Question

∑[i=4,8,(ix-3)=76]

Answer 1

\[\sum_{i=4}^{8} i x - 3 = 76\]
\[\rightarrow x \sum_{i=4}^{8} i - \sum_{i=4}^{8}3 = 76\]
\[30 x - 15 = 76\]
\[x = \frac{91}{30} \approx 3.033\]