Giving free brainiest yes but the only thing you need to do is give me a brainiest

F(x) = x2 − 9, and g(x) = x − 3 f(x) = x2 − 4x + 3, and g(x) = x − 3 f(x) = x2 + 4x − 5, and g(x) = x − 1 f(x) = x2 − 16, and g(x) = x − 4 h(x) = x + 5 arrowright h(x) = x + 3 arrowright h(x) = x + 4 arrowright h(x) = x − 1 arrowright

Christina can paint 420 square feet in 105 minutes. which unit rate describes the scenario?

What is the simplified form of (3.25x10^3)(7.8x10^6) written in scientific notation?