Financial Maths, 2ADV M1 EQ-Bank 12 Evaluate \(\displaystyle \sum_{r=4}^7\left(2^r+3 r\right)\). (2 marks) --- 4 WORK AREA LINES (style=lined) --- Show Answers Only \(306\) Show Worked Solution \(\displaystyle \sum_{r=4}^7\) \(=2^4+12+2^5+15+2^6+18+2^7+21\) \(=306\)