Someone pls do these two questions for me

Hello!

Here's a break down of 8. and 9.

----------question 8:

For number 8., it asking you what is the sum of the Interior Angles of a polygon with 12 sides.

We know that a dodecagon is a 12-sided polygon with 12 angles and 12 vertices.

We also know that when you add up the angles it needs to equal a number.

When added up all the interior angles (angles within a polygon) of a polygon of 12 sides we get 1800°.

So the answer for 8. is 1800°

--------------question 9:

A quadrilateral has interior angles of 85°, 105°, and 120°. What is the measure of the 4th angle.

Remember that all quadrilaterals have 4 angles that add up to 360°.

So first: Add the given interior angles;

You get: 310

Next subtract the 310° from 360°

You get 50°

The measure of the 4th angle is 50°.

------------------------

I hope this helps you,

Have a great day!!

a) one student is chosen from classroom a, then a student is chosen from classroom b.  

step-by-step explanation:

independent events are ones in which the probability of one event does not affect the probability of the second event.

one student is chosen from classroom a; this does not affect the chances of choosing a student from classroom b.   this makes these independent events.

when one card is chosen from a standard deck and then set aside before a second card is chosen, the probability of the second card being chosen changes.   this makes them dependent events.

when one student is chosen from classroom a and then a second student is chosen from classroom a, the probability of choosing the second student changes.   this makes them dependent events.

when a letter is chosen from the alphabet and then a second letter is chosen, the probability of choosing the second letter changes.   this makes them dependent events.

congruent segments

step-by-step explanation: