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not understanding these problems. In the next 4 problems, only use point-slope form for the tangent line, not slope-intercept form. Also graph f(x) and the tangent line equation, both to double-check and to help build understanding. The prompt is: Approximate the equation of the tangent line to the graph of fat x=a by numerically approximationg f '(a), using h=0.1 When the book says "at x=-2" or something like that in these problems, you should think of it as "at a=-2" instead, or at "c=-2"; our textbook author seems to switch between "a" and "c" for named locations on the horizontal axis. #23 f(x) = x^2 + 2x + 1, x=3 (but think of it as at a=3) #24 f(x) = 10/(x+1), x=9 (but think of it as at a=9) #25 f(x) = e^x, x=2 (but think of it as at a=2) #26 f[x) = cos(x), x=0 (but think of it as at a=0)