Identify the surface whose equation is given r^2 + z^2 = 4

The equation describes a circle that gets smaller as z increases, and is maximum size at z=0. The radius of the circle is a maximum of 2, and goes to zero as |z| becomes 2.

The surface is a sphere of radius 2 centered at the origin.

d. millimeters per hour.

step-by-step explanation:

we are given that,

carlo used a rain gauge to measure the amount of water his lawn is receiving from the sprinklers.

since, according to the options, we see that,

water cannot be measured by 'miles per hour', 'meters per second' and 'grams per seconds'.

we get that, the water can be measured by 'millimeters per hour'.

hence, the appropriate rate for describing the amount of water is 'millimeters per hour'.