Dan's new cell phone cost $549, but its value is expected to decrease by 30% each year. You can use a function to approximate the value of Dan's cell phone x years after he bought it. Write an equation for the function. If it is linear, write it in the form h(x)=mx+b. If it is exponential, write it in the form h(x)=a(b)ˣ.
h(x)= [_____]
