Please help will give lots of points and mark brainless

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 .

Twice the sum of a number and 4 is equal to three times the difference of the number and 7. find the number.

Which of the following is the explicit rule for a geometric sequence defined a recursive formula of a -5a for which the first term is 23?