Answer:

Step-by-step explanation:
we are given an algebraic function in x, such that

To find when second derivative >0
For this let us find first and second derivative by successive differentiation.

when ii derivative >0 we have
60x^3-30>0

f"(x)>0 in

Answer: 86
Step-by-step explanation:
The new expression is 4.8d - 4.2c
<u>Explanation:</u>
<u />
Given:
Expression = (-7c + 8d) 0.6
On multiplication we get:
-4.2c + 4.8d
Therefore, the new expression is 4.8d - 4.2c
The probability of it is 2/5