If a=1/x-1/y, what is the value of 1/a?

In the triangles, bc =de and ac fe. if the mzc is greater than the mze, then ab isdfelth

Which statement is true about the extreme value of the given quadratic equation? a. the equation has a maximum value with a y-coordinate of -21. b. the equation has a maximum value with a y-coordinate of -27. c. the equation has a minimum value with a y-coordinate of -21. d. the equation has a minimum value with a y-coordinate of -27.

F(x)=3(1.54)^x whats this how do you do it