Answer:
x = 20
Step-by-step explanation:
The angles are same side interior angles so the add to 180
3x-10 + 5x+30 = 180
Combine like terms
8x +20 =180
Subtract 20 from each side
8x+20 -20 =180-20
8x = 160
Divide by 8
8x/8 =160/8
x = 20
we know that
The sum of exterior angles of any polygon is
degrees
so

therefore
<u>the answer is</u>
the value of x is 
5m the answer because the height of the cone
A)5.17
B)10.86
<em>I hope this helps</em>
Answer:
2bc
Step-by-step explanation:
can't tell how i got it but 2bc is the answer