If A ∆ B = A × (A + 2B) = A² + 2AB, then
• 1 ∆ B = 1 + 2B
• 4 ∆ (1 ∆ B) = 4 ∆ (1 + 2B) = 24 + 16B
• 2 ∆ (4 ∆ (1 ∆ B)) = 2 ∆ (24 + 16B) = 100 + 64B
Someone help me please
In 2006, 86% of U.S. households had cable TV. Choose 3 households at
random. Find the probability that
How long does it take the Moon to make one revolution around Earth? about 365 days
about 29 days
about 7 days
about 24 hours