Which statement is true about the parts of this expression? 7.5y - z/9 + 50 +2ya) the constant is 7.5.b) the coefficients are 7.5 and  -9.c) the variables are  x  and  y. d) the like terms are  7.5y  and  2y.

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'.