Determine the degree of the function.

a) [[$ f(x) = -3x^2 + 2x - 1 $]]

Answer: The degree is .

b) [[$ f(a) = 6a + 7 $]]

Answer: The degree is .

c) [[$ f(x) = -2x^5 - 6x + 2 $]]

Answer: The degree is .

d) [[$ f(t) = t^4 - 3t^3 $]]

Answer: The degree is .

e) [[$ f(x) = 100 $]]

Answer: The degree is .