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:
i had done this before so thats your answer, pls follow
Explanatory variable = independent variable = r
Sum is the answer in addition, so add n and 5
n + 5