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See Explanation

Step-by-step explanation:

We will make use of the following rules in solving these questions:

Inverse Variation: ==>

Direct Variation: =>

Direct, then inverse variation: ==>

Joint Variation: ==>

The solution goes thus:

1. m varies directly to a

2. p varies inversely as q.

3. directly as s and inversely as t.

4. z varies jointly as

5. F varies directly as the

6. d varies jointly r and t

7. P is inversely proportional to h.

8. P varies directly as V

9. d varies directly as the square of  t

10. s varies jointly as  b and d and inversely as the  square L

-13

step-by-step explanation:

f(x)=2x-5 for f(-4)

f(-4)   means let x=-4

f(-4) = 2(-4) -5

f(-4) =-8-5

      = -13