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Pencil Holder. A high school art teacher wanE to buy material for her students' project. The project consists of making a pencil holder in the shape of a right cylinder. The cost of producing the top and bottom of the pencil holder is 48 cents per cm2 and the cost of producing the Side of the cylinder is 25 cents per cmz. Hint: the area of the side is 271175. (a) The cost function is Note: Enter the cost function in terms of the radius r only. The symbol rris in the Calcpad on the right in Symbols. C0) = (b) The dimensions of the pencil holder that has the minimum cost are Note: Enter your answers as fractions or decimal numbers rounded to 4 decimal places without units. h : in Activate Windows The distance (in km) of an airplane departing from Toronto Pearson Airport t seconds into flight is given by the function t). 2 Find the equation of the tangent line to the graph of t) 2 64 + 693t at t = 4