Answer:
x^2-16
Step-by-step explanation:
A= (b)(h)
A= (x+4)(x-4)
x^2-4^2
x^2-16
Answer:
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Step-by-step explanation: sorry lol
10% of 50kg is 5kg
50kg add 5kg is 55kg
=55kg
The answer is 80, 2x+3x+4x=180, so x=20. 20*4=80.