One solution to a quadratic equation is x=-2+14i/2. what is the solution in simplified standard form, a + bi, if a and b are real numbers?

The difference of 2 numbers is 21 and the quotient of the equation is 4 then what are the two numbers?

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

At $1.32 million, they closed last month percent above what they paid in 2007." how much did they pay in 2007?