For this case we have by definition, that the perimeter of the figure will be given by the sum of its sides, that is:

We add similar terms:

Thus, the correct option is option b. That is, 
Answer:

Answer:
X=2
Step-by-step explanation:
20x+40=80
20x+40-(80)=0
20x-40=0 20x=40
x=40/20
X=2
Answer:

Step-by-step explanation:
Our equation is

now we distribute the - and we get


and now we have 
Answer:
$15.88
Step-by-step explanation:
19.99X0.25 = 4.9975
4.9975~5.00
19.99- 5.00
14.99X0.06~ 0.89
14.99+0.89
15.88