In triangle ABC (not a right triangle), altitude CD
is drawn to side AB
. The length of AB
is c
. Which of the following statements must be true?

Asap 25 pts + brainliest to right/best answer

What is the multiple zero and multiplicity of f(x) = (x ? 3)(x ? 3)(x + 5)? multiple zero is 3; multiplicity is 2 multiple zero is 5; multiplicity is 1 multiple zero is ? 5; multiplicity is 1 multiple zero is ? 3; multiplicity is 2

Determine the difference: 3.2 × 1010 – 1.1 × 1010. write your answer in scientific notation.