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## Answers

6.9=√(6)(9)[(6+9)²-c²]/15 -----> move the 15 to the left side

6.9(15)=√(6)(9)[(6+9)²-c²]

103.5=√54(15²-c²)

103.5=√54(225-c²)

103.5=√12150-54c² -----> make the square root as the index of the number in the left side which is 103.5.

103.5²=12150-54c²

10712.25=12150-54c²

54c²=12150-10712.25

54c²=1437.75 ----> divide both sides by 54

c²=26.625

c=√26.625

c=5.16

The answer is 5.16.