Andrew had $250 in his savings account. he then deposits the same amount of money each week for 6 weeks. he deposits twice that amount each week for another 4 weeks. if d is the amount of money andrew deposits each of the first 6 weeks, which expression represents how much money he has in his account after 10 weeks?
a) 250 + d + 4(2d)
b) 250 - d + 4(2d)
c) 250 + 6d + 4(2d)
d) 250 - 6d + 4(2d)

The number of fish in a lake can be modeled by the exponential regression equation y=14.08 x 2.08^x where x represents the year

Hector and alex traded video games. alex gave hector one fourth of his video games in exchange for 6 video games. then he sold 3 video games and gave 2 video games to his brother. alex ended up with 16 video games. how many video games did alex have when he started?

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.