Systems of equations 1. paco's tacos sold 280 food items from its mobile unit. only tacos ($2 each) and burritos ($3 each) were available. it took in $660 in sales. how many tacos and how many burritos did it sell? 2. penelope printing press promptly sold 5 cent pencils and 10 cent pens to the public. it sold 1000 writing utensils and took in $74.50 in sales. how many pens and how many pencils did they sell?

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'.