Can someone please answer the most recent question here's some points

Identify the initial amount a and the growth factor b in the exponential function. a(x)=680*4.3^x

Talia grouped the terms and factored out the gcf of the groups of the polynomial 15x2 – 3x – 20x + 4. her work is shown below. (15x2 – 3x) + (–20x + 4) 3x(5x – 1) + 4(–5x + 1) talia noticed that she does not have a common factor. what should she do?

What is the sum of 25x + 15y and (-18x - 6y)