The answer is 81 because 27 x 3
Answer:
4 hours
Step-by-step explanation:
Please see attached picture for full solution.
Answer:
D
Step-by-step explanation:
a² - b² ← is a difference of squares and is factored in general as
(a + b)(a - b)
42² - 38² ← is a difference of squares and factors as
42² - 38² = (42 + 38)(42 - 38) = 80(4) = 320 → D