A = 40° (Vertically opposite angles)
b = 180 - 90 - 40 = 50° (Angles in a triangle add up to 180)
c = 180 - 65 = 115° (Adjacent angles on a straight line)
Answer:
The standard deviation is 9.34
Step-by-step explanation:
First we need to find mean of the sample:

Standard deviation will be like below:

How you simplify fractions is figuring out what the highest number that can go into them is.
I now that's a bit confusing but I'll explain.
In this case, 2 can go into both 10 and six, (because 2×5=10 and 2×3=6) and no higher number can, so the simplified version of 6/10 is 3/5. (the numbers we multiplied by 2)
Answer:answer is 100; quadrilateral
Step-by-step explanation:
there are 4 terms since there are 3 signs