.4 (if they want to the nearest tenth)
Triangle 2-    i couldnt figure this one out- may not be true
Pythagorean Theorem is...   C) true for all right triangles 
Step-by-step explanation:
 
        
             
        
        
        
Part one is 11 1/8.
part two is 4 7/40.