Compare the data sets by making two box-and-whisker plots above one number line. grades of class a: 71, 78, 95, 68, 91, 95, 85, 76, 94, 77, 79, 95, 82, 93, 92, 70 grades of class b: 86, 98, 99, 64, 80, 89, 63, 95, 70, 69, 81, 77, 72, 87, 96, 79

Unfortunately, i cannot physically draw a box-and-whisker plot on the computer, but i can explain how.  first, draw a number line and label it so it includes all of your data values.  second, determine the lower extreme. draw a dot above the number on your number line.third, determine the median. draw a dot above the number on your number line.  fourth, calculate the second quartile. after drawing a dot above the number on your number line, draw a short line that goes through your dot and then connect the lower extreme's dot to the second quartile dot. draw a line of the same length through the median and connect the two lines at the top and bottom.fifth, identify the upper extreme and draw a dot above the number on the number line.sixth,  calculate the third quartile. then follow the same steps as with the second quartile.

Associative property and commutative property true for addition, not true for subtraction.

Step-by-step explanation:

Associative property and commutative property true for addition.

i) a + (b + c) = (a + b) + c  ---> Associative property of addition

ii) a + b = b + a --> commutative property of addition.

These properties not true for subtraction.

That's the reason Juan used additive inverse before applying these property.

Hope this will helpful.

Thank you.