Can some me with this. you have to show your work. 16-19

Have you done any work on these problems yet?  It's unrealistic (and not helpful to you in the long run) to expect someone else to do them for you and to give you the answers.  Still, I will address Problem #16:

Convert    40 yards
               
                   4 sec

to the equivalent speed in miles per hour.  You'll need two of the following three identities:  3 feet = 1 yard; 5280 feet=1 mile; 3600 sec = 1 hour.

Why not reduce this fraction first?  (40 yards) over (4 sec) reduces to 10 yards/sec.

Now convert yards to miles, using 5280 feet = 1 mile and 3 feet = 1 yard.  I see you already have reduced that 40/4 to 10.  Your result should be

10 yards/sec.

Know what to do next?   See my previous paragraph.  Please share your work.