Evaluate Each Sum That Exists $\sum_{i=1}^{25}(5-4 i)$ (B) $\sum_{i=1}^{6} \frac{3}{4}(2)^{i}$ (C) $\sum_{i=1}^{\infty} 2\left(\frac{3}{4}\right)^{i}$

Short Answer

Evaluate each sum that exists.
(a) $\sum_{i=1}^{25}(5-4 i)$
(b) $\sum_{i=1}^{6} \frac{3}{4}(2)^{i}$
(c) $\sum_{i=1}^{\infty} 2\left(\frac{3}{4}\right)^{i}$
(d) $\sum_{i=1}^{\infty}\left(\frac{4}{3}\right)^{i}$