Well, this is my type of answer.
30+60min=90min(history+english)
1/4=maths
3/4=history+english
90min/3=30min(his math homework)
Answer:
1.2x10^-11
You never start with a zero so you move the decimal 11 spots the right which makes it negative
I don’t understand what the question is
Answer: 
Step-by-step explanation:
Regular polygons are those polygons whose sides are equal in length and whose angles are all equal.
By definition each interior angle of a Regular polygon is given by:
(In degrees)
Where "n" is the number of sides of the polygon.
In this case you know that the polygon shown in the picture is a Decagon, which means that it has 10 sides. Then:

Therefore, you must substitute that value of "n" into
and then you must evaluate.
Through this procedure, you get that the measure of an interior angle of the Regular Decagon is:
