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99 points at a zoo, the leopard pen has a ring-shaped sidewalk around it. the outer edge of the sidewalk is a circle with a radius of 12 m. the inner edge of the sidewalk is a circle with a radius of 8 m. (1 point for showing all of your work) a. write and simplify an expression for the exact area of the sidewalk. (1 point for the answer) b. find the approximate area of the sidewalk. use 3.14 to approximate π. (1 point for the answer)

One card is dealt from a 52 card deck. find the probability that the dealt card is a 4 or a black 7

Write an expression that has three terms and simplifies to 4x - 7. identify the coefficient(s) and constant(s) in your expression