Answer:
the answer is 12
Step-by-step explanation
first you got to divide the 12 and the 3 which is 4
then you got to add 8 and 22 which would get you 30 and then bring the times 2 down and the multiply it to the 4 which is 8 and then you subtract the 30 and the 8 and then you'll get 12
To check for continuity at the edges of each piece, you need to consider the limit as 
approaches the edges. For example,
has two pieces, 
and 
, both of which are continuous by themselves on the provided intervals. In order for 
to be continuous everywhere, we need to have
By definition of , we have 
, and the limits are
The limits match, so is continuous.
For the others: Each of the individual pieces of 
are continuous functions on their domains, so you just need to check the value of each piece at the edge of each subinterval.
I hope this hepls you
f⁻¹(x)=3x+7
f⁻¹(4)=3.4+7=19
(4/7)^3=.1865
6xyz/2xz simplifies to 3y
