A man buys 4 cows and 9 goats for $50, 150. If he had purchased 9 cows and 4 goats, instead, then he would have to pay $40,750 more. What is the cost of one cow? A. $9,500
B. $11,500
C. $12,000
D. $13,500
E. $1,350

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.

Pls never taught i’m really confused and i rlly need

Which best explains why this triangle is or is not a right triangle ?