14990
1^4 x 9 - 9 = 0
Now, I got 14,000 last time, so I'm going to let someone else get 15,000. But we need someone to interrupt out posts because if it's just you and me I'm gonna get 15,000 AND 14,000 haha
Also, the rate at which we learn this maths is quite quick. We had no idea what rates were and in 50 minutes we had to answer.
"If the volume of a cube is increasing at a rate of 23mm^3/s, find the rate of increase in its surface area when it's side is 140mm"
2 internets for someone who can answer that
