Answer:
Writing a number in standard form simply means to express the number in its 'normal' form. Therefore, your example is written in standard form.
Answer:
Decagon
Step-by-step explanation:
We can use the general equation to determine the sum of interior angles:

Since we know the sum of interior angles (I.A.) is 1440°, we must figure out n - the number of sides and so:

Since n=10 this means that it is a 10 sided shape meaning it's a decagon.
Answer:
69
Step-by-step explanation: