Answer:
Choice D
Step-by-step explanation:
If you check each one plugging in your info into this you can get 
that 12² + 16² will equal 400 which is the same as 20².
Answer:
B.
Step-by-step explanation:
The function is positive when it is above the x-axis
The following x values are where the function has positive y coordinates:
(-2,0)
(4,inf)
The function is negative when it is below the x-axis
The following x values are where the function has negative y coordinates:
(-inf,-2)
(0,4)
So you should see all of these intervals listed in choice B
(7,3)
Step-by-step explanation:
X= -2+3y
....
-2+3y-3y=-2
-2+3y+3y=16
.......
6y=18
...
y=3
x=7
75/60 is 1.25 and 1.25 times 6 is 7.5 but you can't produce a half widget so it is just 7
