Triangle abc underwent a sequence of transformations to give triangle a'b'c' which transformations could not have taken place?
a
a reflection across the line y = x followed by a reflection across the line ya
b.
a reflection across the x-axis followed by a reflection across the yaxis

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'.