exam Maths Puzzle Numerical Ability

a box of apples weighs 42 pounds, plus or minus 1/2 pound. write an absolute value inequality expressing this fact. let w equal the weight of a box of apples.

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This problem is very similar to one on my homework project. Can you please help explain how to work this problem properly.

(2√3a - √b)( √3a + 3√b)

Her
This is from a text book
base 1 of a trapezoid =10 ft,base 2=8ft.The height is 5.What is the area?

Thank You alot for your help!!!