Read the image attached below

4 and 8

Step-by-step explanation:

(a)

f(0) for x = 0 , that is the interval x < 5, thus

f(0) = x + 4 = 0 + 4 = 4

(b)

f(6) for x = 6 , that is the interval 5 ≤ x < 7, thus

f(6) = 8

x= -3 and

step-by-step explanation:

to find the roots of a cubic, use division or factoring to find the factors then set equal to 0. as this is a difference of cubes, it factors into

where a is the cube root of .

here   this is 27 and the cube root of 27 is 3. so we write using the form:

.

set each factor to 0 and solve for x.

x-3=0

x=3

the quadratic expression does not factor and must be solved using the quadratic formula.

where a = 1, b=3, and c=9

this cubic has two complex roots.

c

step-by-step explanation: