A right hand Riemann sum has been calculated for an increasing function between x=1 and x=2, using n=100.the value for the right hand sum is found to be 3.34 units. Which could be the actual area under the curve.

(B) 3.33

Step-by-step explanation:

The picture below shows a right-sum estimation for an increasing function. As you can see, the right-sum will overestimate the value of the actual area; therefore, the actual area must be slightly lower than the estimated value.

If the estimated value is 3.34, then slightly lower than that is 3.33.

if you was gonna solve for a, a is a   < -12