Answer:
Step-by-step explanation: AB = 28, and AC = 42
Answer:
Root-mean-square (RMS)
Step-by-step explanation:
Arithmetic average is the average of all the values of the surface peaks and valleys.

Root mean square is the root of the sum of the squares of each of the values of the surface peaks and valleys divided by the number of values

where n = the number of values
So, the root-mean-square RMS is always greater than the arithmetic average (AA).
Answer:
Ans is 120
Step-by-step explanation:
25 x 4 is a 100
therefore multiply 4 by 30 to find the 100%
or the ? value that makes the statement true
Ans is 120
Answer:
120°
Step-by-step explanation:
The angle just below 'x' is 40° (alternate angles/parallel lines)
40 + x + 20 = 180 ( straight line)
x = 120°