Answer:
The number is 
Step-by-step explanation:
From the question we are told that
The sample size is n = 800
The number of seniors is S = 519
The number of commuters is C = 430
The number of of seniors that are commuters is
Generally the number of 800 surveyed students who were seniors or were commuters is mathematically evaluated as

=> 
=> 
A.
3x+3 (x+y)
distribute what is inside the bracket.
3x + 3x +3y
add the like terms
6x+3y
S is equal to 140. This is because the smallest angle is 60 degrees. The biggest angle is 160 degrees. And 60 + 160 = 220. A circle is 360 degrees. 360 minus 220 equals 140.
9514 1404 393
Answer:
100°
Step-by-step explanation:
Opposite angles in an inscribed quadrilateral are supplementary:
x° +80° = 180°
x° = 100° . . . . . . . subtract 80°