exam Maths Puzzle Numerical Ability

Hello

Did I solve the below correctly?

|-7.9| = |2.5| =

|7.9 + 2.5| = (-5.4| = 54

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exam Other Question

graph the exponential function f(x)=4^x+2 PL. help with this question realted to sets.
Let A,B & C be sets such that A U B = A U C and A I B = A I C

Show that B = C

(symbols : U - Union , I - Intersectio