You baked muffins for your class. A dog ate 12 of them. That was 3/10 of the muffins you had. How many did you start with?

40

Step-by-step explanation:

Suppose at the starting, you had "x" muffins.

12=( 3/10 )x  Now let's divide both sides by 3/10

12/ (3/10)=x

12×(10/3)=x

40=x

You originally had 40 muffins.

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'.