Answer: There are 80 students.
Step-by-step explanation: 20x4=80
3x4=12
12+80=92
Given:
The inequality is:

To find:
The graph for the given linear inequality in the coordinate plane.
Solution:
We have,

The related equation for this inequality is:

The table of values is:
x y
0 3
-1 -2
Plot the points (0,3) and (-1,-2) on a coordinate plane and connect them by a dotted straight line because the sign of inequality is >.
Check the given inequality for (0,0).


This statement is true. So, the shaded area of the given inequality is towards the origin.
Therefore, the required graph is shown below.
Answer:
A. 3
Step-by-step explanation:
angleBOC = 270°
All 3 angles meet at O thus
angleBOC = angle AOC + angle BOD = 120° + 150° = 270°