I know the parabola will open downward because the leading coefficient of the equation, being -5, is negative/less than zero.
-8/5
Remember "rise over run." Rise means the vertical distance and run id the horizontal between the two points.
Answer:

Therefore, option C is correct.
Step-by-step explanation:
We have been given the equation:

We will take LCM 4 on right hand side of the above equation:

Now, we will multiply the 4 in denominator on right hand side to the y in left hand side pof the equation we get:

After rearranging the terms we get:

Therefore, option C is correct.
20%, I believe. The piece of wood lost 2 ounces of moisture after drying, and 2/10 = 20/100