What number goes in the blank?? NEED HELP ASAPPP

Given the equation f(x)=a(b)x where the initial value is 40 and the growth rate is 20% what is f(4)

What are the solutions of the system? solve by graphing. y = x^2 + 3x + 2 y = 2x + 2

1c) the number 131 is a term in the sequence defined by the explicit rule f(n)=5n-4. which term in the sequence is 131? 2a) write the first four terms of the function f(n)=n^2-1 2b) what is the 10th term of the sequence defined by the explicit rule f(n)=n^2-1 2c) the number 224 is a term in the sequence defined by the explicit rule f(n)=n^2-1. which term in the sequence is 224?