13 times an unknown number added 72 equals -23 times the unknown number

X=2

Step-by-step explanation:

Let the unknown number be x

13*x+72=-23*x

13x+72=-23x(collect like terms and add -72 to both sides)

13x+72-72=-23x-72=13x=-23x-72(collect like terms again and add +23x to both sides)

13x+23x=-23x-72+23x=36x=-72

36x=-72(divide both sides by the coefficient of x;36 on both sides)

36x/36=-72/36

X=2.

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'.