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2-digit numbers less than 91 which are 1 less than a multiple of 10

Which of the following is the true for f(x) = 5cos

Asquare has a side that measures 11 units. what is the area of a circle with a circumference that equals the perimeter of the square? use 3.14 for π, and round your answer to the nearest hundredth. 1519.76 units2 379.94 units2 616.56 units2 154.14 units2