Differentiate with respect to x and y
2x +10 y y' = 0
get y' alone
y' = -2x/(10 y)
reduce
y'=-x/(5y)
continue with quotient rule of differentiation
y'' = ( 5y(-1) - (-x) (5y')) / (5y) squared
y'' = (-5y + 5xy') / (25y squared)
reduce by dividing each term by 5
y" = (-y +xy') / (5y squared) answer
Now if the teacher wants you to continue so no y or y' shows
substitute y' = -x/(5y) and y = square root ((5-x squared) / 5)
and simplify
<span>The sum of m∠Q and m∠S must be 90 degrees, because the internal angles of a triangle add up to 180 and the right angle is 90 degrees.</span>
They ran 1 and 5/6 miles. This is just under 2 miles, so no, they did not run 2 miles.
The answer is 120°. Hope it helps.
I think your answer might be 19.5