Question

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Answer 1

hi the absolute value means a number without its sign are cool with that?

Answer 2

(19.88+20.12)/2 = 20

19.88 ≤ w ≤ 20.12
19.88-20 ≤ w-20 ≤ 20.12 - 20
-0.12 ≤ w-20 ≤ 0.12

|w - 20| ≤ 0.12

Answer 3

thank you !!...what about the first one ?

Answer 4

+6(6-4x)=8x+4..........36-24x=8x+4..........take the variable to the left and constant to the right u'll get.....-24x-8x=4-36.......-32x=-32 divide both sides by -32.........x=1..................... and -6(6-4x)=8x+4...............-36+24x=8x+4.......24x-8x=4+36...........16x=40 divede both sides by 16..............x=5/2