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16.5 cm

Step-by-step explanation:

Using Pythagoras' identity in the right triangle

The square on the hypotenuse is equal to the sum of the squares on the other 2 sides.

let x be the other leg, then

x² + 13² = 21²

x² + 169 = 441 ( subtract 169 from both sides )

x² = 272 ( take the square root of both sides )

x = ≈ 16.5 cm ( to the nearest tenth )

46 dollars is the answer.

step-by-step explanation:

6*6 = 36,         36+10=46