**What is the common ratio $r$ of the exponential function $h(x)=-\dfrac{16}{81}\cdot\left(\dfrac{3}{2}\right)^x\ $**? $r=$ [[☃ numeric-input 1]] **What is the value of $h(x)$ when $x= 4\ $**? $h(4)=$ [[☃ numeric-input 2]]