Answer: 9a^4 - b^2
= (3a^2)^2 - b^2
= (3a^2 + b)(3a^2 - b) using a^2 - b^2 = (a+b)(a-b)
hope it helps.
Answer:
349.5
Step-by-step explanation:
y=4x+10
2y-8x-20=0
2y-8x=0+20
2y-8x=20
2y=8x+20
Hope this will help!!:)
28-21=7
thickness = 2x7=14
20 days
