sat suite question viewer
For the exponential function , the table shows four values of and their corresponding values of . Which equation defines ?
Explanation
Choice D is correct. It's given that function is exponential. Therefore, an equation defining can be written in the form , where and are constants. The table shows that when , . Substituting for and for in the equation yields , which is equivalent to . Substituting for in the equation yields . The table also shows that when , . Substituting for and for in the equation yields , which is equivalent to . Substituting for in the equation yields .
Choice A is incorrect. For this function, is equal to , not .
Choice B is incorrect. For this function, is equal to , not .
Choice C is incorrect. For this function, is equal to , not .