book Maths Puzzle Numerical Ability

Linear and Quadratic functions???
f:x-x+1

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book Other Question

if, log2=a and log3=b, express log cuberoot972 in terms of a and b. the answer is 2a+5b over 3. please help. Chaundra is two years older then her brother. She is four years younger then her older sister. Her two parents are each forty-one. The total of all five ages is one hundred twenty-three. How old is Chaundra?