What is | -3 + 9| a. -12 b. 12 c. 6 d. -6

The answer is C, 6. Because -3+9 is 6, and the absolute value of 6 is 6

You see, the |x| symbols mean that whatever negative term inside will be switched to positive. But they are the lowest priority. so first solve -3 + 9 = 6. The absolute value of 6 is 6.

3< x< 5

step-by-step explanation:

|x - 4| < 1

there are two solutions, one positive and one negative.   remember to flip the inequality when taking the negative solution

x-4 < 1       x-4 > -1

add 4 to each side

x-4+4 < 1+4       x-4+4 > -1+4

x< 5                 x> 3

3< x< 5