ABC and ACD are both right angled triangles

a. Pythagorous theorem

b. 13.9 cm

Step-by-step explanation:

a. By pythagorous theorem,

   AC = cm = 13 cm

b. By pythagorous theorem,

   AD = cm = 13.9 cm

[If there's any problem with the solution, please inform me]

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'.

step-by-step explanation:

descending order means to order the polynomials from the term with the largest exponent to the term with the smallest exponent.  

therefore, the correct answer is d.