Answer:
150°
Step-by-step explanation:
You are given the formula for the sum of the interior angles where n is the number of sides.
Substitute 12 in:
(12-2)×180
=10×180
=1800
To find an individual angle, divide the sum by n.
1800÷12=150
Answer:
A road with a pitch of 1 in 8 is steeper.
Step-by-step explanation:
Let us convert these to the same units so that we can better compare them.

0.125=12.5 %
As 12.5% is greater than 12%, the road with a pitch of 1 in 8 will be steeper.
Do you have a photo, what tells us that the unknown number is multiplied by 3?