The common ratio of a geometric series is \dfrac14
4
1

start fraction, 1, divided by, 4, end fraction and the sum of the first 4 terms is 170

The first term is 128

Step-by-step explanation:

The common ratio of the geometric series is given as:

The sum of the first 4 term is 170.

The sum of first n terms of a geometric sequence is given b;

We put the common ratio, n=4 and equate to 170.

Simplify:

ca = ec

cpctc makes it so that corresponding parts of the triangle you proved to be equal are equal, the other options aren't part of the part of the triangles you proved to be equal.

answer: the answer is 110