Approximate the area between the `x`-axis and the graph of `f(x)=x^2 + 4` over the interval `[0,2]` using a left-hand estimate with 4 rectangles.

Area `\approx`  

Round to two decimal places if necessary.

Box 1: Enter your answer as a number (like 5, -3, 2.2172) or as a calculation (like 5/3, 2^3, 5+4)
Enter DNE for Does Not Exist, oo for Infinity