What is square root of 81?? :))

The parabola y = x² - 4 opens: a.) up b.) down c.) right d.) left

Aresearch group wants to find the opinions’ of city residents on the construction of a new downtown parking garage. what is the population of the survey downtown shoppers downtown visitors downtown workers city residents

The radius of a sphere is 3 inches. which represents the volume of the sphere?