Find the solution of 7x = 35, and verify your solution using substitution. a. x = 6; 7(6) = 35, 35 = 35 b. x = –5; 7(–5) = 35, –35 = –35 c. x = 245; 7(35) = 245, 245 = 245 d. x = 5; 7(5) = 35, 35 = 35

Summary statistics given for independent simple random samples from two populations. use the pooled t-interval procedure to obtain specified confidence interval. x1=71.6, s1=3.9, n1=11, x2=67.9, s2=3.4, n2=9 determine a 99% confidence level.