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What is the solution set of the quadratic inequality x^2-5< or equal to 0

What is the best approximation for the area of a circle with a radius of 4 m ? use 3.14 to approximate pi

Charlie is at an amusement park that has 18 different rides. each ride costs $1.75. the function c(r) = 1.75r represents the total amount of money that charlie will spend if he goes on r rides, but he never goes on the same one more than once. what domain and range are reasonable for the function?