Answer:
k = -2
Step-by-step explanation:
If 
Then

So

From this follows k = -2
Perimeter is all four sides added together, therefore....
38+38= 76
8dm= 80cm
80cm*2=160 cm
76+160= 236<span />
1 month 29 days but if the month have 29 days each then the it will be 2 months
Step-by-step explanation:
The coefficients are 4, 5 and 7
There is no constant
The second one is right