I will give brainliest please help!! Solve the top problem

f(4) = 5

Step-by-step explanation:

f(4)  means x=4

Using the function  4 >0 so using the lowest part

x+1  when x>0

4+1

5

f(4) = 5

20. f(4) = 5

21. f(-6) = -6

22. f(0) = 0

23. f(-5) = -5

Step-by-step explanation:

The function is defined differently depending on the interval that x is in.

If x < -6, then f(x) = -2x^2 - 1.          Definition A.

If -6 <= x <= 0, then f(x) = x.            Definition B.

If x > 0, then f(x) = x + 1.                  Definition C.

For each value of the function you are asked to find in questions 20 through 23, the first thing to do is to see in which interval x is. Then you decide which function definition to use.

20. f(4)

4 is in the interval of Definition C.

f(x) = x + 1

f(4) = 4 + 1

f(4) = 5

21. f(-6)

-6 is in the interval of definition B.

f(x) = x

f(-6) = -6

22. f(0)

0 is in the interval of definition B.

f(x) = x

f(0) = 0

23. f(-5)

-5 is in the interval of definition B.

f(x) = x

f(-5) = -5

he spend 5.1 minutes chatting with his friends

step-by-step explanation:

2/5+1/2=9/10

6/1-9/10=5 1/10

75

step-by-step explanation: