Both the vertical and horizontal cross-section would be a square. The cross-sections are the same because all of a cube's dimensions are the same. A cube is made up of 6 congruent square faces.
Parenthesis
Exponents
Multiplication
Division
Adding
Subtracting
Divide both sides by 2 Since 2 Is multiplying P.
2P-12=p
/ /
2 2
P=6
We have the sample size, sample mean and the sample standard deviation. Since the population standard deviation is not know, we will use t-distribution to find the confidence interval.
The critical t value for 95% confidence interval and 63 degrees of freedom is 1.998.
The 95% confidence for the population mean will be:

Thus, the 95% confidence interval for the population mean will be (115,123)
So, option A is the correct answer
3x + 9y
*Factor out all common factors between the two terms. In this case it is only the number 3.
Therefore your answer will be
3(x+3y)