Answer:
Explanation:
AI-generated answer
To find the value of "a" when the arithmetic mean (AM) of a, a + 3, a + 6, a + 9, and a + 12 is 10, we can set up the equation:
(a + a + 3 + a + 6 + a + 9 + a + 12) / 5 = 10
Combine like terms and simplify the equation:
(5a + 30) / 5 = 10
Divide both sides of the equation by 5:
5a + 30 = 50
Subtract 30 from both sides of the equation:
5a = 20
Divide both sides of the equation by 5:
a = 4
Therefore, the value of "a" is 4.