Answer: The wingspan is 36 m.
Using a proportion to solve this, we write the scale factor as a ratio first: 19/38, since 19 is the size of the model's length and 38 is the real length. For the second ratio, we have 18 for the size of the model wingspan and x for the real wingspan:
19/38 = 18/x
Cross multiply:
19*x = 38*18
19x = 684
Z=kx, 30=8k, so k=30/8=15/4 and z=15x/4, so when x=4, z=15.
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The slope is 2.
The slope represents <span>the number of miles hiked every hour.</span>