is an altitude of ABD. What is the length of ? If necessary, round your answer to two decimal places.?

Question

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ac =16

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bc =30

angle c is 90 degrees

Answer 1

I'm just guessing (because your question is so poorly worded), but I think you're looking for the length of AC (the hypotenuse) of the triangle. If so, you have to use Pythagorean Theorem
c = √(a² + b²) which, in your problem, is
c = √(16² + 30²) = 34

Doug

Answer 2

Your first sentence is wrong. You are mixing A,B, and C with a, b, and c. Do you mean AC = 16, and BC is 30? Use the right letters. A is not a. B is not b. C is not c.