Simplify the expression
(-3i) (-4i)

12
-12
12i
-12i

Asimple random sample of size nequals14 is drawn from a population that is normally distributed. the sample mean is found to be x overbar equals 70 and the sample standard deviation is found to be sequals13. construct a 90% confidence interval about the population mean

The hawaiian alphabet has 12 letters. how many permutations are posible for each number of letters?

For what values of the variable x is the expression square root of 7x+14+ square root of 7-x a real number?