exam Maths Puzzle Numerical Ability

|3x+2|less than or equal to 4
I under stand these brackets on the expression mean absolute value but what is the absolute value of 3x+2

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exam Other Question

solve each of the following linear equation for variable x, y, and z. you may use any method.

-2x+ 4y - 2z = -14
2x - 5y -4z = -9
2x -1y +3z = 15 If you have a mean equal to 15 and standard deviation equal to 5. Find the probabilities associated with getting:
a. A 15 or above
b. Between a 15 and an 18
c. A 13 and above