Answer:
12, 14 , - 4
Explanation:
f(5) is in the interval x ≤ 7 , so f(x) = x + 7 , then
f(5) = 5 + 7 = 12
f(7) is in the interval x ≤ 7 , so f(x) = x + 7 , then
f(7) = 7 + 7 = 14
f(10) is in the interval x > 7 , so f(x) = 6 - x , then
f(10) = 6 - 10 = - 4