For every 4 back handsprings Kayla completed, Rose did 5. If Rose completed 15 handsprings, how many did Kayla complete?

12

Step-by-step explanation:

Since Rose did 15, she did 5 three times. Since Kayla does 4 for every 5 Rose does, she did 4 * 3, or 12 handsprings

Hopefully this helps, let me know if you have any other questions!

a ruler? idk

step-by-step explanation:

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'.