
Let
, so that differentiating both sides wrt
gives

If
and
, the above reduces to

This is the slope of the tangent line, which has equation

Answer:
81:324
Step-by-step explanation:
3+12=15
405 div 15 =27
3 times 27 = 81
12 times 27 = 324
81:324
Firstly, divide 30 by 1425
Then, 1425/30 = 47.5
A Mixed number = A whole number + fraction
Your final answer = 47 1/2 trains
Hope this helps <3 Good luck with future exams!
P.S Fun Fact~~ The Mona Lisa has no eyebrows!