Answer:
BAngle AOB is half as big as angle COB.
Answer:
Three-fifths
Step-by-step explanation:
The picture of the question in the attached figure
we know that
The probability that a randomly chosen point on the grid below is in the blue area is equal to dividing the number of blue squares by the total number of squares
Let
x -----> the number of blue squares
y ----> the total number of squares
so

we have

substitute

simplify

therefore
Three-fifths
Missing step : -3x > 24 <== to get that, 10 was added to both sides
Answer: B) 18
Step-by-step explanation:
The degree of freedom for Standard error or df(Residual) is the sample size minus the number of estimated parameters ,.
df= n - p , where n= sample size , p = number of parameters.
According to the given problem , we have
Sample size : n=20
Number of parameters (x and y ): p= 2
Then, the df value for the standard error of estimate will be :
df= n-p =20-2=18
Thus , the df value for the standard error of estimate is 18 .
Hence, the correct answer is B) 18 .