Binomial probability distributions depend on the number of trials n of a binomial experiment and the probability of success p on each trial. under what conditions is it appropriate to use a normal approximation to the binomial?

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)

Which expression is equivalent to 2x^2+7x+4?

Answer question above and explain each step : )