Question

Question 1.1. State a conjunction or disjunction equivalent to the open sentence |a – 9| ≤ 4.
a – 9 ≥ 4 and a – 9 ≤ –4
a – 9 ≤ 4 or a – 9 ≥ –4
a – 9 ≤ 4 and a – 9 ≤ –4
a – 9 ≤ 4 and a – 9 ≥ –4

Answer 1

| x | < = a has the solution -a <= x <= a

Answer 2

?

Answer 3

that is a general form for the solution

Answer 4

plug in a-9 for x

Answer 5

In general
| x | < = k, where k>0, has the solution -k <= x <= k

Answer 6

| a - 9 | <= 4
is equivalent to
-4 <= a - 9 <= 4