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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 neccesary.
Consider the given interval and the number of rectangles. Calculate the width of each rectangle and identify the left endpoints of each subinterval. Evaluate the function at these points to get the heights of the rectangles. Remember, the area of a rectangle is width times height.
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
`9.75`