An arithmetic sequence has this recursive formula: (a=7
1er = 8-1-4
What is the explicit formula for this sequence?
O A. an = 7 + (n - 4)(-1)
B. an=-4+(n-1)7
O C. an = 7+ (n-1)(-4)
D. a, = (-1) + (n - 7)(-4)

1. there are 25 students who started computer programming in elementary school and 25 students who started computer programming in middle school. the first group had a mean final project grade of 95% and the second group had a mean final project grade of 92%. the line plot shows the differences after 10 rerandomizations. determine whether the difference in the means of the two groups is significant based on the line plot. explain your answer.

The level of co2 emissions, f(x), in metric tons, from the town of fairfax x years after they started recording is shown in the table below. x 2 4 6 8 10 f(x) 26,460 29,172.15 32,162.29 35,458.93 39,093.47 select the true statement.

What is the number 321,000,000 in scientific notation? also what is the number? ?