What are the values of a_{1} and r of the geometric series?

Write the converse of the following statement: if the trees have no leaves, then it is fall. if the trees have no leaves, then it is fall. the trees have no leaves, therefore it is fall. it is fall since the trees have no leaves. if it is fall, then the trees have no leaves.

How to find the exponential function y=ca^x, with points (1,2) and (2,1)

Is triangle jkl congruent to triangle rst? if so, what is the scale factor?