Answer:
Just the second one is correct
X would equal 60 degrees because the degree of the top left area is equal to the degree of the bottom right. So the equation would be x+20=80 so you would solve to get x=60
Answer:

The maximum width must be 
Step-by-step explanation:
Let
L ----> the length of the rectangular pool
W ---> The width of the rectangular pool
we know that

so
----> inequality A
we have

substitute the value of L in the inequality A

simplify



The maximum width must be 
Answer:
Just plug in 10^2-7.5^2
To get 43.75
Step-by-step explanation:
I hope you figure this out.
Answer:
simplified: 3x^2+7x+5y-4
Step-by-step explanation:
all you gotta do is you add -5x and 12x