68 is the answer to the problem
X is 16 so turn everything into a equation
So you would least the 5 different classrooms temperature from least to greatest to 75°F 76°F 77°F 77°F 78°F And you would technically get 77°F because you took out 75°F and took 78°F and then took out 76°F and took out 77°F and the only number you got was 77°F which is the median. Hope this helps
I'm guessing the second derivative is for <em>y</em> with respect to <em>x</em>, i.e.
Compute the first derivative. By the chain rule,
We have
and so
Now compute the second derivative. Notice that is a function of ; so denote it by . Then
By the chain rule,
We have
and so the second derivative is
If a quadratic equation has solutions and , then we can write it as
So, in your case, we have (let me write 1.5 as 3/2 and -0.25 as -1/4)
If we don't want decimal coefficient, we can multiply the whole expression by 8: