book Maths Puzzle Numerical Ability

Can someone please help me with thtese questions. I need your help bad.

Solve each absolute value equation

16. |3 - x| =

30. 3 - | x - 4| = 2

Solve each absolute

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book Other Question

A student has earned scores of 87, 81, and 88 on the first 3 of 4 tests. If the student wants an average (arithmetic mean) of exactly 87, what score must she earn on the fourth test? Find the midpoint of the line segment from A(2-,9) to B(4,5).