The exercise is basiacally asking for the perimeter of the garden. The perimeter of a rectangle is twice the sum of its dimensions, so we have

Answer:
46.6 mph
Step-by-step explanation:
1 Kph is .6213 mph
We know the perimeter is the total sum of all sides of the shape, we can use this to form an equation: the perimeter=1st side + 2nd side + 3rd side + 4th side 39a-7=9a+(5a+1)+(17a-6)+4th side.
Collect like terms to get 39a-7=31a-5+4th side
If we move everything but the 4th side over to the left we can solve
C. 8a-2=4th side is the correct answer
Multiply every coordinate by the scale factor 3
(-1,2,0) ----> (-3,6,0) is the answer
Its 7y
hope this helpeddd!