umm i thought i understood derivatives until this

the problem says calculate the derivative indicated...... (d^2y)/(dt^2) | t=1, f(t) = 4t^-3 + 3t^2 the answer in the book says 54....but i do not know how that is

There must be a breach in your understanding....

oh come on !...that's so basic ...

Surely you can't be serious?

I mostly suck at math, but I think that the first derivative is:

the sum of negative twelve "t" to the negative four power and six "t."

The second derivative is:

the sum of forty-eight "t" to the negavtive five power and six.

If "t" is one, then the value of the second derivative is:

48 + 6 = 54.

Nice weather, innit?