1. Dada la función h : (−∞, −1] −→ [−1, +∞)
x 7−→ |2x^2 + x − 1| + x

(a) Determinar si la función es invertible, de serlo obtener su inversa.
(b) Determinar h^−1 ◦ h.​

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?