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Michaela is baking chocolate chip cookies and oatmeal cookies for her Math class. She
conducted a survey to find the number of students who prefer each type of cookie. A total
of 8 students preferred oatmeal cookies and that represents 40% of her class. How many
students preferred chocolate chip cookies?

One expression below in undefined, and the other expression has a well defined value. which expression is undefined and explain why it has no value. which expression is defined? what is the value of that expression and how do you know? what is a different expression using a trig inverse function that is also undefined?

Find the sum of 4x^{2} -4+6 and -7^{2} +3x+1

Apinhole camera is made out of a light-tight box with a piece of film attached to one side and pinhole on the opposite side. the optimum diameter d(in millimeters) of the pinhole can be modeled by d=1.9[ (5.5 x 10^-4) l) ] ^1/2, where l is the length of the camera box (in millimeters). what is the optimum diameter for a pinhole camera if the camera box has a length of 10 centimeters