Which diagram is not a function please a need explanation

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 .

Which is the graph of the function y=2(4)^x

In order to be invited to tutoring or extension activities a students performance 20 point higher or lower than average for the