Which complex number is equivalent to this expression? 7 + (9 + 27i) - 2(25 - 11i) a. 66 - 49i b. -34 + 49i c. -34 + 5i d. 66 + 5i

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.

Can some one explain how to slove specifically, what is the value of x? 0.9(x+1.4)-2.3+0.1x=1.6 enter the answer as a decimal in the box. x= ?

What is the sum of the first 8 terms of the geometric series