Please help again I kinda understand but some parts are confusing

Provide an example of a trigonometric function and describe how it is transformed from the standard trigonometric function f(x) = sin x, f(x) = cos x, or f(x) tan x using key features.

The number of fish in a lake can be modeled by the exponential regression equation y=14.08 x 2.08^x where x represents the year

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