Answer:
1. option B is correct i.e., 
2. option D is correct i.e.,
.
3. option B is correct i.e.,
.
Step-by-step explanation:
1. Since the given equation is:

As we know that 
So, the given equation can be represented as:

2. Given equation is:

As we know that 
so the given equation can be represented as:
.
3. Given equation is:

by using the properties
,
and 

= 
= 
= 
= 
=
.
which is option B.
Answer:
6
Step-by-step explanation:
Given,
...(i)
Differentiating w.r. to x.

From equation (1)

Now, at the point (1,3)


Answer:
32 years old
Step-by-step explanation:
Reverse what the teacher said. Half 120 to get 60. Subtract 28 from 60. The teacher is 32.
Answer: .
Step-by-step explanation:
Answer:
Third item in the list
Step-by-step explanation:
Third function: f(x) = x + 9. If we substitute 14 for x, we get f(14) = 14 + 9 = 23.