Answer:
Step-by-step explanation:
solving for dy/dx
multiply the equation out to remove parentheses
now differentiating in terms of x ()
isolating dy/dx to one side
18 - 7x = -20.5
Subtract 18 from each side:
-7x = -38.5
Divide both sides by -7:
x = -38.5 / -7
x = -5.5 = 5 1/2
The answer is D.
10.78 is the answer.
19.6 x .55