Anyone help me with this?

Aline of best fit is drawn for the set of points shown on the graph. which point is an approximate extrapolation for x = 30 from the line of best fit?

What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angle measure.

The graph of f(x), shown below, resembles the graph of g(x) = x2, but it has been changed somewhat. which of the following could be the equation of f(x)?