I NEED HELP ASAP

1/3x1/4x0.345x2.0=?

Is the square root of 4 plus the square root of 16 rational?

What is the value of p in the equation y^ = -4x?

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