Any math experts can help me with these please and thanks

5.(04.07) two different plants grow each year at different rates, which are represented by the functions f(x) = 4* and g(x) = 5x + 2. what is the first year the f(x) height is greater than the g(x) height? year 3 year 0 year 2 year 1

What is the y intercept of f(x)=(1/2)^x?

When you answer this can you explain