Limits of sequences and the area under a curve

Use this for “Estimate the area under y = 2x + 1 from 0 to 4 with 8 rectangles, then find it exactly.”

Use this for “Find the limit of (3n + 1) ÷ (2n − 1) as n → ∞” or “of (2n² + 1) ÷ (n² − 3), or say there is none.”