book Maths Puzzle Numerical Ability

How do i approximat the best fitting line by sketching a scatter plot, sketching the line, locating two points on the line, or by finding the equation of a line?

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A box is being pulled by means of two ropes. One rope exerts 100 pounds of force at 28degrees above the horizontal. The other rope exerts 58 pounds of force at 23degrees below the Tom is 8. His mom is 31. How long before she is twice his age?