There is 180 degrees in a triangle so it is 80 degrees
value of
at x=8 is
.
<u>Step-by-step explanation:</u>
here we need to evaluate 12 + x to the power of 4 - 6 when x = 8 or ,
where x=8 . Let's find out:
⇒ 
Putting x =8 :
⇒ 
Splitting 8 to power 4 into 8 to power 2 ( 2 times )
⇒ 
⇒ 
⇒ 
⇒ 
⇒ 
Therefore , value of
at x=8 is
.
If he wants to have 3 seats more in each row it will go from 18 to 21 to 24 etc. In this case the equation will be y=3x+12
Step-by-step explanation:

X=skirt
y=sweater
z=shoes
x+y+z=165
y=8/7x
z=x+11
plug it in
x+(8/7x)+(x+11)=165
2x+8/7x=154
22/7x=154
x=49
y=56
z=60
a skirt cost $49, a sweater cost $56, and a pair of shoes cost $60