What is the result when like terms are combined in the expression 3
a
+
4
d
+
a
+
2
d
?

What is the rotational symmetry of a wheel

2people are trying different phones to see which one has the better talk time. chatlong has an average of 18 hours with a standard deviation of 2 hours and talk-a-lot has an average of 20 hours with a standard deviation of 3. the two people who tested their phones both got 20 hours of use on their phones. for the z-scores i got 1 for the chatlong company and 0 for talk-a-lot. what is the percentile for each z-score?

What is the correlation coefficient between the variables? round to three decimal places. enter your answer in the box