Plug in: \( S_15 = rac152(2(7) + 14 \cdot 4) = rac152(14 + 56) = rac152(70) = 15 \cdot 35 = 525 \). - AMAZONAWS

📅 March 6, 2026 👤 scraface

Mar 06, 2026

$Plug in: \( S_{15} = rac{15}{2}(2(7) + 14 \cdot 4) = rac{15}{2}(14 + 56) = rac{15}{2}(70) = 15 \cdot 35 = 525 \).$