Answer:
Step-by-step explanation:
example :
2 1/4 + 3 1/2
you can either turn them to improper fractions, find the common denominator, and then add them and then convert that answer to a mixed number
2 1/4 + 3 1/2 = 9/4 + 7/2 = 9/4 + 14/4 = 23/4 = 5 3/4
OR
separate them....add the whole numbers, then the fractions
2 1/4 + 3 1/2 .......2 + 3 = 5.....1/4 + 1/2 = 1/4 + 2/4 = 3/4.....now put them back together and u get : 5 3/4
6.68% of the students scored at least 19 points on this test while the 85 percentile has a test score of 24.08 points
The z score is used to determine by how many standard deviations the raw score is above or below the mean. The z score is given by:

P(x > 19) = P(z > 1.5) = 1 - P(z < 1.5) = 1 - 0.9332 = 0.0668
6.68% of the students scored at least 19 points on this test
b) 85 percentile corresponds to a z score of 1.04

The 85 percentile has a test score of 24.08
Find out more at: brainly.com/question/25012216
The answer is asssociative because you are moving things in The parentheses
Answer:
option C is a the right answer ...
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42x + 4 = 130
42x = 130-4
42x = 126
x = 3