Answer:
see explanation
Step-by-step explanation:
a + b = x + y + x - y = 2x , then
(a + b)² = (2x)² = 4x² ← as required
240.6 ft is your answer of your question.
c and g
there are 37.2 trillion cells in the human body
Angles in a straight line add up to 180°.
Angles in a triangle add up to 180°.