We have to use Pythagorean theorem that says :

The missing length of the triangle is : 36 feet
Answer: 3 - 2x
I’m not sure if you meant xxx or not.
Answer:
9
Step-by-step explanation:
perfect square sholud be 
so (w+3)*(w+3) is perfect square and extention of it is =>w*w+6w+9
Answer:
52 62 72 82 92 102 112 120 121 122 123 124 125 126 127 128 129 132 142
there are 19.
Step-by-step explanation: