Which figure makes a vertex

Which of the following tables represents exponential functions?

The product of (7x-2) and (20-3x)/4. when x=4

Arandom sample of 45 observations results in a sample mean of 68. the population standard deviation is known to be 23 a. compute the margin of error at a 959% confidence interval. b. compute the 95% confidence interval for the population mean c. compute the 90% confidence interval for the population mean. d. compute the 75% confidence interval for the population mean