Use a Riemann Sum to Approximate the Area Under the Graph

Multiple Choice

Use a Riemann sum to approximate the area under the graph of f(x) on the given interval. Use the left endpoints. f(x) = 3x - 4; 1 ≤ x ≤ 4, n = 6

A) $\frac { 51 } { 4 }$ = 12.75
B) $\frac { 63 } { 4 }$ = 15.75
C) $\frac { 33 } { 4 }$ = 8.25
D) $\frac { 87 } { 4 }$ = 21.75