Question 252113
it is a single function,it is defined as such 

a)f(4)

f(x) =  -2x+4  if x less than or equals 1
        3      if 1 < x <4
        x+1    if x is more than or equal to 4

when x=4 f(x) is defined as x+1

so f(4)=5

b)f(-3)

-3 is less than 1

so f(x) = -2x+4

therefore f(-3)=(-2*-3)+4
                =10

c)f(2.7)

1<2.7<4

therefore f(2.7)=3

d)f(-4.9)

-4.9<1

therefore f(-4.9)=(-2*-4.9)+4
                 =9.8+4
                 =13.8
f(-4.9)=13.8