If using the method of completing the square to solve the quadratic equation x^2+15x+7=0, which number would have to be added to "complete the square"?

With: label the vertices and all the elements needed. find x

Which of the statements about the graph of the function y = 2x are true? check all of the boxes that apply. the domain is all real numbers x because the exponent of 2 can be any real number when the x-values increases by 1 unit, the y-value multiplies by 2. the y-intercept is (0, 1). the graph never goes below the x-axis because powers of 2 are never negative. the range is all real numbers.

2.5 milligrams is equivalent to how many grams