book Maths Puzzle Numerical Ability

4 with an exponent of 1.7

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book Other Question

Solve the quadratic equation by factoring and applying the property "ab=0 if and only if a=0 or b=0"

(x^2)+3kx-(10k^2)=0 The sum of the ages of a husband and wife is 98 years. He is twice as old as she was when he was the age she is today. What are their ages?