Which graph represents a function?

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

Select the margin of error that corresponds to the sample mean that corresponds to each population: a population mean of 25, a standard deviation of 2.5, and margin of error of 5%

Rewrite the following quadratic functions in intercept or factored form. show your work. y = 9 + 12x + 4x^2