Answer:
Area is (x² - 9) units squared.
Step-by-step explanation:
• from difference of squares quadratic property:

→ a is x
→ b is 3
• Therefore:

Answer:
See below, please.
Step-by-step explanation:

Hence, the number is 60.
For the first one a=4 cuz 4x4=16
Answer:
<h2><u>440 ft.²</u></h2>
Step-by-step explanation:
Surface area of the object = 2 (lw + wh + hl) = 2 (10× 6 + 6 × 10 + 10 × 10)
= 2 ( 60 + 60 + 100) = 2 × 220 = 440 ft.²
Yes your answer is correct