12 7/10 + 6 5/10 as a mixed number in the simplest form

Suppose that x and y are both differentiable functions of t and are related by the given equation. use implicit differentiation with respect to t to determine startfraction dy over dt endfraction in terms of x, y, and startfraction dx over dt endfraction .

Witch represents the inverse of the function f(x)=1/4x-12

X-10/4 when x = –18 a 7 b –2 c –7 d 2