Answer:

Step-by-step explanation:
A road is perpendicular to a highway leading to a farmhouse d miles away.
An automobile passes through the point of intersection with a constant speed
= r mph
Let x be the distance of automobile from the point of intersection and distance between the automobile and farmhouse is 'h' miles.
Then by Pythagoras theorem,
h² = d² + x²
By taking derivative on both the sides of the equation,




When automobile is 30 miles past the intersection,
For x = 30

Since 
Therefore,


Answer is D because C^2 ×D^2 the * mean ×
The answer to this question is 0.64 because you have to divide hope this helps you
Answer:
Step-by-step explanation:
24-(-18)/(-6)
= 24 - 3
= 21