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Find the area (in square units) of the triangle formed by the region bounded by the x-axis, the straight line $3x+7y=42$, and the straight line $4x+9y=72$.

In $\triangle ABC$, $AD$ is the bisector of $\angle A$ meeting $BC$ at $D$. If $AB = 30$ cm, $BC = 20$ cm and the length of $BD$ is 4 cm less than $DC$, then the length (in cm) of $AC$ is

In $\Delta XYZ$, length of $XY = 13$ cm. If the length of the median drawn from vertex $Z$ to base $XY$ is $6.5$ cm, then $\Delta XYZ$ is a/an: