What set of numbers doesn't include -5

What statement is true? 2x^2-9x+2=-1

Which of the following exponentially equations is equivalent to the logarithmic equation below?

The distribution of a sample of the outside diameters of pvc pipes approximates a symmetrical, bell-shaped distribution. the arithmetic mean is 14.0 inches, and the standard deviation is 0.1 inches. about 68% of the outside diameters lie between what two amounts?