Answer:
and 
Step-by-step explanation:
First of all, even if the system is of 4th degree, by looking at the shape of the equations I am expecting up to 2 solutions.
The easiest way to solve it, since both equation are in the form y= something, is to equate both RHSs.

which tells us that either
or 
Now we can replace these value of x in one of the two to finish our work: 

Step-by-step explanation:
Opt . C) 40⁰ is the answer .....
L=7+w
P=(12x+14)=2(6x+7)
l+w= P/2 = 2(6x+7)/2= 6x+7
l+w=6x+7
2l = 6x+7
l = (6x+7)/2
l=7+w
-> w= l-7
= [(6x+7)/2] -7
= (6x+7-14)/2
= (6x-7)/2
Answer:
180
Step-by-step explanation:
guessed the answer
that was the easiest
Answer:15
Step-by-step explanation: