book Maths Puzzle Numerical Ability

Could someone help me with this?
A right triangle has legs of lengths 7m and 9m. Which is the best estimate of the length of the hypotenuse? 10m,,11m,12m,13m

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book Other Question

2(4-3x)<4(x-5) HOW CAN I FIND THE EQUATION OF THE LINE PASSING THROUGH THE GIVEN POINTS?
AFTER YOU FIND THE EQUATION OF THE LINE PASSING THROUGH THE GIVEN POINTS HOW DO YOU FIND THE Y-INTERCEPT?