book Maths Puzzle Numerical Ability

Tom is 8. His mom is 31. How long before she is twice his age?

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book Other Question

Compute the value of the discriminant and give the number of real solutions to the quadratic equation.

-5x^2 -2x+3=0

Please help!!!!!!! and Thank You!!!!!! Ken Griffey, Jr., is listed as being 6 ft. 3 inches tall and weighing 205 pounds. What is his BMI to the nearest 10th?

BMI = (weightinpunds)/(heightinches)^2