The custodian at Lake High School carries a large key ring. He measures it and calculates that it has a circumference of 31.4 centimeters. What is the key ring's radius?

Which of the following expressions is equal to 2x^2+8

Terri makes a quilt using three sizes of fabric squares the side lenght of each fabric square is the square root of the area

3.17 scores on stats final. below are final exam scores of 20 introductory statistics students. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 57, 66, 69, 71, 72, 73, 74, 77, 78, 78, 79, 79, 81, 81, 82, 83, 83, 88, 89, 94 (a) the mean score is 77.7 points. with a standard deviation of 8.44 points. use this information to determine if the scores approximately follow the 68-95-99.7% rule. (b) do these data appear to follow a normal distribution? explain your reasoning using the graphs provided below.