We know that it must equal 9, and that we do x•x-x+6 and find the square root
i) Plan A: 21/0,12 = 175 <min of calls>
Plan B: 15/0,14 ≈ 107 <min of calls>
=> 2 plans cost the same 107 min of calls
ii) The cost when 2 plans cost the same:
- Plan A: 107 × 0,12 = 12,84$ ≈ 13$
- Plan B: 107 × 0.14 ≈ 15$
Answer: i) 107 ii) A: 13$ B: 15$
Answer:
Option b. 12
Step-by-step explanation:
This exercise asks us to find the derivative of a function using the definition of a derivative.
Our function is
. Therefore:


Then:

Expanding:


Now, if x=0:

19 x (12 + 2 + 3) = 323
323 - (2 x 2) - (3 x (14 + 2))
= 323 - 4 - 48
= 271