数学の問題です。（英語）
数学の問題です。誰か解き方を教えてください。
Question 1
If the average temperature of the earth t years from now is predicted to be T(x)=65-4/t (for t ≥8),find T’(10) and T”(10),and interpret your answers.
Question 2
If $1000 is deposited in a bank paying r% interest compounded annually, 5 years later its value will be V(r)=1000(1+0.01r) ^5 dollars. Find V’(6) and interpret your answers.
Question 3
A company that makes games for teenage children forecasts that the teenage population in the United States x years form now will be P(x)=12,000,000x-12,000x+600x^2+100x^3 Find the rate of change of the teenage population:
a, x years from now.
b, 1 years and 10 year from now and interpret your answer.
