Answer: A. 1.2
Step-by-step explanation:
Given : Sample size : n= 64
Standard deviation: 
The formula to find the standard error of mean is given by :-

Therefore, the standard error of the mean= 1.2
Hence, A is the right option.
By definition, a regular polygon is equilateral and equiangular.
Based on that, the sides are congrent and the angles are congruent.
Answer:
answer is c hope this helps can i have branliest
Answer:
x=15
Step-by-step explanation:
21-6=15
-4x+y=-5x-y=15
x+y=-y=15
x=15
Similarly to the last graph that decreased, this one increases, so you have to see where the line points upwards into the right top corner
CD