Answer:

Step-by-step explanation:
Using k as the constant of proportionality.
The expression that expresses the relationship : p varies jointly with the square of d and the cube of u.
Varies jointly means that p will change as 'd' and 'u' will change together with respect to their powers.
We get the expression as:

Answer:
8
Step-by-step explanation:
if the 5 aka water is equal to 20, then one unit is equal to 4, and multiply 4 by 2 to get 8.
Pls brainliest
7)X=20
8)X=14
9)X=45.83 repeating
10)X=-19
11)X=100
12)X=-25