HELP WORTH 50 POINTS AND ILL GIVE YOU BRAINLESS IF ITS RIGHT Evaluate. Express your answer in scientific notation.
2.9 x 10^-6 + 9.3 x 10^-6

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

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

Given a: b and b: c, find a: b: c. write the ratio in simplest form. a: b=6: 10 and b: c=21: 33