The sum of two numbers is fifteen. one number is three less than the other. find the numbers.

The answer is 9.

Step-by-step explanation: solve the equation

(x)+(x-3)=15

2x= 15+3

2x=18

2/2x=18/2

x=9

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'.